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Occurrence Details


Occurrence Number
115I 041
Occurrence Name
Carmacks Copper Zone 3
Occurrence Type
Hard-rock
Status
Prospect


General Information

Secondary Commodities: copper, gold, silver
Aliases: Carmacks Cu Zone 3
Deposit Type(s): Porphyry Alkalic Cu-Au
Location(s): 62.360170 N, -136.751930 W
NTS Mapsheet(s): 115I07
Location Comments: Location from georeferenced maps and google earth
Hand Samples Available at YGS: No

Capsule

Work History
 
Staked as Boy cl 1-150 (Y51099) in Mar/70 by A. Arsenault & G. Wing and optioned in July by Dawson Range Joint Venture (Straus Exploration Inc, Great Plains Development Corporation, Marietta Resources International Ltd, Molybdenum Corporation of America and Trojan Consolidated Mines Ltd).
 
The main showing of the Carmacks Copper property (No. 1 zone) was discovered by prospecting by the Dawson Range Joint Venture (DRJV) in Aug/70. The No. 3 zone was discovered by a soil sampling program conducted later that year.
 
In 1971, the DRJV constructed a road to the site and completed line cutting, VLF-EM and ground magnetic surveys over much of the property and drilled 4 shallow holes at the No. 3 zone.

 In 1981, United Keno Hill Mines Ltd conducted a large soil sampling program on the Noon property that partially covered the No. 3 zone.

In 2006, the property was restaked as the Copper claims by prospector Shawn Ryan and a soil sampling survey was performed with the samples being analysed by conventional ICP and MMI analyses.

In 2007 and 2008, BC Gold Corp performed soil sampling and MMI analyses on the area and in 2009 they performed line cutting and IP geophysical surveying.

 
 Capsule Geology
 
The Carmacks-Minto belt hosts of a series of mineralized zones that are metamorphosed copper deposits which occur along the boundary between the Yukon Tanana and Northern Stikine terranes. The mineralized zones/deposits include the Carmacks Copper deposit (Minfile occurrence 115I 008), the Stu (Minfile Occurrence #115I 011), Def (Minfile Occurrence #115I 021) and Minto (Minfile Occurrence #115I 022). A study by N. Kovacs, et. al. (2016) on the Carmacks Copper deposit provides new insight into the paragenesis of these occurrences. According to Kovacs, et. al., Carmacks Copper and the associated occurrences are hosted in compositionally heterogeneous, foliated and folded, and variably migmatitic metamorphic rocks, which occur as elongate, NNW-trending inliers in Early Jurassic granitoids of the Granite Mountain batholith. Hypogene copper mineralization is restricted to metamorphic host rocks, and occurs both as foliation-parallel chalcopyrite-dominant stringers in schistose rocks, and as net-textured bornite-chalcopyrite-dominant sulphides in the migmatitic rocks prevalent along the eastern margin of the metamorphic inlier. The latter style of mineralization is interpreted to form from a sulphide melt phase generated during partial melting of a previously mineralized protolith, during emplacement of the Granite Mountain batholith.

At the No. 3 zone outcrop is scarce (< 5%) and normally confined to rounded ridge tops and stream cuts. From what is known from the limited geological mapping and 4 drill holes, the occurrence is underlain primarily by foliated to non-foliated hornblende-biotite granodiorite with aplite dykes. Traces of malachite, magnetite and 1-2% epidote were noted in a number of locations.
 

Location Map

Last Updated: Dec 18, 2020

Work History

Year Work Type Comment
2009 Ground Geophysics: IP
2009 Other: Line Cutting
2008 Geochemistry: Soil
2007 Geochemistry: Soil
2006 Geochemistry: Soil
1981 Geochemistry: Soil
1971 Development, Surface: Access Road
1971 Drilling: Diamond 4 holes of unknown depth.
1971 Geochemistry: Soil
1971 Ground Geophysics: EM
1971 Ground Geophysics: Magnetics

Regional Geology - Terrane

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


Regional Geology - Bedrock

Supergroup:
Group/Suite: Minto
Formation:
Member:
Terrane:
Period Max: Triassic
Age Max: 204 MA
Period Min: Jurassic
Age Min: 195 MA
Rock Major: granodiorite/diorite
Rock Minor:
Reference: Tempelman-Kluit (1984) - GSC OF 1101
Geological Unit (1M): LTrEJM
Geological Unit (250K): LTrEJgM

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
095198 2008 2009 Geophysical Report on the COPPER Property IP - Ground Geophysics, Line Cutting - Other
094839 2006 Geochemical Report COPPER 1-22 Soil - Geochemistry
093083 1992 Biophysical Assessment Report of Williams Creek Silt - Geochemistry, Water - Geochemistry, Data Compilation - Pre-existing Data, Biophysical Mapping - Studies, Environmental Assessment/Impact - Studies, Heritage/Archeological - Studies
090929 1981 1981 Geological and Geochemical Report on the NOON Claim Group Electromagnetic - Airborne Geophysics, Magnetic - Airborne Geophysics, Soil - Geochemistry, Regional Bedrock Mapping - Geology, Petrographic - Lab Work/Physical Studies, Line Cutting - Other
060114 1972 Report on 1972 Geochemical Diamond Drilling and Trenching Program-WILLIAMS CREEK Property Interpretation - Airphotography, Diamond - Drilling, Drill Core - Geochemistry, Soil - Geochemistry, Detailed Bedrock Mapping - Geology, Line Cutting - Other, Mechanical - Trenching 8 1530.71

Related References

Number Title Page(s) Document Type
Citations
Kovacs, N., Allan, M.M., Crowley, J.L., Colpron, M., Hart, C.J.R., Zagorevski, A., and Creaser, R. A., 2020; Carmacks Copper Cu-Au-Ag Deposit: Mineralization and Postore Migmatization of a Stikine Arc Porphyry Copper System in Yukon, Canada. Economic Geology, v. 115, no. 7, pp. 1413–1442

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