Unnamed Occurrence (ARDF - CR044), Salmon Lake, Karta River Wilderness, Prince of Wales Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
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Location: This occurrence is at the mouth of Salmon Lake. It is near the northeast corner of section 4, T. 73 S., R. 84 E. The location is accurate.
Geology: This occurrence is at or near the contact of a large granodiorite-quartz diorite stock (Sainsbury, 1961; Eberlein and others, 1983; Brew, 1996). Early workers considered the stock to be Mesozoic or Cretaceous, but recent radiometric dating indicates that it is Devonian (S.M. Karl, oral communication, 2003). The pluton is in contact with hornfelsed chert, argillite, graywacke, and tuff of the Silurian and Ordovician Descon Formation. The rocks near the contact contain disseminated sulfides and quartz-sulfide veins with a few grains of scheelite (Sainsbury, 1961). The sulfides are mainly pyrite and pyrrhotite with minor chalcopyrite and galena.
Workings: Only surface sampling by a government geologist.
Age: The mineralization is in the contact zone of a Devonian granitic pluton and is probably related to its emplacement.
Alteration: The mineralized sedimentary rocks near the contact are hornfelsed.
Commodities (Major) - Cu, Pb, W
Development Status: None
Deposit Model: Contact metamorphic Cu-Pb-W deposit.
6 entries listed. 6 valid minerals.
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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. 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. Sainsbury, C.L., 1961, Geology of part of the Craig C-2 quadrangle and adjoining area, Prince of Wales Island, southeastern Alaska: U.S. Geological Survey Bulletin 1058-H, p. H299-H362.