General Information
Secondary Commodities: tin, silver, zinc
Deposit Type(s): Vein and Greisens Sn
Location(s): 60.209690 N, -131.632650 W
NTS Mapsheet(s): 105B04
Location Comments: Based on the drill collar of DDH K81-1 in AR 090971
Hand Samples Available at YGS: No
Capsule
Work History
Staked as part of a large block of DU claims (1-239) in 1978 by the Klinkit Joint Venture (DuPont of Canada Exploration Limited & Duval International Corporation), which explored with geological mapping and geochemical sampling in 1978. In 1979, further mapping and a grid soil survey 1 km to the west of the occurrence were carried out. A single drillhole was drilled at the occurrence in 1981 (DDH81-1), and rock sampling was undertaken to the southeast. The DuPont interest was transferred to CSA Minerals Inc in 1984 and to Goldsearch Inc in 1985. In 1993, prospecting occurred south of the occurrence. In 2014, Ucore flew a large airborne radiometric and magnetic survey over the region, covering almost the entire mapped extent of the Seagull Batholith. In 2018, the JC claims were staked to cover the occurrence and an airborne radiometric and magnetic survey was flown over the property.
Capsule Geology
This occurrence lies within a belt of Yukon-Tanana Terrane rocks. This belt of rocks is part of an accreted island arc assemblage consisting of biomodal volcanics, coeval plutons and sedimentary rocks, as well as younger Jurassic intrusive rocks and overlap assemblages and Cretaceous intrusions. The occurrence is hosted in mid-Cretaceous Seagull Batholith quartz monzonite.
Cassiterite occurs in a quartz fracture stockwork cutting a flat aplite dyke near the ceiling of the mid-Cretaceous Seagull batholith and in a small hornfelsed roof pendant of Triassic Jones Lake Formation calcareous metasedimentary rocks to the east.
The 1981 drillhole (10° azimuth; 121.4 m) tested a large zone of greisen alteration from which specimens assayed up to 0.5% Sn. Drilling intersected several narrow east-striking, steeply south-dipping vein zones of quartz, sphalerite, +/-galena, +/- pyrite The best intersections were two 1 m intervals assaying 0.4 and 0.2% Sn.
In 1981, rock sampling, uphill and ~300 m southeast of the occurrence at the Dupont Plateau Zone, returned values of 0.01% Sn, 188 g/t Ag and anomalous zinc and lead (sample 67661b; AR 090778).
Prospecting south of the occurrence in 1993, as part of a YMIP-funded (Yukon Mining Incentive Program) program uncovered rock samples with anomalous metal values. Grab sample 223030, 350 m south of the occurrence, assayed 142 ppb Au, 0.7 g/t Ag, 1.8% Pb, 0.55% Zn and 0.2% Bi.
Staked as part of a large block of DU claims (1-239) in 1978 by the Klinkit Joint Venture (DuPont of Canada Exploration Limited & Duval International Corporation), which explored with geological mapping and geochemical sampling in 1978. In 1979, further mapping and a grid soil survey 1 km to the west of the occurrence were carried out. A single drillhole was drilled at the occurrence in 1981 (DDH81-1), and rock sampling was undertaken to the southeast. The DuPont interest was transferred to CSA Minerals Inc in 1984 and to Goldsearch Inc in 1985. In 1993, prospecting occurred south of the occurrence. In 2014, Ucore flew a large airborne radiometric and magnetic survey over the region, covering almost the entire mapped extent of the Seagull Batholith. In 2018, the JC claims were staked to cover the occurrence and an airborne radiometric and magnetic survey was flown over the property.
Capsule Geology
This occurrence lies within a belt of Yukon-Tanana Terrane rocks. This belt of rocks is part of an accreted island arc assemblage consisting of biomodal volcanics, coeval plutons and sedimentary rocks, as well as younger Jurassic intrusive rocks and overlap assemblages and Cretaceous intrusions. The occurrence is hosted in mid-Cretaceous Seagull Batholith quartz monzonite.
Cassiterite occurs in a quartz fracture stockwork cutting a flat aplite dyke near the ceiling of the mid-Cretaceous Seagull batholith and in a small hornfelsed roof pendant of Triassic Jones Lake Formation calcareous metasedimentary rocks to the east.
The 1981 drillhole (10° azimuth; 121.4 m) tested a large zone of greisen alteration from which specimens assayed up to 0.5% Sn. Drilling intersected several narrow east-striking, steeply south-dipping vein zones of quartz, sphalerite, +/-galena, +/- pyrite The best intersections were two 1 m intervals assaying 0.4 and 0.2% Sn.
In 1981, rock sampling, uphill and ~300 m southeast of the occurrence at the Dupont Plateau Zone, returned values of 0.01% Sn, 188 g/t Ag and anomalous zinc and lead (sample 67661b; AR 090778).
Prospecting south of the occurrence in 1993, as part of a YMIP-funded (Yukon Mining Incentive Program) program uncovered rock samples with anomalous metal values. Grab sample 223030, 350 m south of the occurrence, assayed 142 ppb Au, 0.7 g/t Ag, 1.8% Pb, 0.55% Zn and 0.2% Bi.
Location Map
Last Updated: Jun 2, 2020
Work History
| Year | Work Type | Comment |
|---|---|---|
| 2018 | Airborne Geophysics: Magnetic | |
| 2018 | Airborne Geophysics: Radiometric | |
| 1981 | Drilling: Diamond | 1 hole, 121.4 m |
| 1981 | Geochemistry: Rock | sampling southeast of occurrence |
| 1979 | Geochemistry: Soil | Contour soils, south of the occurrence |
| 1979 | Geology: Bedrock Mapping | |
| 1978 | Geology: Bedrock Mapping |
Regional Geology - Terrane
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Regional Geology - Bedrock
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Age Max: MA
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Age Min: MA
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Related References
| Number | Title | Page(s) | Document Type |
|---|---|---|---|
| 2004-2 | Bedrock Geology, Dorsey Lake (NTS 105B/4), southern Yukon (1:50,000 scale) | Open File (Geological - Bedrock) |
| Citations |
|---|
| ROOTS, C.F., DE KEIJZER, M. AND NELSON, J.L., 2000. Wolf Lake project: Revision mapping of Dorsey Terrane assemblages in the upper Swift River area, southern Yukon and northern B.C. In: Yukon Exploration and Geology 1999, D.S. Emond and L.H. Weston (eds.), Exploration and Geological Services Division, Yukon, Indian and Northern Affairs Canada, p. 115-125. |
Drill Core at YGS Core Library
| Number | Property | Year Drilled | Core Size | Photos | Data |
|---|---|---|---|---|---|
| K81-1 | Swift | 1981 | NQ | 16 | 3 |
