Stevens Prospect, Kasaan Peninsula, Prince of Wales Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
Location: This prospect is about one mile southeast of the Salt Chuck Mine (CR049). It is near the center of the north boundary of section 21, T. 72 S., R. 84 E. (Early in the history of the Salt Chuck Mine, a claim on that property was called Stevens for the prospector who staked it, but that name has long since fallen out of use at the mine. The same prospector also found the deposit at this site.)
Geology: This prospect consists of a small pit and trench that exposes diorite with small stringers and masses of bornite along fractures Some of the fractures also contain aplitic material (Gault, 1945; Sainsbury, 1961; Gault and Wahrhaftig, 1992). The rocks are an extension of the gabbro-pyroxenite-diorite pluton that hosts the Salt Chuck deposit (CR049) about a mile to the northwest; the presence of bornite at this prospect suggests that the deposits are similar. The pluton at the Salt Chuck Mine has been dated at 429 Ma (Loney and others, 1987). See CR049 for a fuller description of this type of deposit at a much better studied locality.
Workings: Only a small pit and trench.
Age: The mineralization is probably related to the emplacement of a 429 Ma gabbro-pyroxenite-diorite pluton.
Alteration: Not noted at this prospect but it is well documented at the geologically similar Salt Chuck deposit (CR049) about a mile to the northwest.
Commodities (Major) - Cu
Development Status: None
Deposit Model: Masses and disseminations of bornite in diorite.
1 entry listed. 1 valid mineral.
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Gault, H.R., 1945, The Salt Chuck copper-palladium mine, Prince of Wales Island, southeastern Alaska: U.S. Geological Survey War Minerals Report for Federal War Agencies, 19 p. Gault, H.R., and Wahrhaftig, Clyde, 1992, The Salt Chuck copper-palladium mine, Prince of Wales Island, southeastern Alaska: U.S. Geological Survey Open-File Report 92-293, 5 maps, 24 p. Loney, R.A., Himmelberg, G.R., and Shew, Nora, 1987, Salt Chuck palladium-bearing ultramafic body, Prince of Wales Island: U.S. Geological Survey Circular 998, p. 126-127. 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.
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Locality Updated: Wheal Liberty, Mithian, St Agnes, St Agnes District, Cornwall, England, UKFrom Peter Haas, 31st Aug 2014 01:33:53