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Occurrence Details


Occurrence Number
105D 204
Occurrence Name
Little Chief
Occurrence Type
Hard-rock
Status
Past Producer


General Information

Primary Commodities: copper, silver, gold
Secondary Commodities: platinum, palladium, gallium
Aliases: Whitehorse Copper
Deposit Type(s): Skarn Cu
Location(s): 60.636110 N, -135.058060 W
NTS Mapsheet(s): 105D11
Hand Samples Available at YGS: Yes

Capsule

The Whitehorse Copper Belt is located west of Whitehorse and contains 30+ mines, deposits and showings. Many of the occurrences in the Copper Belt are skarns. The skarns form on or near the contact between the Whitehorse batholith and the Lewes River group. The Whitehorse batholith is commonly a grey coarse-grained hornblende granite and ranges from quartz monzonite to granodiorite to diorite. The Lewes River group contains numerous different rock types, most importantly of which is the limestone group, which is essential in the formation of skarns in the area. A small number of occurrences within the Copper Belt are vein and/or replacement and occur within the Whitehorse batholith granite.

The Little Chief deposit is within the Hancock member of the Aksala formation in the Lewes River Group. The skarn occurs along the northwest trending contact between the granodiorite and the limestone and the ore is about 600 ft. (182.88 m) along strike and an average of 80 ft. (24.384 m) in width.

The Little Chief mine display features of both endoskarns and exoskarns however, the endoskarn is subordinate to the exoskarn. The skarns of the contact zone developed in three stages: the pyroxene stage; the magnetite-andradite stage; and the serpentine-chlorite-epidote stage. The skarn is believed to have formed between 525-300°C with early contact metamorphic minerals forming in a high CO2 environment and skarn minerals forming in a low CO2 environment. The deposit shows characteristics of both infiltrational and diffusional metasomatic features. The deposit has been described as a bimetasomatic skarn in calcareous rocks onto which an infiltrational skarn has been imposed.

Ore minerals present within the deposit include bornite, chalcopyrite, valeriite and magnetite. Copper mineralization has been intersected at depth to 1430 ft (435.9 m). The Little Chief mine operated between 1967-1982. Total reported production, including ore from the Middle Chief deposit, was 8,536,400 tonnes. The reported grade between 1972-1982 was 1.53 Cu%, 0.75 g/t Au and 9.16 g/t Ag. There are no reported grades for the period from 1967-1971.
 

Location Map

Last Updated: May 10, 2019

Work History

Year Work Type Comment
1973 Geology: Bedrock Mapping
1973 Lab Work/Physical Studies: Petrographic
1973 Pre-existing Data: Research/Summarize
1969 Studies: Feasibility
1967 Drilling: Diamond 21 Drill holes completed
1966 Drilling: Diamond 2 Drill holes completed
1966 Geochemistry: Drill Core
1966 Studies: Feasibility
1965 Geology: Bedrock Mapping
1965 Studies: Feasibility
1964 Drilling: Diamond
1963 Drilling: Diamond 13 Holes completed

Regional Geology - Terrane

Group: Intermontane
Affinity: W Laurentia
Name: Stikinia
Realm: peri-Laurentian


Regional Geology - Bedrock

Supergroup:
Group/Suite: Lewes River
Formation: Aksala
Member: Hancock
Terrane: Stikinia
Period Max: Triassic
Age Max: 217 MA
Period Min: Triassic
Age Min: 204 MA
Rock Major: conglo/limestone/dolostone
Rock Minor: chert
Reference: Hart & Radloff (1990) - YGS OF 1990-4
Geological Unit (1M): uTrAK
Geological Unit (250K): uTrAK2

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
061173 1974 Report on Exploratory Work on Whitehorse Copper Belt Diamond - Drilling, Drill Core - Geochemistry, IP - Ground Geophysics 10 2222.29
060525 1973 [Proposed Surface Drill Programs on the Little Chief-Big Chief-Valerie Properties] Research/Summarize - Pre-existing Data
062018 1973 Preliminary Report on Geological Control to Ore Distribution in the Whitehorse Copper Belt Reverse Circulation - Drilling, Bedrock Mapping - Geology, Petrographic - Lab Work/Physical Studies 665 5555
062228 1969 Feasibility Study for the Underground Development of the Little Chief Orebody Feasibility - Studies
092558 1967 [Drilling of the Little Chief Orebody] Diamond - Drilling 21
062227 1966 An Evaluation of the New imperial Mines Ltd. Feasibility - Studies
091123 1964 Summary of assessment work for 316 claims Diamond - Drilling 46 3652.57

Related References

Number Title Page(s) Document Type
1984-1 The Whitehorse Copper Belt - A Compilation Open File (Geological - Bedrock)
092558 [Drilling of the Little Chief Orebody] Assessment Report
060525 [Proposed Surface Drill Programs on the Little Chief-Big Chief-Valerie Properties] Assessment Report
062227 An Evaluation of the New imperial Mines Ltd. Assessment Report
062228 Feasibility Study for the Underground Development of the Little Chief Orebody Assessment Report
061173 Report on Exploratory Work on Whitehorse Copper Belt Assessment Report
ARMC004893 Magnetic survey map - sheet 460N/610E - Big, Middle & Little Chief and Valerie claims Geophysical Map
ARMC004831 Map sections - 9850 N looking north and 9250 looking north of Arctic Chief and Little Chief Geoscience Map (General)
ARMC004798 Map of geology - Little Chief Geoscience Map (Geological - Bedrock)
ARMC004801 General geology map - North Star and Little Chief Geoscience Map (Geological - Bedrock)
ARMC004828 Map sections - 9850 and 9250 - Arctic Chief and Little Chief Geoscience Map (General)
ARMC004797 Map showing Valerie, Big Chief, Little Chief Geoscience Map (General)
ARMC004793 Exploration composite map - Little Chief Geoscience Map (General)
ARMC004808 Geology geology map - North Star and Little Chief Geoscience Map (Geological - Bedrock)
ARMC004794 Map of Middle Chief and Little Chief ore zones Geoscience Map (General)
ARMC004796 Map of Little Chief to Big Chief - DDH BC 1 to 6 drilled Geoscience Map (Geological - Bedrock)
ARMC004806 General geology map - North Star and Little Chief Geoscience Map (Geological - Bedrock)
Citations
Carriere, J.J., Sinclair, W.D. and Kirkham, R.V., 1981. Copper Deposits and Occurrences in Yukon Territory. Geological Survey of Canada, Paper 81-12.
Green, L H., 1965. The mineral industry of Yukon Territory and southwestern District of Mackenzie 1964. Geological Survey of Canada, Paper 65-19, 94 p.
Kindle, E.D., 1963. Summary of Research: Field, 1962. Geological Survey of Canada, Paper 63-1.
The mineral industry of Yukon Territory and southwestern District of Mackenzie, 1965; Green, L H. Geological Survey of Canada, Paper 66-31, 1966, 145 pages, https://doi.org/10.4095/100943 (Open Access)
The mineral industry of Yukon Territory and southwestern District of Mackenzie, 1966; Findlay, D C. Geological Survey of Canada, Paper 67-40, 1967, 104 pages, https://doi.org/10.4095/100899 (Open Access)
The mineral industry of Yukon Territory and southwestern District of Mackenzie, Northwest Territories, 1963; Godwin, C I; Green, L H. Geological Survey of Canada, Paper 64-36, 1964, 94 pages, https://doi.org/10.4095/101004 (Open Access)

Drill Core at YGS Core Library

Number Property Year Drilled Core Size Photos Data
LC-94 Little Chief 1973 AQ 21 0

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