General Information
Deposit Type(s): Ultramafic Mafic Gabbroid Cu-Ni-PGE
Location(s): 61.323610 N, -139.115560 W
NTS Mapsheet(s): 115G06
Location Comments: 1 Kilometres
Hand Samples Available at YGS: No
Capsule
Work History
Staked as Duke cl (Y18586) in Jun/67 by Newmont. The east end of the block was restaked as Mill cl (Y51882) in Apr/70 by J. Williams and F. Hasselberg. Newmont's staking was based on GSC aeromagnetic data and was followed by prospecting and silt sampling later in the year.
Capsule Geology
The occurrence is located in Wrangellia, an accreted terrane extending 2340 km from Alaska to southern B.C.. In the area of the occurrence, Wrangellia is bounded to the northeast by the Denali Fault System and to the southwest by the Duke River Fault. The oldest Wrangellian rocks in the region are the Pennsylvanian to Permian Skolai Group, which consists of Station Creek Formation tuffs, pyritic black tuffs, mafic volcanics and argillite that are overlain by Hasen Creek Formation tuffs, mafic volcanics, argillite and limestone. The Skolai Group is stratigraphically overlain by Middle(?) Triassic phyllite, Upper Triassic Nikolai formation basalt and Upper Triassic McCarthy Formation Limestone and phyllite. Tertiary volcanic and sedimentary rocks unconformably overlie the sequence.
Two major suites of intrusive rocks are present in the belt. The oldest is Triassic and includes gabbro, peridotite, dunite and clinopyroxenite of the Kluane mafic-ultramafic complex and gabbro sills and dykes of the Maple Creek Gabbro. The sills are estimated to be up to 18 km long and 600 m thick. The Maple Creek gabbro is though to be coeval with the Kluane mafic-ultramafic complex and to have acted as a feeder to the Nikolai formation. The Cretaceous Kluane Ranges suite are dioritic to granodioritic in composition and occur throughout northern Wrangellia. Minor Tertiary sills, dykes and stocks of felsic to intermediate composition are also present.
The claims are largely overburden-covered but are mapped as (Israel et al., 2005) being underlain by Upper Triassic Nikolai formation volcanic rocks. No significant mineralization was found although minor copper occurrences are common in the Triassic rocks.
References
ISRAEL, S. and VAN ZEYL, D., 2004. Preliminary bedrock geology of the Quill Creek area (parts of NTS 115G/5, 6, 12), southwest Yukon (1:50 000 scale). Yukon Geological Survey, Open File 2004-2.
ISRAEL, S., TIZZARD, A. and MAJOR, J., 2005. Geological map of the Duke River area (parts of NTS 115G/2, 3, 5, 6, 7), Yukon (1:50,000 scale). Yukon Geological Survey, Open File 2005-11.
READ, P.B. and MONGER, J.W.H., 1976. Pre-Cenozoic assemblages of the Kluane and Alsek Ranges, southwest Yukon Territory. Geological Survey of Canada, Open File 381, 96 p.
Staked as Duke cl (Y18586) in Jun/67 by Newmont. The east end of the block was restaked as Mill cl (Y51882) in Apr/70 by J. Williams and F. Hasselberg. Newmont's staking was based on GSC aeromagnetic data and was followed by prospecting and silt sampling later in the year.
Capsule Geology
The occurrence is located in Wrangellia, an accreted terrane extending 2340 km from Alaska to southern B.C.. In the area of the occurrence, Wrangellia is bounded to the northeast by the Denali Fault System and to the southwest by the Duke River Fault. The oldest Wrangellian rocks in the region are the Pennsylvanian to Permian Skolai Group, which consists of Station Creek Formation tuffs, pyritic black tuffs, mafic volcanics and argillite that are overlain by Hasen Creek Formation tuffs, mafic volcanics, argillite and limestone. The Skolai Group is stratigraphically overlain by Middle(?) Triassic phyllite, Upper Triassic Nikolai formation basalt and Upper Triassic McCarthy Formation Limestone and phyllite. Tertiary volcanic and sedimentary rocks unconformably overlie the sequence.
Two major suites of intrusive rocks are present in the belt. The oldest is Triassic and includes gabbro, peridotite, dunite and clinopyroxenite of the Kluane mafic-ultramafic complex and gabbro sills and dykes of the Maple Creek Gabbro. The sills are estimated to be up to 18 km long and 600 m thick. The Maple Creek gabbro is though to be coeval with the Kluane mafic-ultramafic complex and to have acted as a feeder to the Nikolai formation. The Cretaceous Kluane Ranges suite are dioritic to granodioritic in composition and occur throughout northern Wrangellia. Minor Tertiary sills, dykes and stocks of felsic to intermediate composition are also present.
The claims are largely overburden-covered but are mapped as (Israel et al., 2005) being underlain by Upper Triassic Nikolai formation volcanic rocks. No significant mineralization was found although minor copper occurrences are common in the Triassic rocks.
References
ISRAEL, S. and VAN ZEYL, D., 2004. Preliminary bedrock geology of the Quill Creek area (parts of NTS 115G/5, 6, 12), southwest Yukon (1:50 000 scale). Yukon Geological Survey, Open File 2004-2.
ISRAEL, S., TIZZARD, A. and MAJOR, J., 2005. Geological map of the Duke River area (parts of NTS 115G/2, 3, 5, 6, 7), Yukon (1:50,000 scale). Yukon Geological Survey, Open File 2005-11.
READ, P.B. and MONGER, J.W.H., 1976. Pre-Cenozoic assemblages of the Kluane and Alsek Ranges, southwest Yukon Territory. Geological Survey of Canada, Open File 381, 96 p.
Location Map
Last Updated: Sep 15, 2011
Work History
| Year | Work Type | Comment |
|---|---|---|
| 1967 | Geochemistry: Silt | |
| 1967 | Other |
Regional Geology - Terrane
Group: Insular
Affinity: NE Panthalassa
Name: Wrangellia
Realm: Panthalassa
Regional Geology - Bedrock
Supergroup:
Group/Suite:
Formation: Nikolai
Member: volcanic
Terrane: Wrangellia
Period Max: Triassic
Age Max: 229 MA
Period Min: Triassic
Age Min: 204 MA
Rock Major: basalt
Rock Minor: volcanic breccia
Reference: Israel et al. (2005) - YGS OF 2005-11
Geological Unit (1M): uTrN
Geological Unit (250K): uTrN2
Assessment Reports that overlap occurrence
| Report Number | Year | Title | Worktypes | Holes Drilled | Meters Drilled |
|---|---|---|---|---|---|
| 060989 | 1970 | Report on Niamodlaoc Mountain Coal Prospect, 1970 Field Season | Rock - Geochemistry | ||
| 092054 | 1953 | Report on the Geophysical Surveys in the Shakwak Valley Area, Yukon Territory for Canalask Nickel Mines Limited. | Magnetic - Airborne Geophysics |
