Unnamed Occurrence (ARDF - SI150; south of Sealion Cove), Chichagof District, Sitka Borough, Alaska, USA
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Geology: Loney and others (1975) map the rocks in the area of this occurrence as Jurassic and Cretaceous graywacke that is intruded by a stock of Tertiary (Eocene) granodiorite. The graywacke is widely metamorphosed by the intrusion to hornfels and schist. Cobb (1972, 1978), citing Loney and others (1963), describes the occurrence as molybdenite and chalcopyrite in quartz veins in biotite hornfels associated with pegmatite dikes. Bittenbender and others (1999) describe the occurrence as a porphyry molybdenum-copper deposit; samples contained up to 2,450 parts per billion gold, 21 parts per million (ppm) molybdenum, 110 ppm copper, and more than 1 percent arsenic.
Workings: Only surface sampling.
Commodities (Major) - Au, Cu, Mo; (Minor) - As
Development Status: None
Deposit Model: Polymetallic veins and/or porphyry Mo-Cu deposit (Cox and Singer, 1986; models
3 entries listed. 3 valid minerals.
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Bittenbender, P., Still, J.C., Maas, K., and McDonald, M., Jr., 1999, Mineral resources of the Chichagof and Baranof Islands area, southeast Alaska: Bureau of Land Management, BLM-Alaska Technical Report 19, 222 p. Cobb, E.H., 1972, Metallic mineral resources map of the Sitka quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-467, scale 1:250,000. Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Sitka quadrangle: U.S. Geological Survey Open-File Report 78-450, 124 p. Loney, R.A., Berg, H.C., Pomeroy, J.S., and Brew, D.A., 1963, Reconnaissance geologic map of Chichagof Island and northwestern Baranof Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-388, 1 sheet, scale 1:250,000. U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]