Kejulik Occurrence, Bristol Bay District, Lake and Peninsula Borough, Alaska, USA
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Geology: This occurrence consists of highly bleached rocks at the base of a Pleistocene and late Tertiary volcanic neck. The neck consists of lava flows, breccias, tuffs, and domes of andesite and dacite (Riehle and others, 1993). The bleached rocks contain both disseminated and vein pyrite exposed in the valley floor. Panned concentrate samples collected by Church and Bennett (1989) contain pyrite, pyrite, sphalerite, and barite. The samples contain up to 300 parts per million (ppm) copper, 150 ppm zinc, 50 ppm cobalt, 50 ppm nickel, 10 ppm molybdenum, and 2.7 ppm cadmium (Church, Riehle, and Goldfarb, 1993).
Workings: Apparently only geochemical sampling by government geologists.
Age: Pleistocene and late Tertiary based on the age of the host rocks.
Alteration: Host rocks are bleached.
Commodities (Major) - Cu
Development Status: None
Deposit Model: Polymetallic vein; concealed porphyry copper? (Cox and Singer, 1986; model 22c,
Mineral List
4 entries listed. 4 valid minerals.
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References
Church, S.E., and Bennett, G.J., 1989, Geochemical map showing the distribution of selected minerals identified in nonmagnetic heavy-mineral concentrates from the Mount Katmai and parts of the Afognak and Naknek quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2021-D, 1 sheet, scale 1:250,000. Church, S.E., Detterman, R.L., and Wilson, F.H., 1989, Mineral and energy resource assessment maps of the Ugashik, Bristol Bay, and western Karluk quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF 1539-I, 2 map sheets, scale 1:250,000. Church, S.E., Frisken J.G., and Wilson, F.H., 1989, Interpretation of exploration geochemical data from Ugashik, Bristol Bay, and western Karluk quadrangles, Alaska: U.S Geological Survey Bulletin 1858, 45 p. Church, S.E., Riehle, J.R., and Goldfarb, R.J., 1993, Interpretation of exploration geochemical data for the Mount Katmai quadrangle, and adjacent parts of the Afognak and Naknek quadrangles, Alaska: U.S. Geological Survey Bulletin 2020, 67 p., 3 plates, scale 1:250,000. Church, S.E., Riehle, J.R, Magoon, L.B., and Campbell, D.L., 1992, Mineral and energy resource assessment maps of the Mount Katmai, Naknek, and western Afognak quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF 2021-F, 22 p., 2 sheets, scale 1:250,000. Riehle, J.R., Detterman, R.L., Yount, M.E., and Miller, J.W., 1993, Geologic map of the Mount Katmai quadrangle and adjacent parts of the Naknek and Afognak quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-2204, 1 sheet, scale 1:250,000.