3PN01
U
PDATE ON RESOURCES
GALORE CREEK PROJECT, BRITISH COLUMBIA
prepared for:
N
OVAGOLD RESOURCES
INC. AND SPECTRUMGOLD INC.
Suite 3454, Four Bentall Centre
1055 Dunsmuir Street
PO Box 49215
Vancouver, BC V7X 1K8
Prepared by:
Peter A. Lacroix, P.Eng.
A
SSOCIATED MINING CONSULTANTS
LTD.
Suite 300, 4940 Canada Way
Burnaby, B.C.
Canada V5G 4M5
Tel: 604-293-2800 Fax: 604-291-6163
June 3, 2004
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3PN01
U
PDATE ON
R
ESOURCES
G
ALORE
C
REEK
P
ROJECT
,
B
RITISH
C
OLUMBIA
T
ABLE OF CONTENTS
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U
PDATE ON
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ESOURCES
G
ALORE
C
REEK
P
ROJECT
,
B
RITISH
C
OLUMBIA
1
S
UMMARY
Associated Mining Consultants Ltd. (AMCL) and Hatch were retained
by NovaGold Resources Inc. (NovaGold) and SpectrumGold Inc. (Spectrum) to update
mineral resource estimates for the Galore Creek deposit and complete a Technical
Report summarizing the findings of the update to meet the requirements of National
Instrument 43-101 (the Instrument) and Form 43-101F1. The mineral resource study
was a collaborative effort by NovaGold/Spectrum, Hatch and AMCL with Mr. Peter
A. Lacroix, P.Eng. of AMCL directing the work and acting as the Independent
Qualified Person as defined by the Instrument. Mr. Lacroix conducted a site
examination at the property during the week of October 14, 2003.
NovaGold Resources Inc., through its 56% owned subsidiary,
SpectrumGold Inc., is engaged in the exploration of the Galore Creek Project
in British Columbia, Canada. NovaGold has recently made an offer to acquire
the remaining the shares of SpectrumGold and, subject to the satisfactory conclusion
of this transaction, NovaGold will own 100% of SpectrumGold Inc and its interests
in the Galore Creek Project. The Galore Creek deposit is located in a remote
mountainous area approximately 1000 kilometers northwest of Vancouver, 70 kilometers
northwest of the Eskay Creek Mine. The project is located 200 kilometers north
of the tidewater port of Stewart, British Columbia 100 kilometers northeast
of the tidewater port of Wrangell, Alaska. Current access is by helicopter,
although fixed-wing aircraft as well as a combination of barge and road access
have been used in the past to transport personnel and equipment to the site.
Typical of northwest coastal areas of British Columbia, the area is characterized
by cool summers and cold humid winters with relatively heavy snowfall.
The property covers approximately 4,700 hectares and is comprised
of 253 claims and 39 fractions. The claims are wholly owned by Stikine Copper
Ltd. controlled by QIT-Fer et Titane Inc. (55%) and Hudson Bay Mining and Smelting
Co, Limited (45%). In August 2003, Spectrum entered into an option agreement
to acquire a 100% interest in the project by completing a pre-feasibility study
on the project and making payments to the parties totaling US$20.3 million within
a period of 8 years. There will be no retained interests, royalties or back-in
rights on the project.
Mineralization was discovered in Galore Creek in the mid-1950's
and during the subsequent 20 years nearly 75,000 metres of drilling and over
800 metres of tunneling was completed under the direction of Kennco Explorations
and Hudson Bay. Following an economic study prepared in 1974, the project was
relatively inactive until the late
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1980's when both Hudson Bay and Kennecott revisited the project.
This last period of activity added another 20,000 metres of drilling and culminated
with a resource estimate and economic studies from 1992 through 1994. The project
has since been inactive until Spectrum resumed drilling in September 2003.
Galore Creek is a large alkalic intrusive-related gold-silver-copper
system. The property is underlain by volcanic and sedimentary rocks that have
been intruded by an alkali syenite complex. Mineralization is most common in
volcanic rocks and occurs as replacement and disseminated chalcopyrite with
locally abundant bornite.
At least 12 mineralized zones have been identified on the
property. The focus of historic work has been the Central Zone, which is an
area of sulphide replacement in a volcanic rock over an area 1700 metres long,
200 to 500 metres wide and extending to a known depth of 450 metres. Mineralization
is exposed at surface in the southern portion and is overlain by up to 75 metres
of overburden in the north. Grades in the Central Zone often exceed 1% copper
with gold values ranging from 0.3 to in excess of 1 gram per tonne. The other
focus of historic activity has been a near-surface pod of mineralization about
400 metres by 150 metres in area that is approximately 600 metres to the southwest
of the Central Zone. Mineralization in this area, known as the Southwest Zone,
is generally higher in gold content and is in part hosted in a breccia body
which has been interpreted to be a diatreme breccia More recently these zones
have been referred to as the Main and Southwest Deposits however to avoid confusion
this report will retain the original nomenclature.
Numerous other mineralized zones have also received attention
in the past, including a series of flat-lying zones located about 2 kilometers
northwest of the Central Zone. These mineralized zones, which range 50 to 150
metres in width and 460 metres higher in elevation than the Central Zone are
collectively known as the Junction Zones.
Historically, the Central and Southwest Zones have been viewed
primarily as potential open-pit targets while the Junction Zones were envisioned
as moderate-sized underground bulk mining propositions. More recent studies
have focussed on exploiting resources in the Central and Southwest Zones by
surface methods, with production rates ranging from 30,000 to 60,000 tonnes
per day. Commensurate with this emphasis, a number of historic mineral resource
estimates exist, the most recent of which was based on a model completed for
the Central and Southwest Zones in 1992 by Mine Reserve Associates, Inc. (MRA)
on the behalf of Kennecott. That estimate, re-classified in 2002 as indicated
and inferred by Kennecott, totaled 243.2 million tonnes grading 0.75% copper
and 0.45 grams per tonne gold and 70.6 million tonnes grading 0.59% copper and
0.63 grams per tonne gold, respectively. The reporting cutoff was based on an
in-situ metal value of $US10 per tonne using US$0.80 per pound copper and US$320
per troy ounce of gold. The estimate is considered "Historic" under the definitions
of National Instrument 43-101.
Updated estimates for mineral resources contained within the
Central and Southwest Zones were completed by Hatch/AMCL in collaboration with
Spectrum in April 2004.
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These estimates, which incorporate information from the most
recent round of drilling completed in October 2003 as well as having the benefit
of a revised interpretation, are summarized in Table 1. The estimates are based
on a 3-dimensional computer block model with grades interpolated into individual
25 metre by 25 metre by 12 metre high blocks within a geological framework utilizing
ordinary kriging. Specific gravities used for tonnage estimates range from 2.0
for glacial till to 2.49 -2.75 for volcanics and intrusives. The resource estimate
is reported at a block cutoff of 0.5% equivalent copper (Eq Cu).
Table 1 - Mineral Resource Estimates @ 0.5% Eq Cu Cutoff Value
|
Zone
|
Tonnes
(Millions)
|
Grade
|
|
Cu %
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Au G/T
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Ag G/T
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Indicated:
Central
Southwest
Total, Indicated
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251.4
34.5
285.9
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0.75
0.59
0.73
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0.36
1.04
0.44
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5.9
3.7
5.7
|
Inferred:
Central
Southwest
Total, Inferred
|
69.7
29.1
98.8
|
0.61
0.37
0.54
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0.26
0.63
0.37
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5.5
3.3
4.8
|
The resource is reported using copper equivalent cutoff values
that have been calculated by estimating the net smelter return for gold and
silver and allocating the revenue as if it were generated from copper alone.
The selected cutoff of 0.5% equivalent copper (Cu Eq) represents a net value
of about US$10 per tonne based on the assumed prices, metallurgy and smelter
terms. Copper, gold and silver prices used in calculations were US$0.90 per
pound, US$375 and US$5.50 per ounce respectively. Significant quantities of
higher grade resources exist within this inventory however in some cases this
may not represent material which can be exploited without inclusion of some
lower grade resources or internal waste. Further detail with respect to the
distribution of grades and the calculation of equivalent values can be found
in Section 17.10.
It is believed that the stated resource classifications conform
well to the CIM Standards on Mineral Resources and Reserves. The quality and
density of sample information, knowledge regarding the continuity of mineralization
within various geological units as well as any limits that the structural framework
has imposed on the resource have all been considered carefully in setting the
guidelines. The Central Zone is drilled from surface down to about 450 metres
depth on an approximate spacing of 50 to 100 metres north-south and 50 metres
east-west. Below this, as well as on the extremities, the drill density is much
less. This change in drilling density coincides roughly with the change in classification
from indicated to inferred. While the drill spacing in Southwest Zone is substantially
less, the density is still sufficient near surface and at the core of the deposit
to allow approximately 60% of the tonnage to be classified as indicated. The
geological and structural framework has served to limit the extent of each category
further.
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None of the mineral resource is classified as measured. It
is believed that in addition to reducing the overall drill spacing to that recommended
in Section 17.8, more extensive sampling of precious metals and confirmation
through further testing will be required to warrant upgrading any portion of
the resource to measured. There has been no mining experience with the deposit
and it would be premature to assume that the level of confidence associated
with "measured" can be applied to these mineral resources without further work.
While necessary to formulate detailed mine plans for production, it is not recommended
that any additional drilling be completed within the area of the indicated mineral
resource to upgrade it to measured. A limited surface program designed to upgrade
inferred resources along the peripheries of the existing zones as well as determine
their vertical and strike extent could be considered as an addendum to the recently
completed program.
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2
I
NTRODUCTION AND
T
ERMS
OF
R
EFERENCE
NovaGold Resources Inc. (NovaGold), through its 56% owned
subsidiary, SpectrumGold Inc. (Spectrum), is engaged in the exploration and
advancement of the Galore Creek Project in British Columbia, Canada. Associated
Mining Consultants Ltd. (AMCL) and Hatch were retained by NovaGold and Spectrum
to update mineral resource estimates for the Galore Creek deposit and complete
a Technical Report summarizing the findings of the update to meet the requirements
of National Instrument 43-101 (the Instrument) and Form 43-101F1.
The purpose of the study is to provide a current foundation
for further work on the property, including a preliminary assessment of the
project's economic potential and development alternatives as well as assist
in the refinement of its exploration and delineation efforts and technical programs
for the 2004 field season. The Technical Report will also serve to provide regulators
and investors with a formal and up-to-date reference for the property that incorporates
the results of the most recent work program completed by Spectrum in October
2003.
A site visit and detailed examination of the property was
conducted by Mr. Lacroix on October 15 and 16, 2003 with Mr. Greg Johnson, Vice
President Corporate Communications for NovaGold, in attendance. He gratefully
acknowledges the assistance of Mr. Johnson and the project site personnel in
this effort, including Mr. Jim Muntzert, Project Manager. During the site visit,
sufficient opportunity was available to examine logging procedures and drill
core from the 2003 program as well as conduct a general overview of the property,
including selected drill sites and historic core, and the condition of existing
project infrastructure. Based on his experience, qualifications and review of
the site and resulting data, the author of this report, Mr. Lacroix, is of the
opinion that the programs have been conducted in a professional manner and the
quality of data and information produced from the efforts meet or exceed acceptable
industry standards. It is also believed that for the most part, the work has
been directed or supervised by individuals who would fit the definition of a
Qualified Person in their particular areas of responsibility as set out by the
Instrument.
The resource study was a collaborative effort by Spectrum,
Hatch and AMCL with Mr. Peter A. Lacroix, P.Eng. of AMCL directing the work
and acting as the Independent Qualified Person as defined by the Instrument.
While actively involved in the preparation of the resource estimates, Mr. Lacroix,
Hatch and AMCL had no direct involvement or responsibility in the collection
of the data and information or any role in the execution or direction of the
work programs conducted for the project on the property or elsewhere. The updated
mineral resource estimates are based on the most recent interpretations by project
staff coupled with other data and reports provided by Spectrum. Much of the
data, including the drill assay and geological database upon which the estimate
is based, has undergone thorough scrutiny by project staff as well as certain
data verification procedures by the author. In addition to the supplied data,
the author has also had the benefit of the aforementioned site visit and detailed
collaboration with project
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staff and their consultants. Scott Petsel, Jack Cote and Robert
Prevost of NovaGold/Spectrum are thanked for their contributions to this effort.
Much of the information and data upon which the estimates
provided in this report are based have been obtained from the files and databases
of Kennecott Canada Inc. Where appropriate, references for this information
as well as other sources are provided in Section 21.
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3
D
ISCLAIMER
This report was prepared for Spectrum by the independent firms
of Hatch and AMCL and is based in part on information not within their control.
While it is believed that the information contained herein will be reliable
under the conditions and subject to the limitations set forth herein, Hatch
and AMCL do not guarantee the accuracy thereof. In particular, while the author
has performed certain requisite data verification procedures, the volume of
geological and sample data is such that 100% verification would preclude timely
and cost effective completion of the study. Consequently, a certain reliance
upon data, information and reports provided by others is necessary, although
it is believed, for the most part, that this information has been prepared under
the direction or supervision of individuals believed to be "Qualified Persons"
as defined in the Instrument.
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4
P
ROPERTY
D
ESCRIPTION
AND
L
OCATION
The Galore Creek property is located in mountainous terrain
of northwestern British Columbia, approximately 1,030 km northwest of Vancouver
and 90 km northeast of Wrangell, Alaska (Lat. 57.13°N; Long 131.47°W)
. The claims lie at the headwaters of Galore Creek, a tributary of the Scud
River, which flows into the Stikine River. The property is centered at latitude
57° 07'30"N and longitude 131°27'W. It occurs within the Liard Mining
Division and straddles the boundary between NTS map sheets 104G/3 and 104G/4.
The claims that cover the property are wholly owned by Stikine
Copper Ltd. This company was incorporated in 1963 and is presently controlled
by QIT-Fer et Titane Inc (55%) and Hudson Bay Mining and Smelting Co, Limited
(45%). The property comprises 253 claims and 39 fractions for a total of 292
two-post claims covering approximately 4,700 hectares. SpectrumGold has recently
acquired additional claims in the Galore Creek property area through staking,
purchase, and option agreements. A total of 16,850 hectares (42,000 acres) of
claims have been staked by Spectrum in the area to the southeast and east of
the Galore Creek property. SpectrumGold has also acquired 100% interest in the
Jack, Sphaler Creek, Paydirt and Copper Canyon properties which cover a total
area of 1,725 hectares (8,550 acres). In addition Spectrum has entered into
an option agreement with Pioneer Metals Corporation. on the Grace property contiguous
with the Galore Creek Claims to the north. Spectrum has also entered into an
option agreement with Eagle Plains Resources Ltd. on the Copper Canyon property
to the east. Collectively, these claims cover a total of 4,275 hectares (10,600
acres). Figure 2 illustrates the claim boundaries for the original claims of
the Galore Creek property held by Stikine Copper Ltd.
A reclamation permit (MX-1-351) and a $100,000 bond for the
Galore Creek property was previously posted by Kennecott and is presently in
place. Asset Liability Management Group (ALM Group) and AMEC carried out an
assessment of the existing liability at the Galore Creek property in the fall
of 2003. As a result of this assessment, SpectrumGold presently has a $428,000
bond in place for the Galore Creek property that covers the reclamation costs
for the property and the exploration program planned for the 2004 field season.
This bond and 2004 work will be carried out under the British Columbia Mineral
Exploration, Activities and Reclamation Permit (MX-1-608) issued to SpectrumGold.
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In 1969, two map reserve permits were granted to Stikine Copper
by the B.C. government. Notation of Interest Number 85742 covers an area of
approximately 1,060 hectares in the vicinity of the Anuk and Stikine Rivers
and was established due to its importance as potential mill site, tailings disposal
and town site. A second Notation of interest (Number 886067) was established
to protect the most viable access route from Galore Creek to the Stikine River
(Scud Airstrip). These reserves do not give the owner any exclusive rights to
the areas but simply ensure that Stikine Copper will be informed of any other
applications for land alienation. Both these permits have been renewed at various
times and are presently extended until further notice from the Skeena Regional
Office of Land and Water Management. A large no-staking reserve was granted
by the Ministry of Energy, Mines and Petroleum Resources in 1968 to cover a
tract of land extending from the Galore Creek claims to the Stikine River. This
was requested by Kennco (Stikine) Mining Ltd. for prevention of nuisance staking
over a proposed tunnel access route to the property. In March 1989, this was
amended to a "Conditional Reserve" where staking was permitted but claim holders
could not interfere with any tunnel or underground workings created by previous
mineral title holders.
The project falls within the boundaries of the Cassiar Iskut-Stikine
Land and Resource Management Plan (LRMP) which was finalized in May 2000. The
approved plan supports further exploration and development of the areas mineral
resources by providing information to be considered during the permitting and
impact assessment processes. The LRMP is primarily in territory claimed by the
Tahltan First Nation. The Tahltan Joint Councils, representing the Tahltan Band
from Telegraph Creek and the Iskut Band, were full table members throughout
the process and endorsed the LRMP. Neighbouring First Nations include the Nisga'a,
Kaska, and Tlingit Nations.
The LRMP identifies 15 geographic resource management zones,
covering 31% of the plan area. One of these, the Lower Stikine-Iskut Grizzly
Salmon Management Zone, includes the valley of the Stikine River from the Chutine
confluence to the US border, and the lower Iskut River west of the Craig River.
It also includes the Scud River into which Galore Creek drains. Mineral exploration
and development are accepted activities within the Coastal Grizzly/Salmon Management
Zone, including road access where needed. Adjacent areas includes an operating
mine (Eskay Creek), a number of past producers including the recently closed
Snip mine, two projects in the Environmental Assessment Process (mine development
review phase), and a number of other exploration prospects. Logging is only
allowed for the purposes of mineral exploration and/or mine development and
for localized use.
The Galore Creek claims fall within the broader traditional
territory of the Tahltan First Nation as registered in their Statement of Intent
(SOI) area through the treaty process. Mining has long been an important segment
of the Tahltan economy. Men from Telegraph Creek and Iskut were trained by professional
geologists to work as prospectors during the initial exploration of the area
by helicopter in the late 40s and 50s. Tahltans also worked in the asbestos
mining town of Cassiar, north of Dease Lake, from construction through mining
to shutdown. As well, the Tahltans participated in the exploration, construction,
operations and reclamation of the recently closed Golden Bear
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Mine, also north of Dease Lake. The largest mining operation
in the area at present is the Eskay Creek gold mine located 80 kilometres southeast
of Galore Creek. Approximately 35% of the Eskay Creek work force (including
contractors) are First Nations people. The Tahltan Nation has the road maintenance
and catering contracts at Eskay.
In 1992 Kennecott conducted an inventory of the camp and it
was cleaned up in preparation for a period of inactivity. Other work included
reclamation of roads and drill pads built for the 1991 exploration program.
In 1999 Kennecott retained Norecol Dames and Moore (NDM) to conduct a site inspection
to assess reclamation requirements and costs. Water draining from the Central
Zone adit was tested and found to contain metal concentrations well below the
Contaminated Sites Regulation Aquatic Life (CSR AW) standards. The portal site
was heavily overgrown and showed signs of collapse within. It was recommended
that all adit entrances be sealed.
In 1999, the Ministry of Energy, Mines & Petroleum Resources
requested a reclamation bond of $100,000 be placed on the property in order
to permit any further exploration work. The amount of the bond was based on
costs of reclaiming the camp site, airstrips and previous exploration activity.
In September 2002 Keewatin Consultants conducted a site visit
to assess environmental liabilities. Items noted included leakage from bulk
fuel storage tanks and fuel drums near the camp area, a scrap metal site approximately
750 metres south of the camp and numerous empty fuel drums around the Portal
airstrip.
In August 2003, SpectrumGold entered into an option agreement
to acquire a 100% interest in the project by completing a pre-feasibility study
on the project and making payments to the parties totaling US$20.3 million within
a period of 8 years. Payments of US$0.3 million in aggregate are required over
the first three years of the option, with the remaining US$20 million to be
paid over the following 5 years. There will be no retained interests, royalties
or back-in rights on the project
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5
A
CCESSIBILITY
,
C
LIMATE
,
L
OCAL
R
ESOURCES
,
I
NFRASTRUCTURE
AND
P
HYSIOGRAPHY
The property is located approximately 200 kilometers north
of Stewart B.C. and 96 kilometers northeast of Wrangell, Alaska the two closest
communities with tidewater facilities. The town of Smithers, 370 kilometers
southeast, is the nearest major supply centre and has an airport with regularly
scheduled flights to and from Vancouver.
Galore Creek and the Scud River are part of the tributary
system of the Stikine River, an international waterway that drains an area of
49,000 square kilometers. In the past the river was used by shallow draft barges
and riverboats to transport goods from Wrangell, Alaska to Telegraph Creek,
British Columbia, a distance of 302 kilometers. The river is navigable for this
type of watercraft from mid May to October. The nearest point on the Stikine
River to the property is the mouth of the Anuk River, which lies 16 kilometers
west of the camp.
Helicopter is the present means of access to the Galore Creek
property. A 500-meter gravel airstrip is located on the property but will require
repair for use by aircraft with short take-off and landing capabilities. A second
airstrip at the mouth of the Scud River has been utilized in the past for aircraft
up to the size of a DC-3 and would also require repair for use.
The Bob Quinn airstrip on the Stewart-Cassiar Highway is located
approximately 75 kilometers east of Galore Creek and was the staging area for
the 1991 project mobilization and demobilization.
In the 1960's Kennecott constructed 48 kilometers of road
from the mouth of the Scud River to the Galore Creek camp. This road would require
repair along the Scud River and portions of the Galore Creek Valley for use
by the project.
Galore Creek is located in the humid continental climate zone
of coastal British Columbia and is characterized by cool summers and cold humid
winters, with several months of snow cover. Summer temperatures may be above
+20°C and minimum winter temperatures may fall to well below -20°C.
Average annual precipitation is 76 cm with approximately 70% of this falling
between September and February, mainly as snow.
Elevations on the property range from 500 to 2080 metres above
sea level. The terrain over the central and northern portions of the property
is gentle and rolling and the surrounding topography is characterized by rugged
mountains. The elevation of the tree line is variable but alpine vegetation
predominates above the 1100-meter level. Below that, forests are made up of
Balsam fir, Sitka spruce and a few cedars. Higher up the valley, the moraines
are bare to sparsely overgrown by sub-alpine vegetation.
The project is currently isolated from power and other public
infrastructure. Sufficient space is available on site for the various facilities
required for a mining operation,
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including personnel housing, stockpiles and process facilities.
Ample water supply is available from surface and subsurface sources.
6
H
ISTORY
Mineralization was first discovered in the upper Galore Creek
valley in 1955 by M. Monson and W. Buchholz while prospecting for Hudson Bay
Exploration and Development Company Limited. Staking and sampling were completed
in the area in 1955. Work in 1956 included mapping, trenching and diamond drilling.
No further work was undertaken and most of the claims were allowed to expire.
In 1959 reconnaissance stream silt surveys were carried out by Kennco Explorations (Western) Limited in the Stikine River area. Results from this work prompted Kennco to stake mineral claims the following year around the remaining 16 claims owned by
Hudson Bay. Four of the original claims were subsequently optioned by Consolidated Mining and Smelting Company of Canada Limited from W. Buchholz. Late In 1962 the three companies agreed to participate jointly in future exploration work. As a
result, Stikine Copper Limited was incorporated in 1963.
Work conducted since discovery in 1955, outlined a significant
gold-silver-copper resource in the Central Zone and identified a number of satellite
deposits of which the most important are the Southwest Zone and two deposits
known as the North Junction and Junction Zones.
From 1960 to 1968, the property was operated by Kennco Explorations
(Western) Ltd. Exploration work during this period included 53,164 metres of
diamond drilling in 235 holes and 807 metres of tunneling in two adits. The
Central Zone was the focus of most of this work. No work was done from 1968
to 1972. In 1972, Hudson Bay Mining and Smelting became operator and in 1972
and 1973 an additional 25,352 metres of diamond drilling was completed in 111
holes. This work focused exclusively on blocking out resources in the Central
and North Junction zones. A further 5,310 metres of diamond drilling was completed
in 24 holes in 1976. In 1989, Mingold Resources Inc. (an affiliated company
of Hudson Bay's) operated the property in order to investigate its gold potential.
Mingold drilled a further 1,225 metres in 18 holes during 1990. Kennecott resumed
operatorship of the project in 1991 and completed 13,830 metres of diamond drilling
in 49 holes. An airborne geophysics survey and over 90 line kilometers in an
induced polarization (IP) survey were also completed. The other eleven mineral
occurrences on the property are: Junction, North Junction, West Rim, Butte,
Southwest, Saddle, West Fork, South Butte, South 110, Middle Creek and North
Rim.
Table 2 summarizes the work performed during past exploration
programs.
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6.1
Historical Resource Estimates
A mineral resource estimate was prepared by Mine Reserve Associates,
Inc. (MRA) for Kennecott Corporation in 1992 and included both the Central and
Southwest Zones. This study, entitled "Pre-feasibility Mining Evaluation Galore
Creek Project" reported a Proven and Probable reserve' of 342.5 Million
Tonnes grading 0.64% Cu and 0.38 g/t Au. A further 105.7 Million tonnes grading
0.46% Cu and 0.44 g/t Au was classified as Possible'. This resource was
used as the basis for several subsequent pit designs with strip ratios ranging
from 1.5:1 to 2.2:1. MRA's scope of work did not include check assay analysis
or geological interpretation.
In November of 2002, Kennecott re-classified the mineral resource
to comply with current industry reporting standards. Economic parameters used
were a US$10/tonne in situ metal value as a cutoff grade based on US$0.80/lb
Cu and US$320/oz Au prices. Model blocks were classified as indicated'
if at least 5 composites were used in the interpolation and the closest composite
was within 60 metres of the block centroid. All other estimated blocks were
assigned to the inferred' category. Results are summarized in the following
table:
Table 3
- Historic Mineral Resource Estimate
Galore Creek Kennecott 2002
Indicated Mineral Resource
|
|
Million
|
Cu
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Au
|
|
Zone
|
tonnes
|
%
|
g/t
|
|
Central
|
209.4
|
0.77
|
0.36
|
|
Southwest
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33.8
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0.59
|
1.05
|
|
Combined
|
243.2
|
0.75
|
0.45
|
Inferred Mineral Resource
|
|
Million
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Cu
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Au
|
|
Zone
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tonnes
|
%
|
g/t
|
|
Central
|
39.6
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0.73
|
0.36
|
|
Southwest
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31.0
|
0.42
|
0.95
|
|
Combined
|
70.6
|
0.59
|
0.63
|
Silver was not included in the 1992 resource model but earlier
resource estimates from the 1970's reported grades ranging from 6.8 to 7.5 g/t
for the Central Zone at corresponding copper grades of approximately 1%.
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7
G
EOLOGICAL
S
ETTING
7.1
Regional Geology
The Galore Creek deposits lie in Stikinia Terrane, an accreted
package of Mesozoic volcanic and sedimentary rocks intruded by Cretaceous to
Eocene plutonic and volcanic rocks. The eastern boundary of the Coast Plutonic
Complex lies about 7 kilometers to the west of the claims. The property lies
within a regional transcurrent structure known as the Stikine Arch.
Stikine Terrane at this latitude can be grouped into four
tectonostratigraphic successions. The first and most important one in this area
is a Late Paleozoic to Middle Jurassic island arc suite represented by the Stikine
assemblage of Monger (1977), the Stuhini Group (Kerr, 1948) and Hazelton Group
equivalent rocks. The other successions are: Middle Jurassic to early Late Cretaceous
successor-basin sediments of the Bowser Lake Group (Tipper and Richards, 1976);
Late Cretaceous to Tertiary transtensional continental volcanic-arc assemblages
of the Sloko Group (Aiken, 1959); and Late Tertiary to Recent post-orogenic
plateau basalt bimodal volcanic rocks of the Edziza and Spectrum ranges.
The oldest stratigraphy in the area is known as the Stikine
assemblage and comprises Permian and older argillites, mafic to felsic flows
and tuffs. These rocks grade upward into two distinctive Mississippian limestone
members separated by intercalated volcanics and clastic sediments. The topmost
stratigraphy consists of two regionally extensive Permian carbonate units that
suggest a stable continental shelf depositional environment. The Middle to Upper
Triassic Stuhini Group unconformably overlies the Stikine assemblage. Stuhini
Group rocks comprise a variety of flows, tuffs, volcanic breccias and sediments,
and are important host rocks to the alkaline intrusive-related gold-silver-copper
mineralization at Galore Creek. They define a volcanic edifice centered on Galore
Creek and represent an emergent Upper Triassic island arc characterized by shoshonitic
and leucitic volcanics (de Rosen-Spence, 1985), distal volcaniclastics and sedimentary
turbidites. The succession at Galore Creek was divided by Panteleyev (1976)
into a submarine basalt and andesite lower unit overlain by more differentiated,
partly subaerial alkali-enriched flows and pyroclastic rocks.
A fault-bounded wedge of unnamed Jurassic sediments unconformably
overlies the Stuhini Group rocks. Within this unnamed Jurassic succession is
a basal purple to red polymictic boulder and cobble conglomerate with an arkosic
matrix. It contains granitic clasts including distinctive K-spar porphyries
that are Galore Creek syenite equivalents.
Three intrusive episodes have been recognized in the region.
The earliest and most important is the Middle Triassic to Middle Jurassic Hickman
plutonic suite that is coeval with Upper Triassic Stuhini Group volcanic flows.
The Mount Hickman batholith comprises three plutons known as Hickman, Yehino
and Nightout. The latter two are exposed north of the map area. The Schaft Creek
porphyry copper deposit is associated
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with the Hickman stock, and is located 39 km northeast of
Galore Creek. This stock is crudely zoned with a pyroxene diorite core and biotite
granodiorite margins. Alkali syenites of the Galore complex like those found
at the nearby Copper Canyon deposit and the pyroxene diorite bodies of the zoned
Hickman pluton have been interpreted as differentiated end members of the Stuhini
volcanic - Hickman plutonic suite by Souther (1972) and Barr (1966). The alkali
syenites are associated with important gold-silver-copper mineralization at
Galore Creek and at Copper Canyon. These rocks are believed to be at least as
old as Early Jurassic in age, based on K-Ar dating of hydrothermal biotite in
the syenites intruding the sequences (Allen, 1966). An Ar-Ar age of 212 Ma (Logan
et al., 1989) in syenite may give the time of crystallization of the intrusive
rocks at Copper Canyon, to the east of Galore Creek. More recent U-Pb dates
of Galore Creek syenites have given ages ranging from 205-210 Ma (Mortensen,
1995).
Coast Range intrusions comprise the large plutonic mass west
of the map area. Three texturally and compositionally distinct intrusive phases
were mapped by previous workers. From inferred oldest to youngest, they are
K-spar megacrystic granite to monzonite; biotite hornblende diorite to granodiorite;
and biotite granite. Small tertiary intrusive stocks and dykes are structurally
controlled in their distribution. At Galore Creek young post-mineral basalt
and felsite dykes are abundant as a dyke swarm in the northwest part of the
property. Elsewhere, Tertiary intrusions may be important in their association
with small gold occurrences.
The regional geology has been affected by polyphase deformation
and four main sets of faults. The oldest phase of folding is pre-Permian to
post-Mississippian and affected the Paleozoic rocks between Round Lake and Sphaler
Creek. This deformation is characterized by bedding plane parallel foliation
in sediments and fragment flattening in volcaniclastics. Pre-Late Triassic folding
is characterized by large, upright, tight to open folds with north to northwest
trend of axial plane traces and westerly fold vergence. Metamorphism accompanying
the first two phases of deformation reached greenschist facies. The third phase
of folding is manifested as generally upright chevron folds with fold axes pointed
west northwesterly.
The oldest and longest-lived fault structures in the area
have a north strike and subvertical dip. The best example occurs on the west
flank of the Hickman batholith, where a major fault juxtaposes Permian limestone
with a narrow belt of Stuhini Group volcanics. The second important fault type
occurs at Copper Canyon as a west directed thrust fault with a north strike
and east dip of 30 to 50 degrees. It juxtaposes overturned Permian limestone
and Middle Triassic shale with Stuhini volcanics below. Early to Middle Jurassic
syenite intrusions occupy this contact. A third important set of faults with
northwest strike mark the boundary between Upper Triassic and Paleozoic rocks
between Scud River and Jack Wilson Creek. The youngest faults have a northeast
strike direction and are of great local importance. At Galore Creek, some of
these faults show considerable post-mineral movement of up to 200 metres while
others appear to control the emplacement of mineralized intrusive phases and
breccia bodies.
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7.2
Property Geology
The Galore Creek property is mainly underlain by volcanic
and sedimentary rocks of the Middle to Upper Triassic Stuhini Group. They are
intruded by an Alkali Syenite complex composed of multiple intrusions emplaced
into volcanic rocks of similar composition. The complex is centered in the west
fork of Galore Creek and is 5 km in length and 2 km in width. To date, twelve
gold-silver-copper mineralized zones have been identified on the property. The
mineralization is most common in highly altered volcanic rocks and to a lesser
degree in syenite intrusions.
7.2.1
Volcanic Rocks
Volcanic rocks host the bulk of the mineralization at Galore
Creek and have been subdivided into six units.
7.2.1.1
Augite-Bearing Volcanics (V1)
A heterogeneous sequence of augite bearing mafic flows, flow
breccias and volcaniclastics are interbedded with pseudoleucite volcanic rocks
in the northern portion of the Central Zone. Rare bedding is preserved in lapilli
tuffs of this unit and graded bedding is locally preserved. These rocks generally
host only weak to moderate mineralization in comparison to the pseudoleucitebearing
rocks.
Augite-bearing flows contain porphyritic and, infrequently,
amygdaloidal textures. Augite phenocrysts vary in size from 2-5 mm and are generally
euhedral to subhedral, stubby and dark green to black. They comprise up to 30%
of the rock and are supported in a medium to dark green, aphanitic groundmass.
The augite phenocrysts are usually altered to biotite, epidote and chlorite.
Locally, strong garnet-biotite-orthoclase alteration is also observed. Interbedded
with the augite bearing flows are augite-bearing volcaniclastics in the form
of fine and coarse lapilli tuffs, tuff breccias and flow breccias containing
subangular to subrounded fragments of augite porphyry. These volcaniclastics
are generally matrix supported.
7.2.1.2
Pseudoleucite-Bearing Volcanics (V2)
Pseudoleucite-bearing trachytes occur as moderately west dipping
sequences interbedded with augite bearing units, intermediate and lesser mafic
volcanic rocks. The original textures are often obliterated by intense orthoclase
and sericite alteration. Copper/gold mineralization appears to occur preferentially
in these rocks.
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In unaltered areas, euhedral and broken pseudoleucite phenocrysts
up to 1.5 cm occur within a bluish grey to salmon pink groundmass. These phenocrysts
often exhibit orthoclase-sericite altered cores. Rims are sometimes altered
to sericite, magnetite and chlorite.
In the Central Zone, fragments of pseudoleucite bearing volcanic
rocks are seen as fragments in mineralized hydrothermal breccias containing
abundant garnet.
7.2.1.3
Orthoclase-Bearing Volcanics (V3)
Orthoclase-bearing volcanics are predominantly fine and coarse
crystal lithic tuffs with possible subordinate flows and are common in the southern
part of the Central Zone, where they crop out on surface and are often seen
in drill core. In this area, they are often strongly mineralized with disseminated
bornite, chalcopyrite and gold. They appear to be cogenetic and coeval with
dark syenite porphyry intrusives, which may be their subvolcanic equivalents.
The crystal fragments in the tuffs are broken orthoclase shards
up to 7 mm across supported by a highly altered biotite-orthoclase +/- garnet-anhydrite
matrix. Rare bedding is preserved locally.
7.2.1.4
Undifferentiated Volcanics (V4,V5,V6)
In some areas, intense alteration has obliterated original
textures resulting in the more vague classification of "undifferentiated volcanics".
Such rocks have been classified on the basis of colour and association.
Mafic volcanic rocks (V4) are dark green, chloritic flows
and tuffs common in the north part of the Central Zone. These are interbedded,
and may, in part, be correlated with unit V1 (augite-bearing volcanics). Porphyritic
and amygdaloidal flow textures have been preserved locally and volcanic clasts
are sometimes preserved in pyroclastic rocks.
Intermediate volcanic rocks (V5) are very common in the Central
Zone. These rocks are medium greenish grey volcaniclastics and flows, and may
be aphyric equivalents of the pseudoleucite bearing volcanic units. Included
in this unit are possible trachy-andesites containing subrounded orthoclase
phyric fragments. Aphanitic volcanic clasts up to 3 cm across have also been
observed within a fine grained to aphanitic matrix. Secondary biotite occurs
both as a spotted to patchy alteration and as coarse aggregates an veins.
Intense orthoclase flooding has resulted in pale grey, felsic
volcanic rocks (V6) which are fine to medium grained volcaniclastics and flows.
V6 rocks are present in the north and central part of the Central Zone, often
interbedded with pseudoleucite volcanic rocks that may be their equivalent.
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7.2.2
Sedimentary Rocks
Sedimentary rocks consist mainly of interbedded siltstone,
argillite, greywacke and conglomerate and are most common immediately to the
north of the Central Zone. The large amounts of volcanic and subordinate intrusive
material in these rocks indicate a volcanic-intrusive source.
Sedimentary structures such as graded bedding, flame structures
and channel scour features have been observed in drill core north of the Central
Zone, from outcrop in North Rim Creek, and more rarely in drill core from the
Central Zone. Where observed in outcrop, tops indicators show the sequence is
right side up.
7.2.2.1
Conglomerate (S1)
Conglomerates are common north of the Central Zone, in North
Rim Creek and North Rim Zone, and in the North Junction Zone. The unit is heterolithic
and unsorted. Fragments are subrounded to rounded, matrix supported by sand
and silt sized grains. Fragments of volcanic and syenitic rocks are present
and comprise up to 30% of the rock. Conglomerate contains local intercalations
of argillite and greywacke. Channel scours and load casts are common.
7.2.2.2
Greywacke (S2)
Grey-green, poorly sorted, medium to coarse grained greywackes
are common north of the Central Zone, in North Rim Creek. They also appear rarely
in drill core within the Central Zone as intercalations with lapilli tuffs.
This unit is locally very well bedded and graded. Fragments of argillite and
volcanic material are subangular to subrounded.
7.2.2.3
Siltstone (S3)
Siltstone is fine to medium grained, grey, massive to well
bedded and locally contains graded bedding.
7.2.2.4
Argillite (S4)
Argillite occurs as alternating medium to dark grey and black,
aphanitic, well bedded sequences. Beds vary in thickness from 0.5 to 1 cm. Local
flame structures have been observed, particularly in North Rim Creek and in
the 2070 Adit in the Central Zone, where it is interbedded with siltstone (S2).
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7.2.3
Intrusive Rocks
Multiple intrusive phases are present in the complex and divided
into pre, inter, late and post mineralization phases. This classification is
based on crosscutting relationships along with the degree of alteration and
mineralization characteristics. Based on recent U-Pb age dating (Mortensen et
al, 1995), the probable crystallization ages range from 210 ± 1 Ma for
a syn-mineral intrusion (I4) immediately south of the Central zone, to 205.0
± 2.3 and 205.0± 1.8 for post-mineral intrusions (I9b). These
results indicate that the magmatic activity continued for a period of at least
1.6 Ma. and that mineralization occurred at an early stage.
Petrologic examination (Enns et al, 1995) has shown that the
Galore Creek intrusive rocks contain variable proportions of orthoclase, plagioclase
(oligoclase or albite), pseudoleucite, melanite, clinopyroxene, biotite and
hornblende phenocrysts in a matrix of pilotaxitic K-feldspar, disseminated magnetite,
apatite and titanite.
Early intrusive units (I1 through I5) consist of K-feldspar
and pseudoleucite porphyritic dikes and sills. These are followed by relatively
equigranular intrusions (I6 and I8), K-feldspar porphyritic and megaporphyritic
units (19b-I11), and a relatively equigranular intrusion (I12). This apparent
oscillation between porphyritic and equigranular textures may reflect variations
in the volatile fugacities of the melts.
The modal change in the primary mineral assemblage of the
Galore Creek intrusions, from syenitic to monzonitic, back to syenite and finally
to quartz syenite, suggests differences in the compositions of the parent melts.
7.2.3.1
Pre-Mineralization Intrusions (Units
I1 to I3)
These early intrusives are pre-mineral and include thin pseudoleucite
porphyry dikes (I2), and syenite porphyry. Medium-grained syenite porphyry with
prominent pseudoleucite megacrysts is present as an elongate body centered on
the Central Zone as well as within the North Junction Zone. The Central Zone
intrusion extends for at least 1500m north-south, 500 metres east-west and constitutes
a west-dipping body. It is closely associated with the most intense hydrothermal
alteration and may represent the causative intrusion for the main stage Cu-Au
mineralization.
7.2.3.2
Inter-Mineralization Intrusions (Units
I4a & I4b)
Relatively small bodies of inter-mineralization porphyry are
present in association with the Central and Junction-North Junction Zones in
close proximity to the pre-mineralization porphyry intrusions. These porphyries
have been termed "dark syenite porphyry" due to the dark colour of the groundmass
resulting from the presence of magmatic and hydrothermal biotite. Several inter-mineralization
porphyry phases are
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present, the earlier ones carrying significant gold-silver-copper
mineralization. Orthoclase megacrysts are ubiquitous, occasionally accompanied
by pseudoleucite.
7.2.3.3
Late-Mineralization Porphyries (Units
I5 to I12)
Dikes and/or sills of late-mineralization porphyries intrude
the Central and Junction/North Junction zones and may also constitute a large
stock between these zones. These phases are easily recognized because of the
lack of mineralization and the propylitic alteration assemblage. The most common
phases are grey equigranular to porphyritic, medium-grained syenite (I8), megaporphyry
(I9a & b), grey medium grained syenite porphyry (I11a) and lavender porphyry
(I12). Minor phases include dikes and small stocks of fine-grained syenite and
syenite porphyry (I6 & I7), plagioclase syenite porphyry (I10) and medium-grained
syenite porphyry (I11). Most of these late minor phases were defined from drill
core in the Central zone. Minor mineralization associated locally with these
dikes suggests that they are either syn-mineral, or minor late mineralization
was introduced with them.
The lavender porphyry (I12) is a quartz-bearing syenite that
occurs as a small body near the centre of the complex. It intrudes a late-mineral
breccia exposed in Dry Creek and is locally mineralized with chalcopyrite.
7.2.3.4
Post mineral dykes
Fine grained, mafic to felsic post mineral dykes occur mainly
as steep to vertical, north-south and east-west trending bodies. Rarely, they
have sub-horizontal attitude. The ages of these dykes are undetermined but thought
to be related to the Coast intrusions of mid-Mesozoic to Tertiary age.
7.2.4
Breccias
Both hydrothermal (orthomagmatic) and diatreme (phreatomagmatic)
breccias occur in the deposit areas. They are distinguished mainly by the fragment
shapes and types, nature of matrix, alteration assemblages and the presence
or absence of altered and mineralized clasts.
7.2.4.1
Diatreme Breccias
The Southwest Zone is hosted by an unbedded, polylithologic,
matrix-supported breccia that is interpreted tentatively as the fill of a phreatomagmatic
diatreme. Clasts include a variety of altered and/or mineralized lithologies
including some that are copper bearing, indicating that some mineralization
events preceded brecciation. The breccia matrix is
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rich in rock flour but also appears to contain comminuted
crystals of possible tuffaceous origin.
A dark-coloured, unbedded breccia lacking obvious mineralized
clasts occurs at several locations in the Central and Junction-North Junction
zones. There is a possibility that this rock of volcaniclastic origin but the
most likely interpretation is a facies of the diatreme breccia.
7.2.4.2
Orthomagmatic breccias
Several, relatively small bodies of orthomagmatic (magmatic-hydrothermal)
breccia carrying gold-silver-copper mineralization were emplaced during the
latter intrusive phases of the system. Breccia bodies south and west of the
Central Zone carry clasts of propylitized, late-mineralization mega-syenite
porphyry. The breccias are mainly clast-supported and characterized by a matrix
of magnetite accompanied by one or more of epidote, garnet, pyroxene and biotite.
One of the most prominent breccias at Galore Creek is exposed
in lower Dendritic Creek on the west side of the Central Zone. This breccia
is pervasively altered and mineralized and grades into the highly altered I3
intrusion and adjacent pseudoleucite-phyric volcanic rock. This close spatial
association with the early I3 intrusion suggests that this breccia formed early
in the main stage of mineralization.
Other orthomagmatic breccias include the mineralized Saddle
Zone breccia and the West fork breccia. The latter was found to contain clasts
of unaltered intrusive phases including I11, suggesting that it formed late
in the intrusive sequence.
7.2.5
Alteration Assemblages
7.2.5.1
K-Silicate Alteration
The dominant alteration assemblage at Galore Creek is K-silicate,
which affects the volcanics, pre- and inter- mineralization porphyries, and
to a minor extent, post-mineralization porphyries. The most intense K-silicate
alteration is found in the pre-mineralization porphyry stock and comprises K-feldspar,
biotite, magnetite, anhydrite, bornite and chalcopyrite. K-silicate alteration
is notably weaker in the inter-mineralization porphyries although biotitization
of the diatreme breccia is intense.
Within the core region of the Central Zone, an associated
"Ca-K-silicate" assemblage is developed, characterized by the addition of a
dark brown garnet with locally occurring diopside, epidote and plagioclase.
This alteration likely occurred when the same K-silicate altering fluids encountered
more calcic mafic rocks, derived excess Ca and precipitated garnet. The decreasing
Ca component in the alteration from the core region
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to the north and south regions of the Central Zone is accompanied
by generally increasing magnetite and early hematite.
7.2.5.2
Calc-Silicate Alteration
A calc-silicate assemblage dominated by diopside and pale
brown garnet replaces one or more fragmental horizons in the footwall of the
pre-mineralization porphyry stock. This assemblage is considered to constitute
prograde skarn and is metal-poor unless overprinted by hydrothermal biotite.
In the Central Zone, cross cutting relationships with the K-Silicate assemblage
and lack of mineralization indicates that this alteration is very late in the
sequence.
7.2.5.3
Intermediate Argillic Alteration
Intermediate argillic alteration appears to be most intense
in the upper exposed parts of the pre-mineralization intrusion and often overprints
K-silicate alteration with green sericite, carbonate and minor chlorite. Pre-existing
magnetite is altered to hematite and much of the sericite is developed at the
expense of hydrothermal biotite. Sericite alteration affects all the volcanic
units, the pre- and, to a lesser extent, post-mineral porphyries. The paragenetic
relationship of the alteration assemblages suggests that the intermediate argillic
alteration was largely post mineral but prior to the intrusion of the post mineral
porphyries.
7.2.5.4
Sericite-Anhydrite-Carbonate (SAC)
Sericite-anhydrite-carbonate (SAC) alteration overprints the
dominant early alteration phases and is locally extensive. In the southern part
of the Central Zone it is accompanied by late hematite. In the northern portion
it is marked by increasing pyrite ± hematite and decreasing bornite-chalcopyrite,
suggesting that copper was remobilized during SAC alteration. In the core of
the Central Zone, SAC alteration is patchy and more common on the periphery.
The later hydration of anhydrite to gypsum by groundwater action and consequent
volume increase has resulted in intense sheet fracture development in parts
of the Central Zone to depths of as much as 213 metres below surface. The gypsum
has been leached out to depths ranging from 30 to 122 metres leaving loose crumbly
sheets of rock. The sheet fractures are best developed in volcanic rocks and
weak to absent in the porphyries.
7.2.5.5
Propylitic Alteration
An epidote-chlorite assemblage, locally accompanied by garnet,
is present in the late-mineralization mega-porphyries and penetrated for a few
metres into their wall rocks.
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7.2.6
Structure
The Galore Creek intrusive complex is believed to represent
an eroded volcanic centre. Syenite sheets are subvolcanic intrusions, the extrusive
equivalents of which may be the orthoclase-bearing tuffs and pseudoleucite lavas.
The two main structural elements are faults, which offset
and segment intrusive bodies, and a subhorizontal fracture cleavage. Faults
are abundant in the Central Zone, but displacements on most of them appear to
have been small. An exception is a major post-mineralization west-dipping fault
east of the Central Zone that has an apparent normal displacement of up to 300
metres. Significant displacement might have occurred on faults in the northern
part of this zone but it has been difficult to correlate marker beds and dykes
between drill holes.
A north-trending mylonite zone at least 100m in thickness
is exposed in volcanic rocks along the west margin of the intrusive complex.
The zone dips 42° to the west and predates mineralization and alteration
in upper Butte Creek.
A major east-west regional structure, marked by a prominent
aeromagnetic linear, lies parallel to lower Dendritic Creek. This feature cuts
through the Central Zone where it is occupied by a late-mineral 19b-megaporphyry
dike at section 6773N.
A series of northeast-striking faults from extend from east
of the Southwest zone, northward beyond the boundary of the claims. The long
axes of both early porphyry I3 and the breccia in lower Dendritic Creek are
aligned parallel to this trend suggesting a common regional structural control.
This fault system intersects the east trending linear described above near the
core of the Central Zone.
Post-mineralization, sub-vertical dikes and felsic dike swarms
occupy east-trending structures of probable Tertiary age.
The terms "sheet fractures" and "fracture cleavage" are applied
to a set of near-surface, closely spaced subhorizontal fractures. These are
attributed to expansion resulting from the hydration of anhydrite by meteoric
waters.
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8
D
EPOSIT
T
YPES
The Galore Creek deposit is classified as an alkalic intrusive
related gold-silver-copper deposit. These deposits occur throughout the length
of Stikinia Terrane in Upper Triassic Nicola-Takla-Stuhini volcanic rocks and
comagmatic alkaline plutons. Deposits of this class include Afton, Mount Polley,
Copper Mountain and Lorraine. They typically occupy brecciated and faulted subvolcanic
zones in the intrusions and country rocks that are overprinted by extensive
potassium, propylitic and pyrometasomatic alteration zones. International examples
of this type of deposit include the OK Tedi mine in Papua New Guinea, Candelaria
in Chile and the deposits of the Cadia Hill district in Eastern Australia.
9
M
INERALIZATION
Mineralization at Galore Creek occurs in upper Triassic felsic
to intermediate volcanic flows and fragmental rocks. It is associated most closely
with intense, pervasive K-silicate alteration as replacement, disseminated and
fracture-controlled chalcopyrite with locally abundant bornite. Higher gold
values are normally associated with bornite mineralization.
9.1
Central Zone
The Central Zone is the largest and most extensively explored
of all the deposits and is characterized by fairly complex geology. Mineralization
is exposed in the southern part of the zone, but elsewhere it is covered by
up to 75 m. of glacial overburden. Between 80% and 90% of the gold-silver-copper
occurs as sulfide replacement of the host volcanic rocks. The grade of the mineralization
commonly exceeds 1% Cu decreasing rapidly at the margin of the zone.
The Central Zone deposit has an orientation of 015° and
dips steeply to the west. It is 1700 metres. long, 200 to 500 metres wide and
has been traced to a depth of 450 m and remains open. The eastern boundary of
the Central Zone mineralization lies near the surface projection of a major,
steeply west dipping, brittle normal fault. In the west and south, mineralization
is truncated by post-mineral megaporphyry dykes. Intense SAC alteration has
obliterated mineralization in the northwestern part of the Central Zone. In
the north, mineralized volcanic rocks end abruptly against a thick sequence
of weakly to unmineralized epiclastic sedimentary and volcanic rocks.
The Central zone exhibits considerable internal variations
in both mineralization and alteration. Hydrothermal alteration changes from
Ca-K-silicate in the core region to intense K-silicate alteration toward the
north and south parts of the zone. In terms of gold-silver-copper replacement
mineralization, the most favourable volcanic lithologies are the pseudoleucite-bearing
volcanic rocks in the north and the dark crystal tuffs in the
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south. Augite-bearing units in the north are low to moderate
in copper content and the core of the deposit hosts a mineralized orthomagmatic
breccia. Gold values are highest in the northern and southern portions of the
Central Zone where significant disseminated bornite, magnetite and hematite
are present. Lower gold grades correlate with the intense Ca-K-Silicate altered
core region. Chalcopyrite is the most important copper mineral and occurs as
replacements, disseminations and fracture fillings throughout the zone. Supergene
copper mineralization is minor and occurs primarily as malachite, azurite and
chrysocolla on fractures within 60 metres of surface. Pyrite increases in abundance
to the east of the Central Zone reaching concentrations of up to 5%.
9.2
Southwest Zone
The Southwest Zone is located about 600 metres southwest of
the south end of the Central Zone and contains some of the highest grade near
surface gold mineralization. Kennecott envisioned the southwest area as a potential
high-grade starter pit. Drilling has outlined an elongate pod shaped body that
trends roughly east-west and dips approximately 60° to the south. The zone
is up to 400 metres long and may be as wide as 140 metres; however, the 1991
drilling suggests that the zone narrows at both the eastern and western ends
of the deposit. The Southwest Zone is still open at depth. Primary hosts for
the Southwest mineralization are a diatreme breccia and an early syenite phase
intrusive. Localization of high-grade gold-silver-copper mineralization within
the diatreme appears to relate to a combination of structural traps and mineralizing
faults.
9.3
Junction Zones
The Junction and North Junction deposits lie about 2 kilometers
northwest of the Central Zone and about 460 metres higher in elevation. They
are a series of irregular, flat-lying manto-shaped bodies plunging about 20°
to the northeast. Together these two zones are interpreted to have been a single
deposit that was originally 1400 metres in length before it was faulted. Width
of the zones varies from 50 to 150 metres. The mineralization, consisting of
disseminated chalcopyrite and bornite, is hosted by fine to coarse lapilli tuff
and feldspar phyric flows. Higher gold and copper grades correlate with the
presence of bornite in the North Junction zone. K-silicate alteration consisting
of pervasive hydrothermal biotite and K-feldspar flooding is associated with
the mineralization. A large mass of late-mineral I9b megaporphyry truncates
the zone on the west.
9.4
Other Zones
A number of smaller gold-silver-copper showings occur in the
claim group but have had only limited exploration work.
The Butte and West Rim deposits lie along the western margin
of the Galore Creek complex. Both host NE-striking, west-dipping zones of disseminated
chalcopyrite and
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bornite. At the Butte zone, mineralization is hosted by K-silicate
altered pseudoleucite-bearing volcanics. At surface, mineralization grades up
to 2.18% copper and 0.5 grams gold per tonne across 96.6 metres. The zone is
truncated at depth by post-mineral (Ill) intrusions. Drilling in 1964 on the
West Rim showing intersected 48.8 metres grading 0.8% copper. This zone is hosted
by volcanic tuffs with intense K-Silicate alteration and is truncated at depth
by I9b megaporphyry intrusions.
Between 1963 and 1991, ten holes were drilled in the North
Rim Zone located about 1600 metres north northwest from the Central Zone. Here,
a broad area of widespread weak copper mineralization was discovered in outcrop
and subsequent exploration revealed coincident copper-gold geochemical and chargeability
anomalies. Two holes intersected zones of low grade copper (0.3 -0.4%) over
widths of 21-24 metres with accompanying gold grades up to 0.5 grams per tonne.
The last two holes intersected many narrower (<10m) intervals grading 0.3
-1.0 grams gold per tonne and one as high as 6.34 grams per tonne over 3 metres.
Spotty copper grades above 0.3% were also present. The area is underlain mainly
by intrusive phases cut by small orthomagmatic breccia bodies with magnetite-rich
matrix and Ca-K-Silicate alteration.
Field mapping in the Middle Creek area in 1991 re-located
mineralization reported by previous prospectors in the mid 1960's. This area
lies about 1 kilometer west of the Central Zone. Mineralization consisted of
finely disseminated bornite, chalcopyrite and magnetite associated with pervasive
fine-grained biotite and garnet in an altered, intermediate tuffaceous unit.
Only one drill hole was completed and it intersected 63 metres grading 0.42%
copper and 0.07 grams gold per tonne. The zone is apparently constrained by
late megaporphyry intrusions (I9b), lavender porphyry (I12), and the large diatreme
breccia in upper Dendritic Creek.
The Saddle Zone lies 2.6 kilometers southeast of the Central
Zone and is hosted by a breccia dominated by a matrix of magnetite. Four holes
were drilled here between 1954 and 1963 and two more added in 1990. The later
holes intersected two 12 metre zones of mineralization grading 0.55% copper
and 2.19 grams gold per tonne, and 2.49% copper and 3.98 grams gold per tonne,
respectively. Three of the older holes also intersected low to moderate copper
and high gold grades (between 1.0 and 6.9 g/t Au) but gold analyses were incomplete.
An adjacent showing named the South 110 zone is possibly a continuation of the
Saddle Zone to the north.
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10
E
XPLORATION
10.1
Geochemistry
Regional stream silt geochemistry was instrumental in the
discovery of the mineralization at Galore Creek and more detailed silt sampling
programs were carried out in 1960-61 and 1989.
A significant area of the property lacks sufficient soil development
for soil geochemistry to be of any practical use. Soil grids were established
in the areas around the North Rim and Southwest zones. A few reconnaissance
traverse soil lines were also sampled along contour between the Saddle Zone
and the Central Zone.
In 1991, 600 soil samples were collected from a grid established
in the North Junction / North Rim area. Samples were taken on 20-meter stations
along lines spaced 100 metres apart. A coincident Cu-Au soil anomaly with peak
values of 9060 ppm copper and 550 ppb gold was located over the North Rim showing
area. A total of 63 surface rock chip samples were also collected from various
showings on the property.
10.2
Geophysics
Various ground and airborne geophysical programs have been
carried out on the property. In 1961 H.W. Fleming of Toronto conducted a vertical
magnetic field survey over 22 square kilometres on a line spacing of 800 feet
(244m). The same year an airborne magnetic survey was carried out by Aero Surveys
Limited over an area of 64 square kilometres using 270-meter line spacing.
Between 1961 and 1963, McPhar Geophysics Ltd. carried out
pole-dipole resistivity/IP, VLF and AFMAG surveys over an area of 20 square
kilometers with line spacing of 122 and 244 metres. Dipole lengths used were
30, 60 and 120 metres.
In 1991, Aerodat Limited conducted an airborne geophysical
survey including magnetics, EM, radiometrics and VLF over an area of 35 square
kilometers using a line spacing of 100 metres east-west and 150 metres north-south.
Also in 1991, Lloyd Geophysics was engaged to carry out a combination of pole-dipole
resistivity/IP, VLF and Total Magnetic surveys over an area of 5.5 square kilometers
on lines spaced 100 metres apart with a 60 metre dipole spacing.
Both of the airborne surveys mapped three principal features;
two large magnetic highs separated by a broad magnetic low. The largest magnetic
high occupies the northwest quarter of the claim block and is coincident with
a broad area of syenitic intrusive rocks. This feature is elongated in a north-northeast
direction with dimensions of 4.5 by 2.0 kilometers. Although the 1991 survey
showed a singular large high, it also revealed
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numerous magnetic highs and lows which probably reflect the
complex poly-phase nature of the intrusives. The second major magnetic high
occurs in the southeast portion of the claim block roughly coincident with the
intrusive rocks around the Saddle Zone. The magnetic low defined by both surveys
lies within the central portion of the claim block and is coincident with an
area of volcanic rocks. The low is elongate along the same north-northeast trend
as the intrusive rocks.
The 1991 airborne survey revealed a set of prominent magnetic
lineaments oriented N20°E. This direction is roughly parallel to the mineralization
in the Central, Butte, Junction, West Rim, and North Junction zones. This set
of lineaments also parallels two mapped faults associated with the east side
of the southern Central Zone and one of these lineaments coincides with the
west boundary of the Central Zone. Other significant magnetic lineaments are
oriented east-west and N60°W. The former set appears to represent early
structures based on observed segmentation and offset by later structures and
obliteration by intrusive activity.
Airborne EM data reveal clusters of negative in-phase responses
with a small out-of-phase component that correlate directly with mineralization
at the Southwest Zone and in the southern half of the Central Zone. Similar
responses were found lateral to mineralization at the Junction zones, the North
Rim zone and the northern half of the Central zone. Nearly all the discrete
conductors identified with the airborne EM occur within the Galore Creek drainage
and are not likely related to massive sulfide mineralization. The survey also
identified many narrow dike-like zones which are interpreted to be magnetite
bearing structures.
The airborne radiometrics showed enhanced potassium levels
over most known deposits, which was not unexpected due to the prevalence of
potassic alteration associated with the copper mineralization. Inman (1992)
recommended further processing and modeling of element ratios in order to remove
the effect of vegetation and soil moisture content.
Results of the early IP surveys suggested that the mineralized
zones did not respond well to IP. However, reprocessing of the data by Inman
(1992) indicated that the core of the Central Zone exhibited a metal and resistivity
high signature while the peripheral clay/argillic alteration zones showed a
metal and resistivity low signature. The important geophysical characteristic
of known mineralization within the Galore Creek area were summarized by Inman
as follows (in order of importance):
-
Moderate-strong IP response (characteristic of all known deposits that
were surveyed)
-
Within a magnetic low but close to a steep magnetic gradient (may indicate
volcanicrocks near intrusive contact)
-
Near a N20°E magnetic lineament
-
Near other magnetic lineaments, especially E-W lineaments
-
Coincident radiometric potassium anomaly
Based on these criteria it was concluded that the Butte and
North Rim zone area had the highest potential for extensions of known mineralization
(Figure 7)
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10.3
Underground Development
In order to extract a 50-ton bulk sample for pilot plant testing,
an adit was driven into the Central Zone and samples were collected from four
crosscuts. The work was carried out by Haste Mine Development between August
1966 and January 1967 and totaled 799 metres of underground drifting (2mx2m).
The rock quality in this part of in the Central Zone was found to be generally
weak and intensely fractured in gypsum-free areas, but tough and competent in
zones of gypsum cementation.
Seven underground diamond drill holes were collared from the
2070 adit. Severe recovery problems were encountered because the holes were
of small diameter and drilled sub parallel to the flat-lying, sheet fractures.
No assay data was located for these holes.
Sampling of the adit and drift walls was carried out over
continuous horizontal 3 metre (10 ft) intervals plus vertical channels alongside
the traces of diamond drill holes. Although commonly referred to as "channel"
samples, one internal memo described them as "contentious (sic) chip samples".
The vertical samples taken adjacent to the drill hole traces correlated within
0.1% copper. When compared to horizontal samples on the opposite side of the
drift, significant variation was found in higher-grade areas (>1.5% Cu) where
massive blebs of chalcopyrite were encountered. In these areas variations often
exceeded 0.4% copper for opposing walls. Subsequent check sampling along some
of the same channels confirmed this variation.
At the North Junction Zone, a smaller adit (1.2mx2.1m or 4'x7')
was collared in badly fractured and altered tuff. After driving through 26 metres
of material grading about 0.5% copper, a low-grade dike was encountered. Total
length of the adit was 51 metres.
11
D
RILLING
11.1
Past Drilling Programs
Since initial discovery in 1960, there have been 439 diamond
core holes drilled on the property. As shown in the following figure and table,
most of this work has focused on the Central Zone, with lesser amounts of work
on eleven other areas. Some zones have received only reconnaissance drilling.
During the 1970's drilling was principally confined to the
Central Zone with nine holes drilled on the North Junction Zone. In the Central
Zone average core recovery was between 75% and 85% with the poorest recovery
at depths between 60 and 90 metres, where the open sheet fractures were encountered.
At depths below 90 metres core recovery approached 100%. In the North Junction
zone recovery averaged around 60%
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due to shattered and sheared sections encountered both near
surface and at intervals throughout the holes.
In 1989/1990, Mingold drilled holes on the Southwest Zone
(8 holes, 1026 m.), the North Rim showing (6 holes, 546 m.), the Saddle Zone
(2 holes, 226 m.) zones and 2 reconnaissance holes.
The 1991 program was mainly directed at areas peripheral to
the Central Zone as well as exploration holes located in the Southwest, Butte,
North Rim and Dry Creek zones. Only 6 holes were drilled within the Central
Zone itself.
Table 4 - Summary of Pre 2003 Drilling Programs
|
|
No. of
|
Total
|
|
Deposit/Area
|
Holes
|
metres
|
|
|
|
|
|
Camp IP
|
1
|
122
|
|
Butte
|
5
|
1281
|
|
Saddle
|
6
|
667
|
|
North Rim
|
10
|
1264
|
|
West Fork
|
10
|
1,504
|
|
Southwest
|
32
|
6,147
|
|
North Junction
|
45
|
10,183
|
|
Reconnaissance
|
51
|
9,230
|
|
Central
|
279
|
67,855
|
|
|
|
|
|
Total
|
439
|
98,253
|
11.2
2003 Drilling Program
During 2003, Spectrum completed an 8-hole 2,800-meter drill
program to verify previous results and better understand deposit variability,
zonation and controls for mineralization. Particular emphasis was directed at
understanding the gold variability in the deposit. The number, length and location
of the holes completed during the 2003 program are listed in Table 5. In addition,
2 holes were lost in overburden and not completed.
Table 5 - 2003 Drilling Program
|
Deposit/Area
|
No. of
|
Total
|
|
|
Holes
|
metres
|
|
Central - North Gold
|
3
|
1,322
|
|
Central -Replacement
|
2
|
612
|
|
Central - South Gold
|
1
|
459
|
|
Southwest - Breccia
|
2
|
401
|
|
Total
|
8
|
2,794
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All 8 diamond core holes were angle drilled in order to intersect
the mineralized structures as close to right angles as possible. The 6 holes
within the Central Zone were all drilled toward the east and focused on the
gold rich lenses at the north and south peripheries of the zone, and the higher-grade
central copper replacement zone. The 2 remaining holes were drilled in the Southwest
Zone. These holes were angled towards the north.
Drill hole 441 was targeted to test both an upper mineralized
horizon and the potential for a lower mineralized zone. The hole successfully
intersected the upper horizon as well also encountering a new mineralized horizon
not tested in previous drilling. This lowermost horizon totaled 65 metres in
width before the hole ended. The hole ended in well mineralized material. Table
6 provides a summary of the most significant mineralized intercepts encountered
in the 2003 program.
Table 6 -
Significant Intercepts, 2003 Drilling
|
ID
|
From
|
To
|
Width
|
Copper
|
Gold
|
Silver
|
|
|
m
|
m
|
m
|
%
|
g/t
|
g/t
|
|
DH-436
|
27.1
|
176.0
|
148.9
|
0.70
|
1.86
|
5.2
|
|
including
|
38.7
|
66.0
|
27.3
|
1.54
|
2.20
|
6.8
|
|
DH-437
|
15.6
|
180.0
|
164.4
|
1.16
|
1.52
|
8.5
|
|
including
|
21.3
|
94.0
|
72.7
|
2.15
|
2.64
|
16.4
|
|
DH-438
|
130.0
|
204.0
|
74
|
0.89
|
0.37
|
7.3
|
|
including
|
158.0
|
184.0
|
26
|
1.19
|
0.44
|
10.2
|
|
DH-438
|
258.0
|
326.0
|
68
|
1.48
|
0.31
|
11.3
|
|
including
|
262.0
|
284.0
|
22
|
2.72
|
0.53
|
17.3
|
|
DH-439
|
148.0
|
262.60
|
114.6
|
1.17
|
1.98
|
9.4
|
|
including
|
216.0
|
248.00
|
32
|
2.07
|
2.82
|
11.6
|
|
DH-440
|
-
|
-
|
-
|
-
|
-
|
-
|
|
DH-441 (1)
|
41.6
|
200.3
|
158.7
|
1.10
|
0.79
|
7.9
|
|
including
|
111.9
|
142.0
|
30.1
|
2.34
|
1.41
|
13.4
|
|
DH-441 (2)
|
394.0
|
459.3
|
65.3
|
1.20
|
0.23
|
10.8
|
|
including
|
428.0
|
459.3
|
31.3
|
1.68
|
0.27
|
14.0
|
|
DH-442 (1)
|
170.5
|
356.0
|
185.5
|
0.81
|
0.88
|
4.0
|
|
including
|
200.0
|
223.4
|
23.4
|
1.02
|
1.72
|
4.7
|
|
DH-442 (2)
|
260.0
|
308.0
|
48.0
|
1.19
|
1.00
|
5.1
|
|
DH-443
|
-
|
-
|
-
|
-
|
-
|
-
|
|
DH-444
|
128.0
|
212.0
|
84.0
|
0.67
|
1.10
|
4.3
|
|
including
|
152.0
|
172.0
|
20.0
|
1.18
|
2.81
|
7.8
|
|
DH-445
|
26.0
|
149.0
|
123.0
|
2.09
|
0.28
|
17.4
|
|
including
|
97.5
|
134.1
|
36.6
|
3.59
|
0.50
|
24.0
|
Note:
Holes 440 and 443 were lost in overburden.
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12
S
AMPLING
M
ETHOD AND
A
PPROACH
12.1
Past Programs
Drill core in mineralized zones was generally sampled in 3-meter
(~10 foot) intervals. In some areas where lithologic and/or mineralogical changes
occurred, narrower assay intervals were employed. Intervals not sampled were
mainly comprised of late stage, post-mineral dykes. The samples were tagged
then split in half using a mechanical splitter. One half of the core was returned
to the core box and the other either processed on site or shipped to an outside
laboratory for analysis. The core returned to the boxes remains on site as a
record of the hole. Pulps and rejects were stored either on site, in a warehouse
in Smithers or in Vancouver. Those pulps and rejects remaining on site are in
degraded sample bags and are not considered worth salvaging.
Core has been stored in either plastic, galvanized steel or
wooden boxes. All have been marked with metal tags inscribed with the hole number
and interval. An estimate 1,500 metres. of core was spilled in 1972 due to the
collapse of a core storage rack. In the winter of 1976 one core shed collapsed
and although most of the core was rescued, a number of intervals were not salvageable.
Core from the Central Zone was largely re-logged as part of the 1991 exploration
program. It is now stacked in pallets exposed to the elements and the top layers
have suffered deterioration from weathering. Several intervals have also been
removed in the past for the purposes of metallurgical testing. Other intervals
have been quartered for check assaying.
No site-specific standards, blanks or field duplicate samples
were used in any of the previous exploration programs. During the most 1991
program, every twentieth sample was re-assayed by an umpire laboratory while
the main assay laboratory performed internal checks.
12.2
2003 Program
All drill core from the 2003 program, excepting intervals
of overburden and till material, were sampled to create a complete geochemical
profile of the drill hole. Drill core sampling occurred within a minimum of
1-metre (3.2 feet) and a maximum of 3-metre (10-feet) intervals. Drill core
in mineralized intervals was generally sampled in 2-metre (~6.5 feet) intervals.
In obviously unmineralized sections, core was sampled in 3-metre intervals.
Variation from the prescribed sample length resulted when sample breaks were
marked at observed lithologic, mineralogic and major structural changes in the
core.
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All core samples were tagged by the geologist that logged
the hole. Photographs of the core were taken prior to splitting for analysis
to provide a permanent record. All the drill core samples were split using a
rock saw. One half of the core was returned to its original box (5-foot long
wooden box) for long term storage. The remaining half was sealed in a polyethylene
bag for direct shipment to the laboratory for analysis. The core that was returned
to the box remains on-site as a permanent record of the hole. For long term
storage of the core, the boxes have been marked with aluminum tags inscribed
with the hole number, box number and sample interval. The boxes have been stacked
on wooden supports and covered with plywood as temporary protection from the
elements. An arrangement for longer-term on-site storage is planned for the
2004 program.
Samples were also taken for metallurgical purposes during
the 2003 program. Sections of core were quartered and bagged and submitted for
testing in Vancouver. These were: GC03-437 (24.39m - 47.3m), GC03-437 (47.3m
- 74m), GC03-437 (74m - 91.36m), GC03-43 (258.17m - 306.93m), GC03-441 (99.67m
- 142m), and GC03-442 (288m - 329.1m) .
Sampling protocol called for the geologist to insert three
control samples; a blank, a standard and a duplicate for every 20 samples to
be submitted to the lab for analysis. The 20-sample size equates with the size
of the sample batch grouped for analysis at the lab. The placement of all control
samples was essentially random within the 20-sample batch. Blanks, which consisted
of non-metalliferous marble, were inserted and tagged in the sequence determined
by the geologist and bagged during the core splitting and sampling collection.
Duplicate sample locations were marked by the geologist. Empty bags with duplicate
tags were submitted to the lab to indicate the sample was to be split for duplicate
analysis.
Quality control analytical standards were purchased from WCM
Sales of Vancouver BC for the 2003 program. The standards consisted of three
types. There were two gold ore standards consisting of a high-grade (PM-152)
and a typical or average grade (PM-184). The grades of these gold standards
were 2.83 grams per tonne and 0.52 grams per tonne respectively. The copper
standard (Cu 108) was 0.66% copper and 18.3 grams silver per tonne. Standards
were stored on site in 30 gram sachets that were bagged in the sequence chosen
by the geologist and submitted to the lab for analysis. The assay lab submitted
10% of the samples for internal checks. Only limited third party analysis of
the assay results has been completed.
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13
S
AMPLE
P
REPARATION
,
A
NALYSES AND
S
ECURITY
13.1
Past Programs
Sample preparation has gone through several transitions since
the early drilling in the 1960's. Prior to 1964, drill core was split in 3-meter
(10-foot) lengths and half of the core shipped to Coast Eldridge laboratory
in Vancouver for copper assay. Some 30-meter (100 ft.) composites were assayed
for gold during this period.
In 1964, a small assay laboratory was constructed on site
and during the first season of operation, 3,747 samples were processed. Half
of the split core was crushed on site to minus quarter inch then a 340 gram
(0.75 lbs.) split was separated using a Jones splitter. At the lab the sample
was split and crushed to minus10 mesh then 95% of the crushed material was pulverized
to minus100 mesh and assayed for copper using a double digestion with titration
and colorimetric determinations. Intervals that met or exceeded a threshold
copper grade of 0.4% over intervals of 12 to 18 metres (40-60 ft.) were composited
and shipped to Coast Edridge for gold and silver assays. It is not known if
these pulps were re-homogenized before compositing. Some gaps in the original
sampling exist within distinctly anomalous gold intervals. Early gold assays
performed on 30.5 -meter (100 ft.) composites differ significantly from the
12-18 metre (40-60 ft.) composites assayed in later campaigns. These composites
were assayed by commercial lab then checked by the Kennecott Research Centre
lab and are considered to be reasonably accurate.
During 1964, cross checking of Galore Creek laboratory copper
analyses were carried out on a routine basis by Kennco Explorations laboratory
in North Vancouver and at Coast Eldridge laboratory. Several samples were also
checked at Hawley and Hawley Assayers of Tucson and by Bear Creek Laboratory
in Denver.
In 1966, composites from the Central Zone were reportedly
re-assayed for gold and silver after discrepancies were found between the values
obtained in 1964 and 1965. The re-assay was carried out at the Kennco Laboratory
in North Vancouver. The results showed marginal increases in gold and silver
content. Assay certificates could not be located for either original or re-assayed
material.
In 1967, the pulps from 140 samples were split and a portion
analyzed by five separate laboratories; including Coast Edridge, Sudbury and
three of Kennecott's labs. A standard was included with the samples in order
to check the reproducibility of the method being used. Comparison of standard
assays showed that the Coast Eldridge laboratory (using the titration method)
was the least reliable. According to R. Simpson, an Independent Qualified Person
and author of the previous Technical Report on Galore Creek prepared for Spectrum,
the field lab assays compared well with atomic absorption analyses at other
labs (Figure 8).
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In the 1970's programs, the split half of the core samples
was still crushed on site to minus 0.5 inches and split to obtain a 0.75 pound
sample. This was further crushed in a cone crusher then placed in Kraft paper
bags and shipped by air in locked metal boxes to either the Kennco Exploration
Lab in North Vancouver (1972/73), or Chemex Lab (1974) for assay. Assaying for
gold and silver was only performed on composite samples (up to 15m) which averaged
over 0.4% copper. No information on check assays or quality control from the
1970's drill programs could be located. All coarse rejects from the 1970's were
stored on the property.
During the 1990 drill program carried out by Mingold, half
of the split core was crushed on site to ¼ inch (6.35 mm) and a 300-325
gram split was taken and shipped to Min-en Laboratory in Smithers for further
processing and assaying. For gold analysis, a 30 gram sample split underwent
fire assay fusion with analysis by atomic absorption spectroscopy (AAS finish).
If greater than 1,000 ppb gold was present then a fire re-assay was carried
out. If high copper content was noted in drill logs the sample was directly
fire-assayed. If gold content reached or exceeded 3.11 g/t (0.1 oz/ton) then
the reject portion of the sample was shipped to the Min-En lab in Vancouver
for metallic screening. For this process, the entire reject was pulverized to
-102 mesh, recombined with the previous pulp portion and metallic screened for
+120 mesh gold. Two 30 gram assays were then done on the -120 mesh fraction
and the results averaged. The values from both fractions
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(+120/-120) were then mathematically combined to produce a
net gold value. Copper and silver analyses were done on a 2-gram sample split
from the initial pulp. No check assays were documented and rejects were stored
on site.
In 1991 sample preparation was modified on recommendations
from Min-En after they undertook a number of tests on coarse reject core samples.
The raw core was crushed to 3 mm (1/8") and a 500-gram split taken, pulverized
to 95% -120 mesh then rolled and bagged for analysis. The remaining reject was
bagged and stored in Smithers. Samples were fire assayed using one assay ton
sample weight. For each gold analysis batch of 24 samples they would insert
a blank and a standard sample and when the value of the standard fell outside
a 95% confidence limit the entire batch was re-run. Internal monitoring of copper
assays was routinely conducted on 50 sample batches. The top 10% of all gold
assays per page were rechecked and reported in duplicate along with the standard
and blank. Every 20th sample was shipped to Eco-Tech laboratories of Kamloops
for check assay.. Figure 9 shows the gold check assay comparison for the 571
samples analyzed in 1991.
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The check assays showed reasonable correlation for copper
and fairly good correlation with gold at grades exceeding 0.25 g/t, although
Eco-Tech assays tended to be marginally higher. Gold grades below 0.25 g/t,
showed considerable variation
13.2
2003 Program
Shipment of core samples from the Galore Creek camp occurred
on a hole by hole basis. Rice bags containing bagged core samples each were
marked and labeled with the sample numbers and the Vancouver laboratory address.
Rice bags were assembled into sling loads for transport by helicopter to the
Bob Quinn airstrip and transported by freight forwarders (Banstra) that delivered
the samples directly to the laboratory by truck.
All laboratory analysis for the 2003 program was carried out
by ALS Chemex of Vancouver. Upon arrival to the lab the samples were logged
in a tracking system and the weight was recorded. Each sample was crushed and
dried and a 250 gram split pulverized to greater than 85% passing 75 microns.
Sample analysis for gold content was conducted by preparing a 30 gram sample
by fire assay fusion followed by analysis with atomic absorption spectroscopy
(AAS finish). The lower and upper limits for this method were 0.005 ppm and
10 ppm respectively. Overlimit analysis was provided by nitric acid aqua regia
digestion of a 0.4 to 2.0 gram sample followed with an AAS finish.
Additional analysis was conducted for 34 elements, including
copper and silver by nitric acid aqua regia digestion followed with analysis
by analyzed by inductively coupled plasma-atomic emission spectrometry (ICP_AES).
The analytical results were corrected for inter-element spectral interferences.
As indicated in Section 12.2, only limited third party analysis
of the assay results has been completed. A review of duplicate sample analytical
results by this author indicated that differences in mean values for duplicate
samples were not statistically significant at a 95% confidence level. A scatter
chart of original versus duplicate samples is depicted in Figure 10 while Table
7 summarize the results of
t
tests for paired duplicate samples from
the ALS Chemex results for copper and gold. Where the
t
statistic exceeds
the critical value for a 5% level of significance, the difference is said to
be statistically significant at that level. (ie. there is at least a 95% probability
that the difference is significant).
While no statistically significant difference was detected
at the stated confidence level, the database is relatively small (only 8 holes)
and no firm conclusions should be drawn from the results of the analysis. Differences
in mean values were relatively high for gold (9%) and a larger database should
be available from the 2004 program to provide a more definitive analysis. A
more comprehensive check assay program including checks of duplicates by an
alternate laboratory is recommended.
All laboratory pulps and rejects from the 2003 program are
stored in a company-leased warehouse in Vancouver.
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Table 7 - Mean Differences, 2003 Duplicate Samples
|
|
Cu%
|
Au G/T
|
|
Observations
|
72
|
72
|
|
Original
|
0.489
|
0.340
|
|
Duplicate
|
0.511
|
0.371
|
|
%Difference
|
4.5
|
9.1
|
|
t
Stat (T)
|
1.818
|
1.119
|
|
P(T<=t) two-tail
|
7.3%
|
26.7%
|
|
t Critical two-tail
|
1.994
|
1.994
|
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14
D
ATA
V
ERIFICATION
Computer databases for the Galore Creek project have evolved
over time, having benefited from both in-house and external services for data
management. Up until 1990, data was entered manually. Subsequent to this, assay
values were transferred digitally from data files supplied by the assay laboratory.
In 1992 Kennecott conducted an assay database check on 375
assay files representing 7500 samples. The most common mistakes found were typing
errors or data that had missed being input into the database. There was also
some confusion because of missing prefixes in check samples from ECO Tech Lab.
Consequently all previous data was merged into a single database, audited and
converted from Imperial to metric units prior to the final resource estimation.
In 2003, prior to the commencement of the drilling program,
R. Simpson, an Independent Qualified Person and author of the previous Technical
Report on Galore Creek prepared for Spectrum, conducted spot checks on the 1991
re-assay program. Values from the original assay certificates and digital assay
files were compared to the digital database used in the MRA resource model and
a significant number of discrepancies were discovered, however, none of them
were in intervals containing significant mineralization. Out of 1329 samples
audited (from 94 assay certificates), 9 were flagged as missing in the database
(value=-1) and 14 were apparent data entry errors.
The data is currently maintained as an Microsoft Access
®
database. It is accompanied by a Visual Basic
®
interface to facilitate
entry, viewing and export of data. For that data which could be cross-referenced
to a assay certificate, the assay intervals and sample numbers have been confirmed
digitally. Only about 10% of the copper and 15% of the silver assay certificates
from the pre-2003 drilling could be located. Certificate data for gold was more
extensive due to the comprehensive re-sampling program undertaken in 1991. Including
the 2003 season, approximately 14% of the copper values, 78% of the gold values
and 21% of the silver values could be cross-referenced to assay certificates.
To address the limited availability of certificate data, assay and sample data
from the hand-written logs were also re-entered digitally and compared with
the database for verification. In 2004, prior to completion of the update on
resource estimates, the author also conducted spot checks on about 15% of the
data. As well, 100% of the data was screened automatically by the modeling software
(Medsystem
®
/Minesight
®
) for missing intervals
and values outside the normal range of data. A number of typographical errors
and inconsistencies in the treatment of unsampled and/or low-grade intervals
were discovered and corrected.
Collars from the pre-2003 drilling were surveyed in 1966 and
1991. Nearly all holes in the Central and Southwest Zones have been surveyed
but many in peripheral areas have only approximate coordinates. Holes drilled
prior to 1991 used only acid dip tests for directional information. The only
exceptions were GC218, GC228 and GC235 where a Tropari instrument was utilized.
A Sperry Sun single-shot instrument was used in 1991
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on angle holes but 24 vertical holes had no down-hole survey
readings taken. A recent survey by Eagle Mapping has highlighted a significant
discrepancy between the elevations recorded for the drill holes and the newly
generated topographic surface. The average difference in elevation between the
reported collar elevations and the new surface is approximately -24 metres.
As an interim measure, the topographic surface has been lowered 24.2 metres
to accommodate the difference. This discrepancy should be investigated and the
appropriate corrections undertaken to bring the two surveys in line before the
next update on resource estimates.
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15
A
DJACENT
P
ROPERTIES
The Copper Canyon claims cover 2100 acres adjacent (due east)
of the Galore Creek claim blocks. Spectrum entered into an agreement with Eagle
Plains Resources in September 2003 to earn up to an 80% interest in these claims
through a combination of shares, payments and work programs. To the extent that
economic mineralization is confirmed on the Copper Canyon claims, it could be
developed and processed as part of the Galore Creek operation under the terms
of Spectrum's agreement with Eagle Plains.
Under the terms of the agreement, SpectrumGold has an option
to acquire a 60% interest in the project from Eagle Plains by completing C$3
million in exploration expenditures over the next 4 years, issuing 400,000 shares
of SpectrumGold and making payments totaling C$250,000. SpectrumGold may earn
an additional 20% interest in the project for a total of 80% by paying Eagle
Plains C$1 million and completing a Feasibility Study on the project by no later
than September 2011.
The Copper Canyon property has seen intermittent exploration
work from the mid 1950's up through 1991. This historic exploration work at
Copper Canyon indicates the presence of widespread gold, silver and copper mineralization
similar to the Galore Creek deposit. To date mineralization has been identified
in three separate areas on the property. Highlights from drilling on the project
in 1990 are summarized in the table below.
Table 8 - Significant Results - 1990 Drill Program, Copper
Canyon
|
Drill Hole
|
Length
|
Gold
|
Silver
|
Copper
|
|
|
(m)
|
(g/t)
|
(g/t)
|
(%)
|
|
90-DDH-01
|
22.0
|
4.1
|
13.0
|
0.7%
|
|
90-DDH-02
|
270.8
|
1.9
|
22.3
|
1.1%
|
|
Including
|
117.0
|
2.5
|
38.4
|
1.8%
|
|
90-DDH-04
|
13.0
|
4.0
|
33.3
|
1.5%
|
|
90-DDH-05
|
32.0
|
2.4
|
17.5
|
0.8%
|
SpectrumGold has also signed an agreement with Pioneer Metals Corporation (TSX:
PSM) to acquire a 60% interest in the Grace property totaling 2,500 hectares
(6,200 acres) that directly adjoins the Galore Creek property to the north.
Under the agreement, SpectrumGold must spend a total of C$5 million over five
years on exploration of the property to earn its interest. In addition, SpectrumGold
will subscribe for C$1 million in units of Pioneer Metals at $0.255 per unit.
Each unit consists of one share and one-half share purchase warrant with each
warrant being exercisable for two years into one share of Pioneer Metals at
a price of $0.35 per share. The Grace property has been the subject of intermittent
exploration work including surface geochemistry, airborne and ground magnetic
surveys and limited drilling. Based on this historical work, the Grace property
is believed to have the potential to host gold-copper mineralization similar
to the Galore Creek deposit.
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16
M
INERAL
P
ROCESSING
AND
M
ETALLURGICAL
T
ESTING
A total of 96 specific gravity measurements were made on core
samples in 1991/1992. This data was sorted by material type and utilized to
develop regression curves for use in tonnage determinations for the 2004 resource
estimate. This data should be further supplemented by in-situ measurements of
bulk density.
Underground development for bulk sampling was carried out
in the 1966 and 1967. Most of the work was on the Central Zone where 756 metres
of tunnels were driven from one adit. A total of 51 metres of underground development
was also conducted in the North Junction Zone. Pilot plant metallurgical testing
was carried out in 1967 by Wright Engineers Ltd. on a 50-ton bulk sample from
the Central Zone. The head grade of the bulk sample assayed 1.28% copper. The
overall metallurgical balance from the pilot plant test was as follows:
Table 9 - Pilot Test Results
|
Stream
|
Grade
|
Recovery %
|
Copper
%
|
Gold
OPT
|
Silver
OPT
|
Copper
|
Gold
|
Silver
|
Feed
Concentrate
|
1.28
25.2
|
-
0.157
|
-
5.48
|
-
96.1
|
-
63.9
|
-
84.5
|
The optimum grind for rougher flotation was established at 75% passing 100 mesh
(149 microns) and 50% passing 200 mesh (74 microns). The optimum grind for concentrates
was established at 95% passing 325 mesh (37 microns). Britton Research Ltd.
conducted testing of lower grade material and estimated recoveries of 83% and
81% for copper grades of 0.54% and 0.31% respectively.
In 1992, further bench flotation tests were carried out on
drill core from five 1991 holes by Dawson Metallurgical Laboratories in Salt
Lake City. The object of this study was to determine the amenability of the
composites to a standard flow sheet developed previously and to determine if
gold recovery could be significantly improved. The study used 4 composites from
the Southwest Zone and two from the Central Zone. It was found that both gold
recoveries and copper concentrate grades for the Southwest Zone were lower than
those indicated for the Central Zone. This was attributed to the higher pyrite
content in the Southwest Zone and the association of at least part of the gold
with pyrite. Overall copper and gold recoveries in a copper concentrate grading
25% copper were estimated at 90.3% and 58% respectively based on constant tailing
grades of 0.065% copper. Concentrator tail grades for gold also tended to remain
fairly constant at 0.137 grams per tonne for the Central Zone and 0.274 grams
per tonne for the Southwest Zone. Gold recovery was projected based on head
assay and rougher tail residue. A nugget effect was observed in tests from many
of the higher-grade composites. Gold recoveries were not optimized as part of
these studies.
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It was also reported that several composites were not upgraded
to 25% copper in concentrate after two stages of cleaning with regrinding.
During 2003 a metallurgical scoping test program was completed
on four individual composites of drill core selected by NovaGold. The test work
was carried out by G&T Laboratories Ltd. in Kelowna. The drill core, from
the 2003 drilling campaign, have been identified as DDH 437, DDH-438, DDH-441
and DDH-442. The DDH 437 sample is from the Southwest Zone while the remainder
are from the Central Zone. These samples were selected to investigate the metallurgy
of higher-grade mineralization.
The Southwest Zone sample was the highest in grade and contained
the most pyrite. Chalcopyrite was the dominant copper mineral in all the samples
except DDH 441 where bornite occurrence was significant.
High copper and gold recoveries and copper concentrate grades
were achieved at relatively coarse primary grinds using standard grinding and
flotation procedures and reagents. Rougher concentrates upgraded well following
a regrind. The recoveries and concentrate grades were marginally higher than
those achieved in the 1966 and 1992 flotation test programs. Copper, gold and
silver recoveries attained were of the order of 90%, 70% and 80% respectively
for the samples tested. A summary of the 2003 test results is Table 13. Highlights
from the previous years' testing are provided in Table 10 through Table 12.
Gravity concentration of ground samples gave variable and
low recovery of gold. The gold grains were generally fine, indicating that gravity
concentration might not be effective.
The key observations from the 2003 test work specific to the
four samples are as follows:
|
1.
|
The Southwest Zone sample from DDH-437 has significantly
more pyrite than Central Zone samples. This adversely impacted recovery,
selectivity and concentrate grade. In practice, this material should be
blended with Central Zone material.
|
|
|
|
2.
|
A primary grind at a 80% passing 150 microns nominal
is sufficient for copper mineral and gold liberation. A coarser grind
of 250 microns decreased copper recovery and grade, but had little effect
on gold recovery, likely due to its inherent fine grain.
|
|
|
|
3.
|
A significant fraction of gold is free and fine-grained
despite the relatively coarse grind and floats readily with the copper
minerals.
|
|
|
|
4.
|
Gravity concentration of gold following the primary
grind is potentially not favorable since it is readily recovered at flotation.
Its potential on cleaner scavenger tailings for incremental gold recovery
should be considered in future test work.
|
|
|
|
5.
|
Copper and gold floated readily within a short rougher
flotation time of 5 minutes using simple flotation schemes and standard
reagents for copper.
|
|
|
|
6.
|
Rougher concentrate regrind will likely be required
for effective cleaning.
|
|
|
|
7.
|
It appears that two stages of cleaners would suffice
to achieve, nominally, 95% copper and 75% gold recovery at over 30% copper
grade.
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|
8.
|
The concentrates are relatively clean. Selenium
appears to be the only impurity of concern.
|
|
|
|
9.
|
The occurrence of gold in these samples as liberated
fine-grained particles and its recovery in copper concentrate is typical
of porphyry copper deposit and is consistent with studies by Hatch and
G&T Metallurgical Services on porphyry copper deposits worldwide.
G&T's studies have also indicated little incremental recovery of the
fine gold by gravity concentration in such deposits.
|
Table 10 - 1965 Metallurgical Testing, Drilling
|
Head Assay
|
Grind
|
Rougher Flotation
|
Rougher Conc
|
Cleaner Flotation
|
Cleaner Conc
|
|
% Cu
|
g/t Au
|
% -100
mesh
|
PH
|
% Cu
Rec.
|
% Au
Rec.
|
% Cu
|
g/t Au
|
% Cu
Rec.
|
% Au
Rec.
|
% Cu
|
g/t Au
|
Locked cycle tests; rougher conc regrind to -200 mesh
1.06
1.33
0.79
1.16
2.12
1.16
|
|
73.3
88.7
79.2
79.1
79.8
82.6
|
9 to 9.5
|
|
|
|
|
94.6
95.8
91.3
95.0
97.4
96.7
|
77.1
|
23.7
29.9
29.6
32.1
22.1
24.3
|
11.5
|
Feed grade vs Cu recovery (locked cycle tests)
0.79
1.06
1.16
1.22
1.33
1.61
2.12
|
|
|
|
|
|
|
|
91.3
94.6
95.0
96.7
95.8
95.9
97.4
|
|
23.6
23.7
25.6
24.3
29.9
28.0
22.1
|
|
Table 11 - 1966 - 1967 Pilot Plant Test Work
|
Head Assay
|
Grind
|
Rougher Flotation
|
Rougher Conc
|
Cleaner Flotation
|
Cleaner Conc
|
|
% Cu
|
g/t Au
|
% -100
mesh
|
PH
|
% Cu
Rec.
|
% Au
Rec.
|
% Cu
|
g/t Au
|
% Cu
Rec.
|
% Au
Rec.
|
% Cu
|
g/t Au
|
|
1.28
|
|
|
|
|
|
|
|
96.1
|
63.9
|
25.2
|
5.38
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Table 12 - 1991 Drilling - Bench Tests
Revised flowsheet: finer grind, more reagents, longer flotation times, 2-stage
cleaner
|
Zone
|
Head Assay
|
Grind
|
Rougher Flotation
|
Rougher Conc
|
Cleaner Flotation
|
Cleaner Conc
|
|
% Cu
|
g/t Au
|
% -100
mesh
|
PH
|
% Cu
Rec.
|
% Au
Rec.
|
% Cu
|
g/t Au
|
% Cu
Rec.
|
% Au
Rec.
|
% Cu
|
g/t Au
|
Central
SW
SW
SW
|
0.82
0.63
1.78
0.33
|
0.62
1.23
1.85
0.69
|
93.6
90.2
90.7
90.5
|
9.5
9.8
9.4
9.4
|
96.0
89.7
92.8
89.3
|
60.9
52.4
75.0
43.1
|
6.6
8.8
10.3
11.3
|
3.2
11.9
8.6
6.3
|
70.7
81.9
78.3
84.1
|
36.4
48.5
58.9
40.1
|
8.9
20.6
20.0
16.2
|
3.5
28.1
15.5
16.1
|
Table 13 - 2003 Bench Tests
|
Cleaner
|
Zone
|
Head Assay
|
Grind
|
Rougher Flotation
|
Rougher Conc
|
Cleaner Flotation
|
Cleaner Conc
|
|
% Cu
|
g/t A
|
% -100
mesh
|
PH
|
% Cu
Rec.
|
% Au
Rec.
|
% Cu
|
g/t Au
|
% Cu
Rec.
|
% Au
Rec.
|
% Cu
|
g/t Au
|
Fine primary grind 160 um
3-stage
2-stage
1-stage
|
SW - 437
|
1.83
|
3.63
|
|
10
|
95.2
|
88.4
|
9.8
|
18.0
|
86.9
89.1
91.4
|
75.4
78.9
80.3
|
22.7
20.3
17.8
|
39.0
35.5
31.0
|
Fine primary grind 159 um
3-stage
2-stage
1-stage
|
C - 438
|
1.57
|
0.47
|
|
10
|
98.8
|
84.5
|
17.8
|
4.58
|
95.5
96.8
97.7
|
71.1
74.1
76.4
|
31.4
30.6
29.0
|
7.0
7.0
6.8
|
Fine primary grind 139 um
3-stage
2-stage
1-stage
|
C - 441
|
2.21
|
1.2
|
|
10
|
96.1
|
81.3
|
20.6
|
9.45
|
89.5
91.7
94.2
|
69.0
70.9
73.4
|
54.9
53.6
47.2
|
22.9
22.4
19.9
|
Fine primary grind 144 um
3-stage
2-stage
1-stage
|
C - 442
|
1.09
|
0.71
|
|
10
|
98.3
|
83
|
13.9
|
7.59
|
96.5
96.9
97.5
|
75.1
76.3
77.8
|
33.9
33.4
31.4
|
17.0
16.9
16.1
|
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17
M
INERAL
R
ESOURCE
AND
M
INERAL
R
ESERVE
E
STIMATES
The current mineral resource inventory for the Galore Creek
Project contains estimates for the Central and Southwest Zones only. Other mineral
occurrences exist within the property boundaries, however, except for the Central
and North Junction Zones, which received additional focus by Hudson Bay during
the 1970's, only the above-mentioned areas have been delineated sufficiently
to make estimates of mineral resources. Both the Central and Southwest Zones
have benefited from additional exploration activity and revised and/or updated
interpretations of geological and structural data since the early 1990's. The
update for these zones follows the recently completed 8-hole, 2,800 metre drilling
program designed to verify previous results and better understand deposit variability,
zonation and controls for mineralization.
Table 14 provides summaries of the current resource estimates
for the Central and Southwest Zones. Resources have been reported using equivalent
copper values which have been calculated by estimating the net smelter return
for gold and silver and back-calculating what the copper grade would have to
be for the revenue to be generated from copper alone. A brief description of
the 2 resource areas is provided below while details on each zone as well as
further information on equivalent value calculations can be found in the following
subsections.
Table 14- Mineral Resource Estimates
Galore Creek, Central and Southwest Zones
Reported at 0.5% Cu Equivalent Cutoff Value
Indicated
|
Zone
|
Tonnes
(Millions)
|
Grade
|
|
Cu %
|
Au G/T
|
Ag G/T
|
Central
Southwest
Total, Indicated
|
251.4
34.5
285.9
|
0.75
0.59
0.73
|
0.36
1.04
0.44
|
5.9
3.7
5.7
|
Inferred
|
Zone
|
Tonnes
(Millions)
|
Grade
|
|
Cu %
|
Au G/T
|
Ag G/T
|
Central
Southwest
Total, Inferred
|
69.7
29.1
98.8
|
0.61
0.37
0.54
|
0.26
0.63
0.37
|
5.5
3.3
4.8
|
The Central Zone, which strikes north-northeast, is modeled
as two primary structural domains separated by a moderate west-dipping fault
along which significant displacement has occurred subsequent to the mineralizing
events. A number of post-mineral and weakly mineralized intrusives have also
been modeled as sub-domains
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within the two. The Southwest Zone has been modeled as a single
domain striking east-southeast and dipping 60 degrees south-southwest.
A total of 326 drill holes were used in the resource estimate,
with approximately 21,700 assays (copper) averaging 2.94 metres in length contained
within the reported zones. These were composited in 6-meter intervals down hole
within each zone to form approximately 12,100 composites averaging 5.76 metres
in length.
The grades were estimated by ordinary kriging using unique
3D anisotropic variograms for each grade and zone. A minimum of 6 composites
from at least 2 drill holes were used to estimate grades in each block, with
a maximum of 3 composites per hole and 18 total. Only those composites with
the matching codes were used in the interpolation of blocks within each zone
of the model. The block size was 25mx25mx12m high. The average distance from
each block centre to the closest composite (adjusted to the long axis based
on anisotropy) was 48 metres for indicated and 122 metres for inferred.
17.1
Database General Description
The mineral resource estimates for the Central and Southwest
Zones are based primarily on information from core drilling, supplemented in
part outcrop data and underground sampling. A total of 326 core holes have been
completed in the area of the Central and Southwest Zone to date, including the
2003 program (8 core holes). The resource model was restricted to the use of
sample data from the 326 core holes. Outcrop and underground data was used to
assist in the 3D modeling of the geological and structural boundaries however
assay data was not utilized for the resource estimate.
17.2
Drilling
The Central Zone deposit is drilled from surface (630 to 850
m. elevation) down to about 350 to 500 metres elevation on an approximate spacing
of 50 to 100 metres north-south and 50 metres east-west. Below this, as well
as on the extremities, the drill density is much less. The deepest hole is GC-0224,
which is drilled to about 160 metres elevation. The majority of the holes have
be drilled close to vertical however several, including those drilled in 2003,
have been drilled at angles to the east so as to intersect the structure at
close to right angles as possible. A number of holes have also been drilled
at angles to the west. Overall, drilling has covered an area about 2,500 metres
north-south and 1,000 metres east-west.
The Southwest Zone, located about 600 metres to the southwest
of the Central Zone at surface elevations from 850 to 1050 metres, is drilled
at a much lower density. The majority of the holes have been angle drilled toward
the north at a spacing of about 100 metres east-west and 100 to 200 metres north-south.
The drilling covers an area of about 800 metres east-west and 500 metres north-south.
Further detail on drilling can be found in Section 11.
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17.3
Sample Statistics
The combined database for the two zones (core holes only)
consists of 21,700 sample intervals for copper averaging 2.94 metres in length.
Approximately 86% of the samples fall within the interpolation boundaries of
the Central Zone while the remainder are located within the Southwest Zone boundaries.
A number of the early gold and silver assays were derived from composite samples
taken over intervals of 15 to 30 metres subsequent to the initial sampling for
copper. Some of these intervals were re-sampled over shorter intervals during
the early 1990's. Overall, the database contains 21,200 assays for gold and
16,000 for silver within the reported zones. The gold and silver database is
more complete within the Southwest Zone due to the emphasis on gold. Assay data
distributions for copper, gold and silver are positively skewed and approximate
normal distributions when transformed to logarithmic values (lognormal distributions).
Brief statistical summaries are provided in Table 15 through Table 17.
Table 15 Copper Assay Statistics
|
Zone
|
Count
|
Average
%Cu
|
Std. Dev.
%Cu
|
Central Volcanics
Central Weak/Post Mineral Intrusives
Southwest
Total Central & Southwest
|
16,720
3,002
1,952
21,674
|
0.524
0.134
0.309
0.452
|
0.686 0.291 0.604
0.654
|
Table 16 Gold Assay Statistics
|
Zone
|
Count
|
Average
%Cu
|
Std. Dev.
%Cu
|
Central Volcanics
Central Weak/Post Mineral Intrusives
Southwest
Total Central & Southwest
|
16,294
2,946
1,935
21,175
|
0.252
0.093
0.615
0.263
|
0.691
0.345
1.546
0.786
|
Table 17 Silver Assay Statistics
|
Zone
|
Count
|
Average
%Cu
|
Std. Dev.
%Cu
|
Central Volcanics
Central Weak/Post Mineral Intrusives
Southwest
Total Central & Southwest
|
11,978
2,043
1,935
15,956
|
5.709
2.014
2.692
4.870
|
5.771
3.450
5.208
5.654
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17.4
Geological and Structural Models
The Central Zone is divided structurally into two main mineralized
zones by a moderate west-dipping north-northeast trending fault known as the
East Fault. It has been estimated that displacement of up to 200 metres has
occurred along this fault subsequent to the main mineralizing events. In the
north end of the deposit the fault may be better characterized as a fault zone
up to 60 metres wide with variable displacement across multiple surfaces. For
the purpose of the resource estimate, the Central Zone has been modeled as two
primary structural domains (hangingwall and footwall zones) separated by the
interpreted 3D location of the fault. These domains have been further subdivided
by modeling the more important late and post-mineral intrusives as separate
lithological sub-domains (I9 and I11) within the two. Additional detail is available
with respect to structure, lithology and alteration, however it is believed
that further subdivision based on these units would have resulted in a number
of smaller disjointed domains, making the modeling efforts more difficult and
overly complex. Future models may incorporate some of these features as well
as separate modeling of distinct gold-rich zones located within the north, central
and southern areas of the Central Zone.
The Southwest Zone has been modeled as a single domain striking
east-southeast and dipping 60 degrees south-southwest. 3D solid models of a
locally mineralized breccia unit (Southwest Breccia) as well as grade shells
(SW Footwall and SW Main) representing the approximate boundaries beyond which
mineralization in drill samples fall below 0.5% copper and/or 0.5 grams gold
per tonne were also constructed but only used as aids to facilitate variogram
modeling and interpolation strategies.
The various domains within the Central and Southwest Zones
were constrained horizontally by interpolation boundaries set at reasonable
proximity (200m) to the peripheries of the drilling; on top by the overburden/bedrock
contact surface; and at depth by a horizontal plane set at 40 metres elevation.
To aid in specific gravity determinations the interface between broken and solid
rock, known as the "stick-rock" surface was also modeled, but not used for composite
selection nor to limit or control grade interpolation.
17.5
Assay Capping (Cutting)
In order to reduce the influence of statistically anomalous
sample data on resource calculations a number of higher-grade assay values were
capped at levels determined through examination of probability distribution
data (Appendix 23.1) . Table 18 provides a summary of capping levels applied
to the Galore Creek data. All data above these levels were set back to the chosen
levels prior to compositing.
Significant inflexion points were evident in both copper and
silver curves, indicating that several sample populations may exist within the
data. Distribution curves for gold were relatively straight however, as with
copper and silver, breaks were also noted at the upper end of the of the distributions
curves. Assay values were capped at levels approximating the start of these
upper breaks in the curves. As indicated previously, assay data for all
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three metals are positively skewed (mean to the right of mode)
and approximate normal distributions curves when transformed to logarithmic
values. The capping levels represent points on the distribution curves at distances
ranging from 2.1 to 4 standard deviations from the mean values after natural
log transformations have been applied. In all, 8 copper, 6 gold and 6 silver
values, representing only0.03% of the assay database, were capped.
Table 18 Assay Capping Levels
|
Zone
|
Capping
Level
% or G/T
|
Standard
Deviations
from
Mean (LN)
|
Population
Maximum
% or G/T
|
Number
Capped
|
Copper
Central
Southwest
|
7.00
4.00
|
2.5
2.6
|
12.00
7.02
|
3
5
|
Gold
Central
Southwest
|
20.00
15.00
|
4.0
2.7
|
29.38
24.99
|
2
4
|
Silver
Central
Southwest
|
50.00
50.00
|
2.1
2.2
|
29.38
24.99
|
3
3
|
|
|
Note: LN
means lognormal.
|
17.6
Composites
Assays intervals have been composited down the hole from collar
to final depth in length-weighted averages each representing 6.0 metres of continuous
sample. Other composite lengths were examined, however the selected length is
believed to represent the best compromise between shorter lengths where variability
was too high to expect reasonable prediction of grade at a distance and longer
composites, which can result in excessive smoothing of values to impart a reasonable
degree of block model resolution. Assays intervals contained within the structural
and lithological domains discussed earlier have been composited separately and
assigned unique codes to differentiate them from the surrounding material. A
summary of composite statistics can be found in Table 19. As expected, the composite
populations within the mineralized zones also exhibit lognormal distributions.
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Table 19 Composite Statistics
|
Zone
|
Count
|
Avg.
Length
(m)
|
Copper %
|
Gold G/T
|
Silver G/T
|
Avg
|
S.D.
|
Avg.
|
S.D.
|
Avg.
|
S.D.
|
Central Volcanics
Central Post Mineral
Southwest
Total Central&SW
|
8,898
2,234
1,045
12,177
|
5.82
5.46
5.89
5.756
|
0.495
0.104
0.262
0.403
|
0.618
0.242
0.495
0.579
|
0.229
0.070
0.505
0.224
|
0.571
0.277
1.130
0.610
|
5.709
1.096
2.266
3.223
|
5.771
2.618
3.330
4.735
|
In total, 6,248 intervals within the zones of interest were
missing silver assays. In comparison, the database only contained about 503
intervals missing copper and 993 intervals missing gold. All missing assay intervals
were assigned values of zero grade before compositing. This was necessary because
the database did not differentiate between intervals not sampled because it
was believed to be low grade or waste and intervals not sampled for other reasons
such as poor drilling recovery. As can be observed from the differences between
assay (4.9 g/t) and composite grades (3.2 g/t), this may have impacted the silver
grades significantly, however it cannot be determined without further sampling
whether this represents a downward bias in the estimates but this is highly
probable.
Because all drilling has been collared at surface, composites
begin at the upper contact and end at the lower boundary of each zone. Since
it is rare that a sample interval falling within an interpreted zone is an exact
multiple of the composite length, a number of composites were generated along
the lower boundary of each domain which were less than the full composite length.
This results in a number of short composites or "orphans" which may present
a bias when used to estimate the grade model. Since the zones at Galore Creek
are relatively wide, it is believed that the influence of these orphans is minimal.
The average composite length is 5.76 metres however the impact is most apparent
in the post/weak mineral intrusive zone where the average length is only 5.5
metres. A number of comparisons of simple arithmetic averages with length-weighted
averages of composite grades were completed, with results always indicating
that the use of "orphans" represented a slightly conservative bias (lower by
1.1% to 1.7% relative) with respect to grade. This means that the short composites
are lower in grade than the full length ones. The difference would decrease
as higher cutoffs were applied.
17.7
Variogram Analysis
In order to assess the spatial relationship between composite
sample points, a series of 3D relative semi-variograms (correlograms) were generated
for those composites that fell within the interpreted zone boundaries. Plots
of sample variograms for copper, gold and silver composites can be found in
Appendix 23.2. A summary of modeling results is provided in Table 20.
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Table 20 Variogram Modeling Results
|
Zone
|
Rotation/Plunge/Dip
Degrees (Down is -)
|
Model
Type
|
Nugget
C
0
|
Sill
C
1
|
Range Rotated
Axes
(m)
|
Major
X
|
Inter-
mediate
Y
|
Minor
Z
|
Central HW
Copper
Gold
Silver
|
N28E/-10N/-05E
N17W/-16N/-25W
N06W/-51S/-34E
|
Exp
Exp
Exp
|
0.10
0.16
0.08
|
1.00
1.00
1.00
|
193
168
119
|
76
150
151
|
109
69
94
|
Central FW
Copper
Gold
Silver
|
N17E/-34S/-15W
N14E/-08S/-60E
N52E/-33S/-03W
|
Exp
Exp
Exp
|
0.10
0.16
0.08
|
1.00
1.00
1.00
|
208
240
232
|
88
95
82
|
71
79
65
|
Southwest
Copper
Gold
Silver
|
N30E/-60S/0
N30E/-60S/0
N30E/-60S/0
|
Sph
Sph
Sph
|
0.22
0.32
0.45
|
1.00
1.00
1.00
|
179
188
130
|
155
154
134
|
47
65
64
|
Notes:
Exp means
Exponential, Practical Range. Sph means Spherical
These variograms formed the basis for subsequent grade interpolations
as well as provide assistance in development of guidelines for resource classifications
and future drilling. The post/weak mineral intrusives were not modeled due to
the paucity of data. The Central Footwall Zone models were used for these zones
in grade interpolations. Variograms for the Central Hangingwall Zone were the
best formed due to the high density of data and credible models were readily
developed. Interpretation of variogram models for the Southwest Zone was more
difficult due to the lower drilling density. Most variograms demonstrated long
ranges along the major and intermediate axes although nuggets, while still relatively
low, were significantly higher in the Southwest Zone.
17.8
Recommended Drill Spacing
Essentially, a variogram examines the increase in variance
between samples as a function of distance in a given orientation. The distance
beyond which the relationship between samples ceases to be anything but random
is known as the range. Based on the copper variograms developed for Galore Creek,
this distance for the long axis is approximately 190 to 210 metres in the Central
Zone and 180 metres in the Southwest Zone. In general, the target drill spacing
should be about one-half to two-thirds that of the range in order to maintain
some interrelationship between samples used to make grade estimates.
For the Central Zone, this would imply a final staggered pattern
of about 100 to 130 metres along strike and 45 to 60 metres across the zone.
In most areas of the Central Zone, the drill density already exceeds this level.
At depth and along the extremities, this would have to be supplemented by more
holes on the existing drill sections. For the Southwest Zone, the drilling program
should be designed to intercept the dipping structure on a 90 to 120 metre (dip
direction) by 70 to 100 metre (strike) staggered grid in the plane of the structure.
This can be achieved by holes collared on surface 45 to 60
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metres apart north-south and 70 to 100 metres east-west and
drilled -60 degrees toward N30E..
None of these guidelines are intended to take the place of
quality geologic information that may suggest alternate delineation criteria.
17.9
Block Model and Grade Estimation Procedures
The current resource estimate for Galore Creek is based on
a 3-D computer block model oriented along grid north. Block dimensions are 25
metres north-south (N-S), 25 metres east-west (E-W) and 12 metres vertical.
The selected block dimensions are believed to represent a reasonable compromise
between deposit geometry and sample density. It is believed that a smaller block
size would impart a degree of resolution not possible with the current sample
density, while larger dimensions would not suit the limited thickness and variability
inherent with the geometry of the zones. This is particularly important in the
Central Zone, where the complex geometry of the internal zones of post/weak
mineral intrusives is best modeled with smaller blocks. The block height and
width are also convenient dimensions for subsequent pit optimization and planning
efforts.
Prior to interpolation of grade values into each block, 3-D
solid models were constructed for each of the interpreted structural, lithological
and interpolation domains discussed in Section 17.4. Each block or portion thereof
which fell within the modeled solids was assigned an "zone" code and percentage
based on the proportion of the block contained within each domain or zone. Blocks
completely internal or external to the zone were assigned a block percentage
of 100 or 0 respectively. Blocks were also coded for the percentage of the block
that resided below the topographic, bedrock (broken) and intact rock surfaces.
In the Central Zone area it was possible for a block to reside on the interface
between the two structural domains (HW & FW) as well as contain a portion
of the post/weak mineral intrusive. To address this possibility, a second set
of zone codes, block percentages and grade variables were carried for each block.
The primary zone code was assigned on the basis of majority block ownership
between the hangingwall and footwall units and the percentage determined by
the combined content for the two domains. If the block also contained a portion
of the post/weak mineral intrusives, the secondary block code was also assigned
accordingly and block percentage determined based on the proportion of the block
located within the intrusives.
Composites were also assigned a matching zone code, however
this was determined on the basis of where the midpoint of the composite was
located. It should be noted that because the most recent topographic survey
did not match drill hole collar elevations exactly, the surface was adjusted
(lowered by 24.2m) to account for the average difference in elevation between
the older collar surveys and the new topographic survey. Consequently, elevations
for individual collars as well as down hole positions of assays, composites
and logged lithological units may be slightly above or below the adjusted surfaces.
To insure that the drill hole composite codes matched the lithological units
in the drill logs, the composites were coded for the bedrock and surface interfaces
according
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to the original surveys. Prior to completing any future updates,
the discrepancies between the new topographic surface and the old surveys should
be investigated further and adjustments made to the collar surveys and/or the
new surface so both match. Table 21 provides a list of the zone codes utilized
for blocks and composites.
Table 21 Block and Composite Codes
|
Zone/Domain
|
Block
|
Composite
|
Central Hanging Wall
Central Footwall
Central Post/Weak Mineral Intrusives
Southwest
|
201
202
300
210
|
201
202
309,311
210
|
Subsequent to zone and percentage designations, several test grade interpolation
passes were completed utilizing various search criteria to examine the impact
on the model continuity. Ultimately, search dimensions were chosen which allowed
most blocks in the denser drilled areas within the zone boundaries to be interpolated
but restricted the interpolation to a relatively close distance beyond the periphery
of the drilling and the bottom of the holes. Grade interpolation was completed
in two passes for each zone or domain, with the initial pass utilizing search
dimensions along the major and intermediate axes approximately double that of
the final search. This approach was taken in order to provide better localized
estimates in areas within close proximity of drill intercepts or denser drilling
while allowing the search to be expanded to utilize more data in areas of sparser
drilling. The pass with the larger search dimensions was completed first as
each successive pass replaces the values contained in each block with the new
estimates. The blocks outside the search dimensions used in the second pass
were left as interpolated in the primary larger search.
The shorter search utilized a maximum search distance from
each block centroid to any given matching grade composite within the zone being
interpolated equal to two-thirds the modeled copper variogram ranges along each
axis. The maximum distance along the major and intermediate axes to accept data
was doubled in the broader search, although the distance to the closest sample
was limited to 100% of the variogram range. The distance along the minor axis,
which is usually cross-structure, was kept at two-thirds the variogram range
in the broader search to prevent interpolation of block grades too far below
the bottom of the drill holes. No values were assigned to blocks located at
a distance greater than the full variogram range from the closest composite
sample or when the search failed to find a second drill hole with matching composites
at a distance less than four-thirds the range from the block centroid.
Search parameters used in the final grade model are summarized
in Table 22. A minimum of 6 composites was used to interpolate block grades
while the upper limit was set at 18. The maximum number of composites per drill
hole was set at 3, insuring that at least 2 drill holes and potentially 6 or
7 maximum were used to interpolate grades into each block. The former was set
in order to prevent undue influence from a single drill hole in areas were drilling
was sparse, while the latter limited model smear, a feature
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inherent to all weighting methods. Placing a limit on the
minimum number of composites can lead to situations where blocks between drill
holes are interpolated while blocks adjacent to and within very close proximity
of the same intercepts are left uninterpolated. The model was reviewed in detail
subsequent to final interpolation to ensure that this was not the case with
Galore Creek. In the denser drilled areas of the Central Zone, the search envelope
was sufficient in most cases to incorporate the maximum number of composites
allowable in the grade interpolations.
Table 22 Search Parameters
|
Zone
|
Search Orientation
Rotation/Plunge/Dip
(Degrees)
|
Maximum Distance to Accept Data Closest/Farthest
(m)
|
|
Major
|
Intermediate
|
Minor
|
|
Pass 1
|
Pass 2
|
Pass 1
|
Pass 2
|
Pass 1
|
Pass 2
|
Central HW
Central FW
Post/Weak
Southwest
|
N28E/-10N/-05E
N17E/-34S/-15W
N28E/-10N/-05E
N30E/-60S/0
|
193/258
208/278
193/258
179/240
|
129/129
139/139
129/129
120/120
|
76/102
88/118
76/102
155/206
|
51/51
59/59
51/51
103/103
|
73/109
47/71
73/109
31/47
|
73/73
47/47
73/73
31/31
|
Copper, gold and silver grades were interpolated by ordinary
kriging, utilizing the variogram models discussed in Section 17.7. While the
weighting of samples was based on individual variograms for each metal and zone,
the search logic was based on the copper variograms to insure that grades were
assigned to each of the three metals if a block was interpolated. Where a block
which fell within the interpolation boundaries of a zone also contained a portion
of the post/weak mineral intrusives, grades were estimated for both based on
their corresponding composites. Other items stored or interpolated included
kriging variance, distance to the closest composite, number of composites and
number of drill holes used in each interpolation. Only those blocks contained
at least partly within the zone boundaries received a grade estimate and only
those composites with matching zone codes were used in the interpolation.
17.10
Mineral Resource Estimate
Estimates of indicated and inferred resources resulting from
the application of the procedures outlined in the previous sections are contained
in the following tables. Table 23 and Table 24 show a breakdown of the resource
by zone while Table 20 and Table 21 provide a tonnage/grade distribution at
increasing cutoff values. Further detail can be found in Appendix 23.3.
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Table 23 - Indicated Resource @ 0.5% Cu Eq Cutoff
|
Zone
|
Tonnes
x 1,000
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
Central HW
Central FW
Central Post/Weak
|
205,018
41,308
5,063
|
1.08
0.84
0.82
|
0.77
0.67
0.53
|
0.39
0.21
0.35
|
5.90
6.15
5.37
|
Central
Southwest
|
251,389
34,537
|
1.04
1.41
|
0.75
0.59
|
0.36
1.04
|
5.93
3.69
|
|
Total Indicated
|
285,926
|
1.08
|
0.73
|
0.44
|
5.66
|
Table 24 Inferred Resource @ 0.5% Cu Eq Cutoff
|
Zone
|
Tonnes
x 1,000
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
Central HW
Central FW
Central Post/Weak
|
54,241
14,278
1,215
|
0.86
0.73
0.69
|
0.63
0.59
0.48
|
0.30
0.14
0.22
|
5.16
6.54
6.34
|
Central
Southwest
|
69,734
29,083
|
0.83
0.85
|
0.61
0.37
|
0.26
0.63
|
5.46
3.28
|
|
Total Inferred
|
98,816
|
0.83
|
0.54
|
0.37
|
4.82
|
The resource is reported using copper equivalent cutoff values that have been
calculated by estimating the net smelter return for gold and silver and allocating
the revenue as if it generated from copper alone. The selected cutoff of 0.5%
equivalent copper (Cu Eq) represents a net value of about US$10 per tonne based
on the assumed prices, metallurgy and smelter terms. Appropriate recoveries,
deductions, treatment/refining charges (TC/RC's) and freight have been applied
in the determination of these revenues as well as the back calculation of equivalent
copper grade. Copper, gold and silver prices used in calculations were US$0.90
per pound, US$375 and US$5.50 per ounce respectively. TC/RC's and freight charges
are based on projections of long-term industry averages. In simple terms, the
calculation is as follows:
Cu Eq %= Cu% + (NSR Au US$ + NSR Ag US$)/(NSR
Cu US$ per %Cu)
Assumed process recoveries and smelter terms used in these
calculations are summarized in Table 25 and Table 26.
Although a distribution of tonnage and grade at increasing
equivalent cutoff values is provided in Table 27 and Table 28, caution is advised
with respect to the use of this information. At the selected cutoff of 0.5%
equivalent copper, the resource is, for the most part, continuous and contiguous
within the limits of the search parameters set. In applying higher cutoff values
the reported blocks can become separate and disperse and may not represent an
inventory that is potentially mineable.
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Table 25 Process Recoveries, Cu Eq Calculations
|
Zone
|
Assumed Process Recovery
|
|
Central:
|
Cu R%=(%Cu-6.5)/%Cu; Min 50%, Max 95%
Au R%=(AuG/T-0.14)/AuG/T; Min 30%, Max 80%
Ag R% =80
|
|
Southwest:
|
Cu R%=(%Cu-8.0)/%Cu; Min 50%, Max 90%
Au R%=(AuG/T-0.27)/AuG/T; Min 30%, Max 80%
Ag R% =55
|
Table 26 Treatment & Refining, Cu Eq Calculations
|
Item
|
Value
|
Concentrate Grade Cu%
TC/RC US$/lb
Freight US $/lb
Cu Payable %
Au Payable %
Ag Payable %
Au Refining US$/oz
Ag Refining US$/oz
|
30
0.192
0.128
96.7
93
90
5.50
0.40
|
In the reporting of blocks residing partly within the boundary,
a block percentage is applied to the block tonnes. Tonnage calculations are
based on a specific gravity of 2.49 for broken rock and a linear formula for
massive rock based on the copper content. The latter was derived from regression
analyses of a database of density measurements compiled in the early 1990's.
SG=2.62+0.0883*Cu%; minimum 2.65, maximum
2.75
For example:
|
|
at 1%Cu
|
SG=min(2.75,2.62+1*0.0883)=min(2.75,2.708)=2.71
|
|
|
|
at 2%Cu
|
SG=max(2.75,2.62+2*0.0883)=max(2.75,2.797)=2.75
|
|
|
|
at 0.1%Cu
|
SG=min(2.65,2.62+0.0883*.1)=min(2.65,2.629)=2.65
|
|
Based on these calculations, a 25x25x12 metre block with a
block percentage of 100 would contain 18,675 tonnes (2.49 SG) for broken rock
and 19,875 (2.65 SG) to 20,625 tonnes (2.75 SG) for massive rock.
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Table 27 - Indicated Resource @ Increasing Cutoff Values
|
Cutoff Value
Cu Eq%
|
Tonnes
x 1,000
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.50
|
537,891
481,845
431,531
387,608
350,134
316,719
285,926
235,759
196,140
162,919
136,037
113,445
96,201
81,953
70,002
51,650
|
0.73
0.79
0.85
0.91
0.96
1.02
1.08
1.20
1.31
1.42
1.54
1.66
1.76
1.87
1.98
2.19
|
0.50
0.54
0.58
0.62
0.66
0.70
0.73
0.80
0.86
0.92
0.97
1.02
1.07
1.12
1.15
1.23
|
0.29
0.31
0.34
0.36
0.39
0.41
0.44
0.49
0.55
0.62
0.68
0.76
0.83
0.91
0.99
1.15
|
3.96
4.28
4.60
4.89
5.17
5.42
5.66
6.10
6.49
6.83
7.12
7.39
7.63
7.80
7.96
8.25
|
|
Table 28 - Inferred Resource @ Increasing Cutoff Values
|
Cutoff Value
Cu Eq%
|
Tonnes
x 1,000
|
Cu
Eq%
|
Cu%
|
Au
G/T
|
Ag
G/T
|
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.50
|
343,061
277,052
220,522
174,144
140,637
116,879
98,816
70,258
53,130
39,594
30,915
23,430
17,831
13,595
10,371
5,843
|
0.46
0.52
0.58
0.65
0.72
0.78
0.83
0.95
1.05
1.16
1.25
1.35
1.44
1.53
1.62
1.81
|
0.31
0.35
0.39
0.43
0.48
0.51
0.54
0.61
0.67
0.73
0.78
0.83
0.87
0.91
0.94
0.96
|
0.21
0.24
0.27
0.29
0.32
0.35
0.37
0.42
0.47
0.51
0.55
0.60
0.66
0.71
0.77
0.93
|
2.75
3.11
3.50
3.91
4.26
4.57
4.82
5.25
5.65
6.12
6.34
6.64
6.84
7.01
7.11
7.12
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While a direct comparison with previous historic estimates
is not possible, Table 29 and Table 30 provide estimates of current grades and
tonnes using the net copper equivalent cutoff values as calculated by Mine Reserves
Associates, Inc. (MRA) in their 1992 estimates (see Section 6.1 Historical Resource
Estimates). Table 29, which is stated at a net equivalent copper cutoff of 0.25%,
is roughly equal to MRA's estimate referred to in Section 6.1 in terms of overall
tonnage but grades in the indicated category are higher in the current estimate.
This is, in part, due to the smaller composite and block size, which imparts
a higher degree of resolution than the previous estimates. Gold grades in the
inferred category are lower as the Southwest Zone represents a smaller proportion
of the total than previous estimates.
Table 29 - Estimated Resources @ MRA 0.25% Net Cu Eq Cutoff
|
Zone
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
|
x 1,000
|
|
|
|
|
|
Indicated
|
336,633
|
0.78
|
0.68
|
0.39
|
5.19
|
|
Inferred
|
128,023
|
0.54
|
0.50
|
0.33
|
4.28
|
Note:
Cu Eq values here are net of process recovery
and smelter deductions
Table 30 provides estimates of current resources using a 0.4%
"MRA" equivalent, which approximates the tonnes contained in the Kennecott "in-pit"
resource also cited in Section 6.1. The current inventory is about 7% higher
in contained copper than the "Kennecott" resource for the indicated category
however the current estimates are not restricted to the those resources within
the pit outline.
Table 30 - Estimated Resources @ MRA 0.40% Net Cu Eq Cutoff
|
Zone
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
|
x 1,000
|
|
|
|
|
|
Indicated
|
247,600
|
0.95
|
0.79
|
0.47
|
5.95
|
|
Inferred
|
72,480
|
0.72
|
0.62
|
0.40
|
5.17
|
Note:
Cu Eq values here are net of process recovery
and smelter deductions
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17.11
Mineral Resource Classification
The distribution of resources between the indicated and inferred
categories is summarized in Table 27 and Table 28 while further detail can be
found in Appendix
23.3
.
It is believed that this classification
conforms well to the CIM Standards on Mineral Resources and Reserves. The division
between indicated and inferred resources is based on the observed geologic continuity
of the Galore Creek mineral zones coupled with variogram data which demonstrated
that a relationship between grade samples exists up to distances exceeding 200
metres along the major axis. Those resources classified as indicated generally
fall within areas of the deposit where drill spacing meets the criteria outlined
in Table 31. This coincides with a maximum distance from each block centroid
to any given grade composite within the zone being interpolated equal to two-thirds
the variogram ranges for copper along each axis. For the inferred resource,
these distances have been increased to the full variogram range for the closest
sample although data has been accepted up to double the distances used for indicated
along the major and intermediate axes. The range along the minor axis, which
is usually cross-structure, has been left the same as for indicated to prevent
inclusion of blocks too far below the bottom of the drill holes. These parameters
are essentially identical to the multiple pass interpolation search strategy
discussed in Section 17.9. Those blocks interpolated during the more-restricted
second search have been classified as indicated while those blocks outside this
area which were interpolated during the initial larger search have been classified
as inferred.
Table 31 Resource Classification Scheme
|
Zone
|
Axis Orientation
Rot/Plunge/Dip
(Degrees)
|
Maximum Distance to Accept Data Closest/Farthest (m)
|
|
Indicated
|
Inferred
|
|
Major
|
Inter-
mediate
|
Minor
|
Major
|
Inter-
mediate
|
Minor
|
Central HW
Central FW
Post/Weak
Southwest
|
N28E/-10N/-05E
N17E/-34S/-15W
N28E/-10N/-05E
N30E/-60S/0
|
129/129
139/139
129/129
120/120
|
51/51
59/59
51/51
103/103
|
73/73
47/47
73/73
31/31
|
193/258
208/278
193/258
179/240
|
76/102
88/118
76/102
155/206
|
73/109
47/71
73/109
31/47
|
Consequently, the indicated category is co-incident with that
area of the deposit that is drilled on a spacing equal to or less than double
the search distances outlined in Table 31 and incorporates those blocks located
along the periphery of the drilling which were assigned grade values at distances
equal to or less than the search range (two-thirds the variogram range). The
inferred category contains primarily fringe blocks that are located equal to
or less than the stipulated search distances from the closest and farthest samples
but greater than the maximum allowed for indicated. This is equivalent to a
drill spacing twice that for indicated along the major and intermediate axis
however in practice, most blocks classified as inferred are located external
to the drilled area within the maximum search ellipsoid rather than between
samples.
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Although the resource classification is based primarily on
a statistical accumulation using composite distance as a cut-off between indicated
and inferred, the distribution of indicated and inferred blocks was carefully
reviewed to ensure that this procedure did not result in the mixing of the two
categories within a given area. 3D shells of the boundaries for indicated and
inferred were generated from block data and the shells edited to exclude isolated
blocks of indicated and/or inferred outside the margins of the main envelopes
as well as repatriate a few isolated blocks of inferred located inside indicated
shells. For the most part, the deposit is drilled on a spacing less than the
maximum set for the indicated category and as such, the area within the bounds
of the drilling is classified mostly as indicated, while the margins have been
designated as inferred. Correspondingly, those areas of the model classified
as indicated utilized data from which at least some statistical interrelationship
existed between sample points. Outside or below this boundary, data is too widely
spaced to assume continuity of grade and structure. The average distance from
each block centre to the closest composite (adjusted to the long axis based
on anisotropy) was 48 metres for indicated and 122 metres for inferred.
None of the mineral resource is classified as measured. It
is believed that in addition to reducing the overall drill spacing to that recommended
in Section 17.8, more extensive sampling of precious metals and confirmation
through more bulk sample testing will be required to warrant upgrading any portion
of the resource to measured. There has been no mining experience with the deposit
and it would be premature to assume that the level of confidence associated
with "measured" can be applied to these mineral resources without further work.
While necessary to formulate detailed mine plans for production,
it is not advised that any additional drilling be completed in the area of the
indicated resource at this time to upgrade it to measured. A limited program
designed to upgrade inferred resources along the peripheries of the existing
zones as well as determine their full vertical and lateral extent could be considered
as an addendum to the recently completed program. In particular, the full down-plunge
and lateral extent of the Southwest Zone has yet to be defined and several holes
would probably help in this regard. Efforts to advance the project would be
better served by investigating the identified mineral potential along strike
and down dip from known mineralization and in other areas within close proximity.
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18
O
THER
R
ELEVANT
D
ATA
AND
I
NFORMATION
18.1
Geotechnical Studies
During 1967 a series of geotechnical studies on overburden,
bedrock, massive (intact) rock and reservoir slope stability were completed
by Golder, Brawner & Associates (GBA). In summary, the findings indicated
initial design parameters for pit slopes in the range of 30 to 34 degrees for
overburden, 40 degrees for bedrock and 42 to 56 degrees for massive rock In
areas where the structure dipped into the potential pit area, such as the moderate
west-dipping post-mineral intrusives, slopes would have to be designed so as
to not to exceed the indicated dip angles.
In 1991 a proposal for a 7-hole triple-tube oriented core
drilling program was made for the potential pit area, but never implemented.
However a geotechnical study was carried out by T. Heah the same year. A total
of 381 structural measurements were collected from cliff faces in the northwestern
part of the Central Zone. Particular attention was paid to fractures steeper
than 30° (the assumed dry friction angle), which dip easterly. In addition,
exposed, easterly-dipping fractures were also noted. Lastly, the presence of
faults, possible release surfaces, and major groundwater seeps were recorded.
Rock hardness was also tested.
Assuming dry conditions, a friction angle of 30° and totally
planar joint surfaces, it was estimated that the maximum stable angle for a
pit slope trending north-south was between 28° and 40°. Probable hazards
mentioned included toppling failure along steep, northerly and northeast-trending
fractures and sub-horizontal release surfaces. Rock fall hazard was considered
to be moderate to high.
18.2
Environmental Studies
Norecol Environmental Consultants Ltd. was engaged to conduct
baseline environmental studies in 1991/1992. The program involved three site
visits to the property by Norecol, water quality sampling, climate and hydrology
data collection, wildlife observations and acid base accounting. Camp personnel
collected baseline hydrology information at West Fork Creek and climate information
at the camp during the exploration program (June through October 1991).
Galore Creek acid-base accounting was conducted on the coarse
reject samples provided by Min-En in Smithers. The Galore Creek rocks contain
a significant amount of gypsum which shows up as sulphur or sulphate. As a result,
total sulphur is very misleading as an indicator of potential acidity because
gypsum is not acid generating. Therefore, total sulphur and sulphur in the form
of sulphide were used to estimate potential acidity. Sulphur in the form of
sulphide is expected to give a better indication of acid generation potential.
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The NPR(s) (ratio of neutralization potential to potential
acidity due to sulphur as sulphide minerals) is preferred for predicted acid
generation potential. If NPR(s) are less than 1, the rock is a potential acid
producer. If NPR(s) are greater than 1 and less than 3, the rock is a marginal
potential acid producer with the region between 1 and 2 considered the most
uncertain.
The syenite megaporphyry from the central zone appears to
be a potential acid consumer. Sulphide content was low (<0.4% sulphur). NPR(s)
was 2.68 in one sample, but greater than 3 in the remaining samples. One sample
of syenite porphyry was similar to the megaporphyry.
Results for other units suggest a greater and varied potential
for net acid generation (several examples of NPR(s)<2). Where copper grade
exceeded 0.4% (potential ore), the NPR(s) tended to be greater than 1 (3 out
of 4 samples), implying a low potential for acid generation. The highest acid
generating potential (NPR(s)<1) appears to be in the poorly mineralized volcanic
rocks.
In early 2004, SpectrumGold retained Rescan Environmental
Consultants (Vancouver, BC) to begin a comprehensive program of baseline environmental
studies for the Galore Creek site, regional waterways, and potential access
corridors. The scope of work is extensive and will include the characterization
of the acid generation and metals leaching characteristics of the rock in and
around the Central and Southwest Zones. In addition, SpectrumGold has initiated
its Environmental Assessment Process in British Columbia and is currently consulting
with Provincial and Federal agencies regarding the Terms of Reference for its
Environmental Assessment report.
18.3
Proposed Power and Access Routes
Road access and power will be key design components in mine
planning for the Galore Creek deposit. Numerous possible access routes and power
scenarios have been proposed for the project in previous studies. These included
on-site power, an intertie to the BC Hydro grid and a several different approaches
using road or tunnel access. In Kennco's last studies, road access and power
accounted for just over half of the total capital cost for the project of US$387
million for a mine processing 29,000 tonnes per day.
An Economic Assessment Report focused on the development of
the Central and Southwest Zones is expected to be complete by mid-2004. This
study will provide updated development concepts, capital and operating costs,
and will consider two access alternatives. Both options contemplate an intertie
with the BC Hydro grid and concentrate shipment via the BC port of Stewart.
The Northernmost access corridor being studied would extend from the Galore
Creek valley almost due east along the More Creek drainage to intersect BC Highway
37 near Bob Quinn. A new road distance of approximately 80 kilometres as well
as a tunnel for ore conveyance and access into the
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Galore Valley would have to be constructed should this option
be selected. The Southern access corridor being examined would commence at the
Galore Creek Valley, parallel the Stikine River south to the mouth of the Iskut
River, and follow the Iskut in an easterly direction to connect with the existing
Eskay Creek Mine road. This alternative would require approximately 150 kilometres
of new road construction. Extensive field environmental and geotechnical investigations
for both access options is planned for the 2004 field season.
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19
I
NTERPRETATION AND
C
ONCLUSIONS
Over the years, a number of resource estimates for the Galore
Creek deposits have been produced by various authors. More recent studies have
focussed on exploiting resources in the Central and Southwest Zones by surface
methods, with production rates ranging from 30,000 to 60,000 tonnes per day.
Commensurate with this emphasis, a number of historic mineral resource estimates
exist, the most recent of which was based on a model completed for the Central
and Southwest Zones in 1992 by Mine Reserve Associates, Inc. (MRA) on the behalf
of Kennecott.
Updated estimates for mineral resources contained within the
Central and Southwest Zones were completed by Hatch/AMCL in collaboration with
NovaGold/Spectrum in April 2004. These estimates incorporate information from
the most recent round of drilling completed in October 2003 as well as having
the benefit of a revised interpretation. The following interpretation and conclusions
are made regarding these updated estimates:
|
1.
|
The current estimates by Hatch/AMCL are based on
a 3-dimensional computer block model with grades interpolated into individual
blocks within a geological framework utilizing ordinary kriging. The authors
have estimated an indicated mineral resource of 286 million tonnes grading
0.73% copper, 0.44 grams gold and 5.7 grams silver per tonne which has
been calculated by estimating the net smelter return for gold and silver
and allocating the revenue as if it generated from copper alone. The selected
cutoff represents a net value of about US$10 per tonne based on the assumed
prices, metallurgy and smelter terms. Copper, gold and silver prices used
in calculations were US$0.90 per pound, US$375 and US$5.50 per ounce respectively.
Specific gravities used for tonnage estimates range from 2.0 for glacial
till to 2.49-2.75 for volcanics and intrusives.
|
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2.
|
An additional resource of 99 million tonnes grading
0.54% copper, , 0.37 grams gold and 4.8 grams silver per tonne has been
estimated. This resource, which for the most part lies below and contiguous
to the indicated resource within the same geological framework, is classified
as inferred. The reporting cutoff is identical to that used for the indicated
mineral resource.
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3.
|
It is believed that the stated resource classifications
conform well to the CIM Standards on Mineral Resources and Reserves. The
quality and density of sample information, knowledge regarding the continuity
of mineralization within various geological units as well as any limits
that the structural framework has imposed on the resource have all been
considered carefully in setting the guidelines. The Central Zone is drilled
from surface down to about 450 metres depth on an approximate spacing
of 50 to 100 metres north-south and 50 metres east-west. Below this, as
well as on the extremities, the drill density is much less. This change
in drilling density coincides roughly with the change in classification
from indicated to inferred. While the drill spacing in Southwest Zone
is substantially less, the density is still sufficient
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near surface and at the core of the deposit to allow
approximately 60% of the tonnage to be classified as indicated. The geological
and structural framework has served to limit the extent of each category
further.
|
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4.
|
While a direct comparison with previous historic
estimates is not possible, estimates of current grades and tonnes using
similar cutoff values do not appear to differ materially from estimates
by MRA.. The updated estimates are similar to MRA's estimate referred
to in Section 6.1 in terms of overall tonnage and metal content but grades
in the indicated category are higher in the current estimate. This is,
in part, due to the smaller composite and block size, which imparts a
higher degree of resolution than the previous estimates. Gold grades in
the inferred category are lower as the Southwest Zone represents a smaller
proportion of the total than previous estimates.
|
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5.
|
Significant quantities of higher grade resources
exist as subsets within the above stated mineral resource. In particular,
near surface inventories in the Southwest Zone and the southern and middle
portions of the Central Zone contain relatively large tonnages of resources
exceeding 1% equivalent copper. In some cases this may not represent material
which can be exploited without inclusion of some lower grade resources
or internal waste however there is potential to exploit these resources
early in the mine life to provide enhanced project cash flows should a
favourable production decision be made.
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20
R
ECOMMENDATIONS
|
1.
|
None of the mineral resource is classified as measured.
It is believed that in addition to reducing the overall drill spacing
to that recommended below, more extensive sampling of precious metals
and confirmation through more bulk sample testing will be required to
warrant upgrading any portion of the resource to measured. There has been
no mining experience with the deposit and it would be premature to assume
that the level of confidence associated with "measured" can be applied
to these mineral resources without further work.
|
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2.
|
In order to classify any portion of the Central
Zone as measured, a final staggered pattern of about 100 to 130 metres
along strike and 45 to 60 metres across the zone is recommended. In most
areas, the drill density in the Central Zone already exceeds this level.
At depth and along the extremities, this would have to be supplemented
by more holes on the existing drill sections. For measured resources in
the Southwest Zone, the drilling program should be designed to intercept
the dipping structure on a 90 to 120 metre (dip direction) by 70 to 100
metre (strike) staggered grid in the plane of the structure. This can
be achieved by holes collared on surface 45 to 60 metres apart north-south
and 70 to 100 metres east-west and drilled -60 degrees toward N30E. The
minimum recommended spacing for conversion of inferred resources to indicated
is twice that detailed above for measured.
|
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3.
|
While necessary to formulate any detailed mine plans
for production, it is not advised that any additional drilling be completed
in the area of the indicated resource at this time to upgrade it to measured.
A limited program designed to upgrade inferred resources along the peripheries
of the existing zones as well as determine their full vertical and lateral
extent could be considered as an addendum to the recently completed program.
In particular, the full down-plunge and lateral extent of the Southwest
Zone has yet to be defined and several holes would probably help in this
regard. Efforts to advance the project would be better served by investigating
the identified mineral potential along strike and down dip from known
mineralization and in other areas within close proximity of the Central
and Southwest Zones.
|
|
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4.
|
Investigation of the relatively untested area between
the Southwest Zone and the Central Zone should be a priority as identifying
mineralized material in this area would support efficient mine design,
increase resource tonnage available, and could reduce estimated stripping
requirements. Based on a review of the block model, it appears that the
potential also exists to identify additional higher grade mineralization
along strike to the North of the Central Zone and to the east of the Southwest
Zone.
|
|
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5.
|
Given the scale and confidence level of the existing
Central and Southwest zone resource, regional exploration, where undertaken,
should prioritize higher-grade, near surface targets that may be mined
early in the project life, thus supporting favorable project returns.
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|
6.
|
The last in-depth technical and economic review of the Galore Creek Project
was completed by Kennecott in 1994. While estimates of mineral resources
contained within the Central and Southwest Zones have not changed materially,
the size and quality of the resource warrants further review. Advances in
technology coupled with changes in market conditions, the political and
socioeconomic climate may well impact the project outlook.
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This report, 3PN01r1 - Update on Resources, Galore Creek Project, British
Columbia, has been prepared by:
A
SSOCIATED
M
INING
C
ONSULTANTS
L
TD
.
Peter A. Lacroix, P. Eng.
Principal Mining Consultant
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21
R
EFERENCES
Aiken, J.D. (1959); Atlin Map-area, British Columbia,
Geological
Survey of Canada
, Memoir 307, 89 Pages.
Allen, D.G. (1966); Mineralogy of Stikine Copper's Galore
Creek Deposits, Unpublished MSc Thesis UBC, 38 Pages.
Allen, D.G., Panteleyev, A. and Armstrong, A.T. (1976); Galore
Creek, in
Porphyry Deposits of The Canadian Cordillera
, A Sutherland
Brown, Editor, CIM Special Volume 15, Pages 402-414.
Anderson, R.G. (1984) ; Late Triassic and Jurassic Magmatism
Along The Stikine Arch and the Geology of the Stikine Batholith, North Central
British Columbia,
Geological Survey of Canada
, Paper 84-1A, Pages 67-73
Barr, D.A. (1966); The Galore Creek Copper Deposits,
CIM Bulletin
, Vol.59,
Pages 841-853
Barr, D.A. (1998); Galore Creek Access Routes,
Kennecott
Corporation internal report
Beane, R.E. (1982); Hydrothermal Alteration in Silicate Rocks:
Southwestern North America, in
Advances in Geology of the Porphyry Copper
Deposits
, Southwestern North America, Spencer R. Titley, Editor, Pages 117-138
Best, M.G. (1982); Igneous and Metamorphic Petrology Pages
37-38
Bradshaw, B.A. (1968); 1966-1967 Geology and Ore Reserves,
Galore Creek Project, Liard M.D., B.C.,
Internal Report
.
de Rosen-Spence, A. (1985); Shoshonites and Associated Rock
of Central British Columbia,
B.C. Ministry of Mines and Petroleum Resources
,
Paper 1985-1, Pages 426-442.
Einaudi, M.T. (1982); General Features and Origin of Skarns
Associated With Porphyry Copper Plutons: Southwestern North America, in
Advances
in Geology of the Porphyry Copper Deposits
, Southwestern North America,
Spencer R. Titley, Editor, Pages 185-210
Enns, S.G., Thompson, J.F.H, Stanley, C.R. and Yarrow, E.W
(1995); The Galore Creek porphyry copper-gold deposits, Northwestern British
Columbia, in
'Porphyry Copper Deposits of the Northern Cordillera'
. ed.
by Schroeter, T., Canadian Institute of Mining and Metallurgy Special Volume
46, Paper No. 46, Pages 630-644.
Fluor Daniel Wright Ltd.(1994); Project Review Galore Creek
Property Oct. 1994,
Kennecott Corporation internal report
Golder, Brawner & Associates; February to October, 1967;
Preliminary Stability Appraisal: Overburden; Bedrock; Massive Rock; Resevoir
.
Reports (4) to Kennco (Stikine) Limited
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3PN01 - Update on Resources Galore Creek Project, British
Columbia
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Page 79
|
Heah, T. (1991); 1991 Preliminary Surface geotechnical data,
Kennecott Corporation internal report
Inman, J. (1992); Geophysics at Galore Creek,
Internal
Kennecott Memorandum
McAusland, J.H., (1967); Underground Development and sampling
at Galore Creek during the fall and winter of 1966-67,
Kennecott Corporation
internal report
Mortensen, J.K., Ghosh, D. and Ferri, F., 1995. U-Pb age constraints
of intrusive rocks associated with copper-gold porphyry deposits in the Canadian
Cordillera in
Porphyry Copper (± Au) Deposits of the Alkalic Suite
Paper 46
, CIM Special Volume 46, Pages 142-158.
Jeffery, W.G. (1965); Galore Creek (Stikine Copper Limited),
B.C. Minister of Mines, Annual Report
, 1964, Pages 19-40.
Kerr, F.A. (1948); Lower Stikine and Western Iskut River Areas,
B.C.;
Geological Survey of Canada
, Memoir 246.
LeMaitre, R.W. (1976); The Chemical Variability of Some Common
Igneous Rocks,
Journal of Petrology
Vol.17.
Logan, J.M. and V.M. Koyanagi (1988); Geology and Mineral
Deposits of The Galore Creek Area, North Western B.C. (104G/3,4), Pages 269-283,
British Columbia Ministry of Energy, Mines and Petroleum Resources
, Geological
Fieldwork, 1988 Paper 1989-1.
Logan, J.M., Victor, M., Koyanagi and Rhys (1989); Geology
and Mineral Occurrences of The Galore Creek Area, NTS 104G/03 and 04,
Province
of British Columbia, Ministry of Energy, Mines and Petroleum
Resources
,
Mineral Resources Division, Geological Survey Branch, Open File 1989-8 (2 sheets).
Malmqvist, L. (1978); Some Applications of the IP Technique
for Different Geophysical Prospecting Purposes,
Geophysical Prospecting
,
Vol.26 Pages 97-121
Mine Reserve Associates, Inc. (1992), Pre-feasibility Mining
Evaluation Galore Creek Project.
Kennecott Corporation internal report
Monger, J.W.H.(1970); Upper Palaeozoic Rocks of Western Cordillera
and Their Bearing on Cordillera Evolution.
Canadian Journal of Earth Sciences
,
Vol. 14, Pages 1832-1859.
Moroney, M.J.(1969) Facts From Figures, Page 422
Panteleyev, A (1975) Galore Creek Map-Area,
B.C. Dept.
of Mines and Petroleum Resources
, Geological Field Work, 1975, In press.
Sillitoe, R.H.(1985); Ore Related Breccias in Volcanoplutonic Arcs.,
Economic
Geology
, Vol 80, 1985, Pages 1467-1514.
Sillitoe, R.H.(1991a); Geological Reassessment of the Galore
Creek Porphyry copper-gold Deposit, British Columbia,
A report prepared for
Kennecott Canada Inc
.
Sillitoe, R.H.(1991b); Further Comments on Geology and Exploration
of the Galore Creek copper-gold Deposit, British Columbia,
A report Prepared
for Kennecott Canada Inc.
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3PN01 - Update on Resources Galore Creek Project, British
Columbia
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Page 80
|
Souther, J.G.(1972); Telegraph Creek Map Area, British Columbia,
Geological Survey of Canada
, Paper 71-44, 38 Pages.
Tipper, H.W., Richard, T.A.(1976); Jurassic Stratigraphy and
History of North-Central British Columbia,
Geological Survey of Canada
,
Bulletin 270, 73 Pages.
White, W.H., Harakal, J.E. and Carter, N.C. (1968) Potassium-Argon
Ages of Some Ore Deposits in British Columbia,
CIM Bulletin
, Vol. 61,
Pages 1326-1334.
Winn, G.C. (1988); Titanium Geophysics: The Application of
Induced Polarization to Sea-Floor Mineral Exploration,
Geophysics
, Vol.53,
Pages 386-401.
Wright Engineers Limited (1974), Stikine Copper Project -
Technical and Economic Study for Hudson Bay Mining and Smelting Co. Limited,
Kennecott Corporation internal report
Yarrow, E.W., Enns, S.G. (April 1992) Progress Report 1991
Galore Creek Project,
Kennecott Corporation internal report
Zurowski, M.T. (1988); Gold Potential of the Galore Creek
Deposit, Stikine River, Liard M.D.,B.C.,
Kennecott Corporation internal report
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22
A
DDITIONAL
R
EQUIREMENTS
FOR
T
ECHNICAL
R
EPORTS ON
D
EVELOPMENT
P
ROPERTIES AND
P
RODUCTION
P
ROPERTIES
Although advanced technical and economic studies have been
carried out in the past (Wright Engineers, 1974; MRA, 1992; Fluor Daniel, 1994),
the project is currently considered to be in an advanced exploration stage.
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23
A
PPENDICES
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23.1
Appendix Probability Distribution
Data
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23.2
Appendix Sample Variogram Models
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23.3
Appendix Resource Tabulation
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Mineral Resource Estimate Central Zone HW
Indicated
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
346,758
|
0.77
|
0.56
|
0.28
|
4.21
|
|
0.25
|
316,741
|
0.83
|
0.60
|
0.29
|
4.52
|
|
0.30
|
289,400
|
0.88
|
0.64
|
0.31
|
4.83
|
|
0.35
|
265,766
|
0.93
|
0.67
|
0.33
|
5.10
|
|
0.40
|
244,182
|
0.98
|
0.71
|
0.35
|
5.37
|
|
0.45
|
224,549
|
1.03
|
0.74
|
0.37
|
5.63
|
|
0.50
|
205,018
|
1.08
|
0.77
|
0.39
|
5.90
|
|
0.60
|
172,253
|
1.18
|
0.84
|
0.43
|
6.37
|
|
0.70
|
144,267
|
1.29
|
0.90
|
0.47
|
6.81
|
|
0.80
|
120,023
|
1.40
|
0.97
|
0.53
|
7.22
|
|
0.90
|
100,332
|
1.51
|
1.02
|
0.58
|
7.54
|
|
1.00
|
83,695
|
1.62
|
1.08
|
0.65
|
7.86
|
|
1.10
|
70,568
|
1.72
|
1.13
|
0.71
|
8.13
|
|
1.20
|
60,043
|
1.83
|
1.18
|
0.77
|
8.34
|
|
1.30
|
50,650
|
1.94
|
1.23
|
0.85
|
8.55
|
|
1.50
|
36,836
|
2.14
|
1.32
|
0.98
|
8.93
|
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
161,322
|
0.49
|
0.36
|
0.19
|
2.75
|
|
0.25
|
129,383
|
0.56
|
0.41
|
0.21
|
3.20
|
|
0.30
|
103,815
|
0.63
|
0.46
|
0.23
|
3.70
|
|
0.35
|
86,194
|
0.69
|
0.51
|
0.25
|
4.14
|
|
0.40
|
72,954
|
0.75
|
0.55
|
0.27
|
4.51
|
|
0.45
|
62,564
|
0.81
|
0.59
|
0.28
|
4.86
|
|
0.50
|
54,241
|
0.86
|
0.63
|
0.30
|
5.16
|
|
0.60
|
40,035
|
0.97
|
0.70
|
0.33
|
5.70
|
|
0.70
|
31,240
|
1.06
|
0.77
|
0.37
|
6.20
|
|
0.80
|
24,045
|
1.16
|
0.83
|
0.40
|
6.67
|
|
0.90
|
18,980
|
1.24
|
0.88
|
0.44
|
6.94
|
|
1.00
|
14,535
|
1.34
|
0.93
|
0.48
|
7.23
|
|
1.10
|
10,935
|
1.43
|
0.98
|
0.53
|
7.45
|
|
1.20
|
8,410
|
1.52
|
1.03
|
0.58
|
7.66
|
|
1.30
|
6,302
|
1.61
|
1.06
|
0.65
|
7.74
|
|
1.50
|
3,360
|
1.80
|
1.12
|
0.80
|
7.94
|
|
final
|
Hatch/Associated Mining Consultants Ltd.
|
|
|
June 3,
2004
|
|
3PN01 - Update on Resources Galore Creek Project, British
Columbia
|
Page 102
|
Mineral Resource Estimate Central Zone FW
Indicated
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
107,527
|
0.53
|
0.42
|
0.13
|
3.94
|
|
0.25
|
95,810
|
0.57
|
0.45
|
0.14
|
4.26
|
|
0.30
|
82,610
|
0.61
|
0.49
|
0.16
|
4.66
|
|
0.35
|
70,229
|
0.66
|
0.53
|
0.17
|
5.07
|
|
0.40
|
59,766
|
0.72
|
0.57
|
0.18
|
5.47
|
|
0.45
|
49,770
|
0.78
|
0.62
|
0.20
|
5.85
|
|
0.50
|
41,308
|
0.84
|
0.67
|
0.21
|
6.15
|
|
0.60
|
29,434
|
0.96
|
0.76
|
0.25
|
6.76
|
|
0.70
|
21,934
|
1.07
|
0.84
|
0.28
|
7.22
|
|
0.80
|
16,250
|
1.18
|
0.92
|
0.31
|
7.71
|
|
0.90
|
12,359
|
1.28
|
1.00
|
0.34
|
8.24
|
|
1.00
|
9,140
|
1.41
|
1.08
|
0.37
|
8.85
|
|
1.10
|
7,421
|
1.49
|
1.14
|
0.40
|
9.24
|
|
1.20
|
5,648
|
1.60
|
1.22
|
0.43
|
9.61
|
|
1.30
|
4,609
|
1.68
|
1.27
|
0.46
|
9.84
|
|
1.50
|
2,813
|
1.86
|
1.40
|
0.52
|
10.22
|
Inferred
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
74,970
|
0.39
|
0.32
|
0.09
|
3.17
|
|
0.25
|
60,582
|
0.43
|
0.35
|
0.10
|
3.62
|
|
0.30
|
46,795
|
0.48
|
0.39
|
0.11
|
4.14
|
|
0.35
|
34,814
|
0.54
|
0.43
|
0.11
|
4.79
|
|
0.40
|
25,248
|
0.60
|
0.49
|
0.12
|
5.44
|
|
0.45
|
18,756
|
0.67
|
0.54
|
0.13
|
6.05
|
|
0.50
|
14,278
|
0.73
|
0.59
|
0.14
|
6.54
|
|
0.60
|
8,015
|
0.88
|
0.71
|
0.15
|
7.29
|
|
0.70
|
5,069
|
1.01
|
0.84
|
0.16
|
8.07
|
|
0.80
|
3,439
|
1.14
|
0.98
|
0.15
|
9.16
|
|
0.90
|
2,437
|
1.26
|
1.09
|
0.15
|
9.45
|
|
1.00
|
1,937
|
1.34
|
1.18
|
0.14
|
10.19
|
|
1.10
|
1,494
|
1.43
|
1.27
|
0.14
|
10.80
|
|
1.20
|
1,129
|
1.52
|
1.36
|
0.15
|
10.95
|
|
1.30
|
966
|
1.57
|
1.40
|
0.16
|
10.65
|
|
1.50
|
515
|
1.75
|
1.56
|
0.18
|
11.14
|
|
final
|
Hatch/Associated Mining Consultants Ltd.
|
|
|
June 3,
2004
|
|
3PN01 - Update on Resources Galore Creek Project, British
Columbia
|
Page 103
|
Mineral Resource Estimate CZ Post/Weak Mineral Intrusives
Indicated
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
25,508
|
0.39
|
0.26
|
0.16
|
3.02
|
|
0.25
|
17,513
|
0.47
|
0.32
|
0.19
|
3.60
|
|
0.30
|
12,572
|
0.55
|
0.37
|
0.21
|
4.13
|
|
0.35
|
9,670
|
0.62
|
0.42
|
0.24
|
4.49
|
|
0.40
|
7,421
|
0.70
|
0.47
|
0.28
|
4.82
|
|
0.45
|
6,061
|
0.77
|
0.50
|
0.31
|
5.10
|
|
0.50
|
5,063
|
0.82
|
0.53
|
0.35
|
5.37
|
|
0.60
|
3,861
|
0.91
|
0.57
|
0.39
|
5.88
|
|
0.70
|
2,879
|
1.00
|
0.62
|
0.45
|
6.33
|
|
0.80
|
2,014
|
1.12
|
0.65
|
0.54
|
6.52
|
|
0.90
|
1,356
|
1.25
|
0.67
|
0.66
|
6.94
|
|
1.00
|
809
|
1.46
|
0.67
|
0.92
|
6.10
|
|
1.10
|
563
|
1.65
|
0.66
|
1.15
|
5.74
|
|
1.20
|
429
|
1.80
|
0.68
|
1.34
|
5.25
|
|
1.30
|
358
|
1.91
|
0.64
|
1.52
|
4.83
|
|
1.50
|
240
|
2.18
|
0.67
|
1.81
|
4.91
|
Inferred
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
8,559
|
0.35
|
0.21
|
0.15
|
3.21
|
|
0.25
|
6,125
|
0.40
|
0.25
|
0.16
|
3.64
|
|
0.30
|
4,422
|
0.45
|
0.29
|
0.17
|
4.14
|
|
0.35
|
3,048
|
0.51
|
0.33
|
0.19
|
4.56
|
|
0.40
|
1,940
|
0.60
|
0.40
|
0.21
|
5.08
|
|
0.45
|
1,543
|
0.64
|
0.44
|
0.22
|
5.71
|
|
0.50
|
1,215
|
0.69
|
0.48
|
0.22
|
6.34
|
|
0.60
|
804
|
0.76
|
0.55
|
0.22
|
7.59
|
|
0.70
|
428
|
0.87
|
0.63
|
0.25
|
9.03
|
|
0.80
|
292
|
0.94
|
0.66
|
0.28
|
9.50
|
|
0.90
|
227
|
0.96
|
0.70
|
0.27
|
9.97
|
|
1.00
|
48
|
1.13
|
0.70
|
0.45
|
10.28
|
|
1.10
|
24
|
1.19
|
0.58
|
0.66
|
7.84
|
|
1.20
|
14
|
1.22
|
0.37
|
0.93
|
3.33
|
|
1.30
|
0
|
1.37
|
0.51
|
1.00
|
3.44
|
|
1.50
|
|
|
|
|
|
|
final
|
Hatch/Associated Mining Consultants Ltd.
|
|
|
June 3,
2004
|
|
3PN01 - Update on Resources Galore Creek Project, British
Columbia
|
Page 104
|
Mineral Resource Estimate Central Zone Totals
Indicated
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
479,793
|
0.70
|
0.52
|
0.24
|
4.09
|
|
0.25
|
430,063
|
0.75
|
0.56
|
0.26
|
4.43
|
|
0.30
|
384,582
|
0.81
|
0.60
|
0.27
|
4.77
|
|
0.35
|
345,665
|
0.87
|
0.64
|
0.29
|
5.08
|
|
0.40
|
311,369
|
0.92
|
0.67
|
0.31
|
5.38
|
|
0.45
|
280,379
|
0.98
|
0.71
|
0.33
|
5.66
|
|
0.50
|
251,389
|
1.04
|
0.75
|
0.36
|
5.93
|
|
0.60
|
205,547
|
1.15
|
0.82
|
0.40
|
6.42
|
|
0.70
|
169,079
|
1.25
|
0.89
|
0.45
|
6.86
|
|
0.80
|
138,287
|
1.37
|
0.95
|
0.50
|
7.27
|
|
0.90
|
114,046
|
1.48
|
1.02
|
0.56
|
7.60
|
|
1.00
|
93,645
|
1.60
|
1.08
|
0.62
|
7.94
|
|
1.10
|
78,553
|
1.70
|
1.13
|
0.68
|
8.22
|
|
1.20
|
66,120
|
1.81
|
1.18
|
0.75
|
8.43
|
|
1.30
|
55,616
|
1.91
|
1.23
|
0.82
|
8.63
|
|
1.50
|
39,889
|
2.12
|
1.32
|
0.96
|
8.99
|
Inferred
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
244,851
|
0.46
|
0.34
|
0.16
|
2.90
|
|
0.25
|
196,090
|
0.51
|
0.38
|
0.17
|
3.34
|
|
0.30
|
155,032
|
0.58
|
0.43
|
0.19
|
3.85
|
|
0.35
|
124,056
|
0.65
|
0.48
|
0.21
|
4.33
|
|
0.40
|
100,142
|
0.71
|
0.53
|
0.23
|
4.75
|
|
0.45
|
82,863
|
0.77
|
0.57
|
0.25
|
5.15
|
|
0.50
|
69,734
|
0.83
|
0.61
|
0.26
|
5.46
|
|
0.60
|
48,853
|
0.95
|
0.70
|
0.30
|
5.99
|
|
0.70
|
36,736
|
1.05
|
0.77
|
0.34
|
6.49
|
|
0.80
|
27,776
|
1.15
|
0.84
|
0.37
|
7.01
|
|
0.90
|
21,644
|
1.24
|
0.90
|
0.40
|
7.26
|
|
1.00
|
16,521
|
1.34
|
0.96
|
0.44
|
7.59
|
|
1.10
|
12,454
|
1.43
|
1.02
|
0.49
|
7.85
|
|
1.20
|
9,553
|
1.52
|
1.07
|
0.53
|
8.04
|
|
1.30
|
7,268
|
1.60
|
1.10
|
0.59
|
8.13
|
|
1.50
|
3,875
|
1.80
|
1.18
|
0.72
|
8.37
|
|
final
|
Hatch/Associated Mining Consultants Ltd.
|
|
|
June 3,
2004
|
|
3PN01 - Update on Resources Galore Creek Project, British
Columbia
|
Page 105
|
Mineral Resource Estimate Southwest Zone
Indicated
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
58,098
|
0.97
|
0.41
|
0.73
|
2.86
|
|
0.25
|
51,782
|
1.06
|
0.45
|
0.79
|
3.04
|
|
0.30
|
46,949
|
1.14
|
0.48
|
0.85
|
3.20
|
|
0.35
|
41,943
|
1.24
|
0.52
|
0.92
|
3.36
|
|
0.40
|
38,765
|
1.31
|
0.55
|
0.97
|
3.49
|
|
0.45
|
36,340
|
1.37
|
0.57
|
1.01
|
3.60
|
|
0.50
|
34,537
|
1.41
|
0.59
|
1.04
|
3.69
|
|
0.60
|
30,212
|
1.54
|
0.64
|
1.12
|
3.95
|
|
0.70
|
27,061
|
1.64
|
0.67
|
1.20
|
4.19
|
|
0.80
|
24,631
|
1.73
|
0.71
|
1.26
|
4.37
|
|
0.90
|
21,991
|
1.84
|
0.74
|
1.34
|
4.58
|
|
1.00
|
19,800
|
1.94
|
0.77
|
1.42
|
4.76
|
|
1.10
|
17,648
|
2.04
|
0.81
|
1.50
|
5.00
|
|
1.20
|
15,833
|
2.15
|
0.84
|
1.58
|
5.20
|
|
1.30
|
14,385
|
2.24
|
0.87
|
1.65
|
5.37
|
|
1.50
|
11,762
|
2.43
|
0.93
|
1.81
|
5.72
|
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
98,210
|
0.47
|
0.23
|
0.35
|
2.40
|
|
0.25
|
80,962
|
0.52
|
0.25
|
0.39
|
2.54
|
|
0.30
|
65,490
|
0.58
|
0.28
|
0.44
|
2.68
|
|
0.35
|
50,088
|
0.66
|
0.31
|
0.50
|
2.85
|
|
0.40
|
40,495
|
0.73
|
0.34
|
0.55
|
3.03
|
|
0.45
|
34,016
|
0.79
|
0.36
|
0.59
|
3.15
|
|
0.50
|
29,083
|
0.85
|
0.37
|
0.63
|
3.28
|
|
0.60
|
21,405
|
0.96
|
0.41
|
0.69
|
3.55
|
|
0.70
|
16,394
|
1.05
|
0.44
|
0.76
|
3.75
|
|
0.80
|
11,818
|
1.17
|
0.47
|
0.84
|
4.01
|
|
0.90
|
9,271
|
1.26
|
0.49
|
0.90
|
4.19
|
|
1.00
|
6,909
|
1.37
|
0.51
|
0.98
|
4.36
|
|
1.10
|
5,377
|
1.46
|
0.52
|
1.05
|
4.48
|
|
1.20
|
4,043
|
1.56
|
0.53
|
1.13
|
4.59
|
|
1.30
|
3,103
|
1.66
|
0.55
|
1.20
|
4.74
|
|
1.50
|
1,968
|
1.83
|
0.54
|
1.35
|
4.67
|
|
final
|
Hatch/Associated Mining Consultants Ltd.
|
|
|
June 3,
2004
|
|
3PN01 - Update on Resources Galore Creek Project, British
Columbia
|
Page 106
|
Mineral Resource Estimate Central & Southwest
Zone Totals
Indicated
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
537,891
|
0.73
|
0.50
|
0.29
|
3.96
|
|
0.25
|
481,845
|
0.79
|
0.54
|
0.31
|
4.28
|
|
0.30
|
431,531
|
0.85
|
0.58
|
0.34
|
4.60
|
|
0.35
|
387,608
|
0.91
|
0.62
|
0.36
|
4.89
|
|
0.40
|
350,134
|
0.96
|
0.66
|
0.39
|
5.17
|
|
0.45
|
316,719
|
1.02
|
0.70
|
0.41
|
5.42
|
|
0.50
|
285,926
|
1.08
|
0.73
|
0.44
|
5.66
|
|
0.60
|
235,759
|
1.20
|
0.80
|
0.49
|
6.10
|
|
0.70
|
196,140
|
1.31
|
0.86
|
0.55
|
6.49
|
|
0.80
|
162,919
|
1.42
|
0.92
|
0.62
|
6.83
|
|
0.90
|
136,037
|
1.54
|
0.97
|
0.68
|
7.12
|
|
1.00
|
113,445
|
1.66
|
1.02
|
0.76
|
7.39
|
|
1.10
|
96,201
|
1.76
|
1.07
|
0.83
|
7.63
|
|
1.20
|
81,953
|
1.87
|
1.12
|
0.91
|
7.80
|
|
1.30
|
70,002
|
1.98
|
1.15
|
0.99
|
7.96
|
|
1.50
|
51,650
|
2.19
|
1.23
|
1.15
|
8.25
|
Inferred
|
Cutoff Value
|
Tonnes
|
Cu Eq%
|
Cu%
|
Au G/T
|
Ag G/T
|
|
Cu Eq%
|
x 1,000
|
|
|
|
|
|
0.20
|
343,061
|
0.46
|
0.31
|
0.21
|
2.75
|
|
0.25
|
277,052
|
0.52
|
0.35
|
0.24
|
3.11
|
|
0.30
|
220,522
|
0.58
|
0.39
|
0.27
|
3.50
|
|
0.35
|
174,144
|
0.65
|
0.43
|
0.29
|
3.91
|
|
0.40
|
140,637
|
0.72
|
0.48
|
0.32
|
4.26
|
|
0.45
|
116,879
|
0.78
|
0.51
|
0.35
|
4.57
|
|
0.50
|
98,816
|
0.83
|
0.54
|
0.37
|
4.82
|
|
0.60
|
70,258
|
0.95
|
0.61
|
0.42
|
5.25
|
|
0.70
|
53,130
|
1.05
|
0.67
|
0.47
|
5.65
|
|
0.80
|
39,594
|
1.16
|
0.73
|
0.51
|
6.12
|
|
0.90
|
30,915
|
1.25
|
0.78
|
0.55
|
6.34
|
|
1.00
|
23,430
|
1.35
|
0.83
|
0.60
|
6.64
|
|
1.10
|
17,831
|
1.44
|
0.87
|
0.66
|
6.84
|
|
1.20
|
13,595
|
1.53
|
0.91
|
0.71
|
7.01
|
|
1.30
|
10,371
|
1.62
|
0.94
|
0.77
|
7.11
|
|
1.50
|
5,843
|
1.81
|
0.96
|
0.93
|
7.12
|
|
final
|
Hatch/Associated Mining Consultants Ltd.
|
|
|
June 3,
2004
|
|
3PN01 - Update on Resources Galore Creek Project, British
Columbia
|
Page 107
|
23.4
Appendix Sections of Block Model
& Composites
|
final
|
Hatch/Associated Mining Consultants Ltd.
|
|
|
June 3,
2004
|