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Shelton Prospect, Twelvemile Arm, Kasaan Bay, Prince of Wales Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
Latitude: 55°25'59"N
Longitude: 132°38'27"W
Longitude: 132°38'27"W
Geology: A quartz-calcite vein about 6 feet thick cuts fractured marble associated with schist and phyllite that are part of the Descon Formation of Silurian and Ordovician age (Wright and Wright, 1908; Twenhofel and others, 1949; Eberlein and others, 1983; Brew, 1996). The vein strikes N20E and dips 65 SE, and contains 1 to 2 percent pyrite and chalcopyrite. A 6-foot sample across the vein contained 0.25 percent copper. The prospect was explored by a short drift and a 55-foot winze. Maas and others (1991) were not able to find the workings but did find mining debris near the reported site of the prospect. Their samples of quartz in rubble contained 11.8 to 12.3 parts per million silver and 1.8 to 1.92 percent copper.
Workings: The prospect was explored by a short drift and a 55-foot winze prior to 1908.
Age: Unknown, other than that the vein cuts Silurian or Ordovician marble.
Commodities (Major) - Ag, Cu
Deposit Model: Quartz-calcite vein with pyrite and chalcopyrite.
Mineral List
| Calcite | Chalcopyrite | Pyrite | Quartz |
4 entries listed. 4 valid minerals.
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References
Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000. Brooks, A.H., 1902, Preliminary report on the Ketchikan mining district, Alaska, with an introductory sketch of the geology of southeastern Alaska: U.S. Geological Survey Professional Paper 1, 120 p. Cobb, E. H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-869, 262 p. Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A. T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, 52 p. Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p. Maas, K.M., Still, J. C., and Bittenbender, P. E., 1992, Mineral investigations in the Ketchikan mining district, Alaska, 1991 - Prince of Wales Island and vicinity: U.S. Bureau of Mines Open-File Report 81-92, 69 p. Maas, K.M., Still, J. C., Clough, A. H., and Oliver, L. K., 1991, Mineral investigations in the Ketchikan mining district, Alaska, 1990: Southern Prince of Wales Island and vicinity--Preliminary sample location maps and descriptions: U.S. Bureau of Mines Open-File Report 33-91, 139 p. Twenhofel, W.S., Reed, J. C., and Gates, G.O., 1949, Some mineral investigations in southeastern Alaska: U.S. Geological Survey Bulletin 963-A, p. 1-45. Wright, F.E., and Wright, C.W., 1906, Lode mining in southeastern Alaska: U.S. Geological Survey Bulletin 284, p. 30-54. Wright, F.E., and Wright, C.W., 1908, The Ketchikan and Wrangell mining districts, Alaska: U.S. Geological Survey Bulletin 347, 210 p.
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