Find publications, data and maps managed by the
Yukon Geological Survey

Occurrence Details

Occurrence Number
105D 214
Occurrence Name
Occurrence Type

General Information

Primary Commodities: copper
Secondary Commodities: gold, silver, molybdenum
Aliases: Whitehorse Copper
Deposit Type(s): Skarn
Location(s): 60.580730 N, -134.955220 W
NTS Mapsheet(s): 105D10
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 Gem deposit is a skarn located at the contact between the diorite of the Whitehorse batholith and the limestone of the Lewes group. In 1971 reserves calculated totalled 625 044 tonnes at 1.01% Cu.

Location Map

Last Updated: Apr 15, 2019

Work History

Year Work Type Comment
1968 Drilling: Diamond
1968 Geology: Bedrock Mapping
1968 Ground Geophysics: EM
1968 Ground Geophysics: Magnetics

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: quartz monzonite/granite/monzonite/syenite/granodiorite/quartz diorite
Rock Minor: ash
Reference: Wheeler (1961) - GSC Map 1093A
Geological Unit (1M): mKW
Geological Unit (250K): mKqW

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
096680 2014 Summary Report Documenting the Cowley, Keewenaw and Gem Copper Deposits on the Lobo Property Research/Summarize - Pre-existing Data
095193 2008 Drilling and Geophysical Assessment Report on the Whitehorse Copper Belt Project Diamond - Drilling, Drill Core - Geochemistry, IP - Ground Geophysics 21 2134.10
094024 1998 [Geological Report on the Sue,Jim,Ace,Dennis,Gem and Lobo Claims] Rock - Geochemistry, Soil - Geochemistry
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
090945 1970 [Drilling, Stripping and Road Construction on the Whitehorse Copper Belt Project] All Weather Road - Development, Surface, Drifting/Raising - Development, Underground, Diamond - Drilling 5 206.96
091116 1968 [Diamond Drilling on the Gem 1 Claims] Diamond - Drilling 10 950.21

Related References

Number Title Page(s) Document Type
ARMC004838 Longitudinal section map - Gem and Brown Cub Geoscience Map (General)
ARMC004836 Map of Gem claims Geoscience Map (Geological - Bedrock)
ARMC004841 Geology and geophysics map - Chargeability milliseconds - Gem and Keewenaw Geophysical Map
ARMC004839 Geology map - Gem-Keewenaw Geoscience Map (Geological - Bedrock)
ARMC004840 Map showing chargeability contours - 4 m/sec, 20 ppm contour - Gem and Keewenaw Geophysical Map
1984-1 The Whitehorse Copper Belt - A Compilation Open File (Geological - Bedrock)
Carriere, J J, et al. “Copper Deposits and Occurrences in Yukon Territory.” Ottawa: Geological Survey of Canada, 1982., 1981, doi:10.4095/109350.
The mineral industry of Yukon Territory and southwestern District of Mackenzie, 1968; Findlay, D C. Geological Survey of Canada, Paper 69-55, 1969, 71 pages, (Open Access)

Submit Information to Yukon Geological Survey