Glendenning Prospect, Prince William Sound District, Valdez-Cordova Borough, Alaska, USA
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Geology: The prospect is a 6- to 70-foot- wide shear zone in silicified graywacke and Eocene muscovite-bearing granite. The zone contains quartz veins carrying chalcopyrite, covellite, pyrite, and sphalerite (Jansons and others, 1984). The largest vein is 20 centimeters thick and 1 to 1.5 meters long. It contains mostly pyrite along with traces of chalcopyrite and covellite (Tysdal, 1978 [MF-880-A]). The single working on the prospect is a 700-foot adit. Three grab samples collected by the U.S. Bureau of Mines contained from 30 to 825 ppm copper (Jansons and others, 1984).
Workings: The single working on the prospect is a 700-foot-long adit. Three grab samples collected by the U.S. Bureau of Mines contained from 30 to 825 ppm copper (Jansons and others, 1984).
Age: Eocene or younger; the shear zone cuts Eocene granite.
Alteration: Silicification.
Commodities (Major) - Cu; (Minor) - Zn
Development Status: None
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model 22c)
Mineral List
4 entries listed. 4 valid minerals.
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References
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. Moffit, F.H., and Fellows, R.E., 1950, Coper deposits of the Prince William Sound district, Alaska: U.S. Geological Survey Bulletin 963-B, p. 47-80. Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.