Unnamed Occurrence (ARDF - SI131; southwest of Ushk Bay), Chichagof District, Sitka Borough, Alaska, USA
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Geology: Johnson and Karl (1985) map the rocks in the area of this occurrence as Mesozoic or Paleozoic, amphibolite, gneiss, schist, and marble, and as undivided siliceous metasedimentary and metavolcanic rocks. The rocks are cut by high-angle, mainly northwest-striking faults. Bittenbender and others (1999), mainly citing Kimball (1982), describe the occurrence as a disseminated sulfide deposit in Triassic(?) greenstone and amphibolite. Samples contained up to 220 parts per million (ppm) copper, 0.7 ppm silver, and 100 ppm molybdenum.
Workings: Only limited surface sampling.
Commodities (Major) - Ag, Cu, Mo
Development Status: None
Deposit Model: Disseminated sulfide deposit.
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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. Johnson, B.R, and Karl, S.M., 1985, Geologic map of western Chichagof and Yakobi Islands, southeastern Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map 1-1506, 1 sheet, scale 1:125,000. Kimball, A.L., 1982, Mineral land assessment of Yakobi Island and adjacent parts of Chichagof Island, southeastern Alaska: U. S. Bureau of Mines Mineral Land Assessment report, MLA 97-82, 199 p. 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]