Unnamed Occurrence (ARDF - SR312; Latouche island near Reynolds Peak), Prince William Sound District, Valdez-Cordova Borough, Alaska, USA
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Geology: The occurrence consists of a limonite-stained gossan that contains pyrite and chalcopyrite. The gossan zone is 4 feet wide and more than 45 feet long (Tysdal, 1978 [MF-880-A]). Tysdal (1978 [MF-880-A]) reported a semiquantitive spectrographic analysis of the gossan is 700 ppm copper, and 500 ppm zinc. The host rock is altered slate and sandstone of the Orca Group of early Teriary age (Nelson and others, 1985).
Workings: No workings are reported.
Age: Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.
Alteration: The host rock is altered, but the type of alternation is not reported (Tysdal, 1978 [MF-880-A]).
Commodities (Major) - Cu, Zn
Development Status: None
Deposit Model: Besshi massive sulfide (Cox and Singer, 1986; model 24b)
Mineral List
2 entries listed. 2 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. 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. 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.