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Occurrence Details

Occurrence Number
105D 234
Occurrence Name
Reservoir Lake
Occurrence Type

General Information

Secondary Commodities: copper
Aliases: Whitehorse Copper
Deposit Type(s): Skarn
Location(s): 60.723560 N, -135.164110 W
NTS Mapsheet(s): 105D11
Hand Samples Available at YGS: No


The Whitehorse Copper Belt is located west of Whitehorse and contains 30+ mines, deposits and showings. By 1900, most of the important deposits had been discovered and the first small ore shipment was made that year. 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 Reservoir Lake deposit is present within the Whitehorse batholith hornblende granite. The deposit presents itself as a vein style deposit where bornite is present in very thin veinlets along irregular cracks in the granite and is partly altered to malachite in surface exposures. The granite is generally fresh other than some silicification and development of epidote along fractures.

Location Map

Last Updated: Apr 11, 2019

Work History

Year Work Type Comment
1970 Geochemistry: Soil
1967 Geology: Detailed Bedrock Mapping
1967 Ground Geophysics: EM
1967 Ground Geophysics: Magnetics
1967 Other: Line Cutting

Regional Geology - Terrane

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

Regional Geology - Bedrock

Group/Suite: Whitehorse
Period Max: Cretaceous
Age Max: 112 MA
Period Min: Cretaceous
Age Min: 105 MA
Rock Major: granodiorite/quartz diorite
Rock Minor:
Reference: Hart & Radloff (1990) - YGS OF 1990-4
Geological Unit (1M): mKW
Geological Unit (250K): mKgW

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
092922 1990 Fox 1-16 MC Prospecting, Trenching and Geochemistry Rock - Geochemistry, Detailed Bedrock Mapping - Geology, Prospecting - Other, Backhoe - Trenching
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
060011 1970 Geochemical Survey - Summer 1970 Soil - Geochemistry
018884 1967 Geological Mapping, Magnetometer and Electro Magnetic Survey Detailed Bedrock Mapping - Geology, EM - Ground Geophysics, Magnetics - Ground Geophysics, Line Cutting - Other
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
060011 Geochemical Survey - Summer 1970 Assessment Report
1984-1 The Whitehorse Copper Belt - A Compilation Open File (Geological - Bedrock)
018884 Geological Mapping, Magnetometer and Electro Magnetic Survey Assessment Report

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