Unnamed Occurrence (ARDF - SR233; Knight Island; northwest of the head of Snug Harbor), Prince William Sound District, Valdez-Cordova Borough, Alaska, USA
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Geology: Nelson and others (1985) mapped bedrock in this area as Orca Group of early Teriary age. The occurrence consists of a north-south-trending 30-foot-wide shear zone that cuts greenstone. The shear zone contains as much as 5 percent pyrrhotite and traces of chalcopyrite. A chip sample across the zone contained 14 ppm copper and 50 ppm zinc (Kurtak and Jeske, 1986).
Workings: A single chip sample taken across a 30-foot-wide shear zone contained 14 ppm copper and 50 ppm zinc (Kurtak and Jeske, 1986).
Age: Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.
Commodities (Major) - Cu; (Minor) - Zn
Development Status: None
Deposit Model: Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral List
2 entries listed. 2 valid minerals.
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References
Grant, U.S., and Higgins, D.F., Jr., 1909, Notes on geology and mineral prospects in the vicinity of Seward, Kenai Peninsula: U.S. Geological Survey Bulletin 379-C, p. 98-107. Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000. Kurtak, J.M., and Jeske, R.E., 1986, Mineral investigations in the Chugach National Forest, Alaska (Islands area): U.S. Bureau of Mines Open-File Report 54-86, 302 p., 1 sheet. Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.