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Occurrence Details


Occurrence Number
105D 223
Occurrence Name
Gulch
Occurrence Type
Hard-rock
Status
Showing


General Information

Secondary Commodities: copper
Aliases: Whitehorse Copper
Deposit Type(s): Skarn
Location(s): 60.728420 N, -135.177850 W
NTS Mapsheet(s): 105D11
Location Comments: Georeferenced from open file 1984-1.
Hand Samples Available at YGS: No

Capsule

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 Gulch occurrence is hosted in interbedded limestone intruded by Whitehorse batholith granite. Mineralization of the surrounding skarn deposits (MINFILE occurrence 105D 222) consists dominantly of chalcopyrite, hematite and bornite (Open File 1984-1). 

Location Map

Last Updated: Mar 26, 2021

Work History

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

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 (1997) - YGS GM 1997-5
Geological Unit (1M): uTrAK
Geological Unit (250K): uTrAK2

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
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
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
1984-1 The Whitehorse Copper Belt - A Compilation Open File (Geological - Bedrock)
018884 Geological Mapping, Magnetometer and Electro Magnetic Survey Assessment Report
060011 Geochemical Survey - Summer 1970 Assessment Report
Citations

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