Unnamed Prospect (ARDF - SR251; south end of Herring Bay), Prince William Sound District, Valdez-Cordova Borough, Alaska, USA
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Geology: The prospect consists of several short adits and a prospect pit that explored thin, discontinuous sulfide veins, stringers, and lenses hosted in sheared greenstone of the Orca Group of early Teriary age. Sulfide minerals are chalcopyrite, pyrite, pyrrhotite, and sphalerite (Cobb and Tysdal, 1980). A 50-foot adit was driven into fractured greenstone healed with quartz, pyrite, sphalerite, and chalcopyrite (Grant and Higgins, 1909). The prospect pit exposed irregular mineralization consisting of chalcopyrite, sphalerite, and pyrite. Epidote stringers occur in the country rock, but there is no well-defined vein or shear zone associated with these stringers.
Workings: Four workings are described in the literature. Grant and Higgins (1909) described a 25-foot adit that is a quarter of a mile south of the camp and a 50-foot adit. Johnson (1918 [B 662-C, p. 212]) described a 30-foot adit with a 10-foot drift to the north driven at an elevation of 110 feet. He also mentioned a 15-foot-wide open cut, west of the 30-foot adit. When the U.S. Bureau of Mines searched for this prospect in the early 1980's, they found none of these workings, and they did not collect samples from the area. Improvements on the property were two bunk and mess houses on the beach and a floating dock (Grant and Higgins, 1909). No other information is available.
Age: Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.
Alteration: Greenstone is altered to epidote.
Commodities (Major) - Cu; (Minor) - Zn
Development Status: None
Deposit Model: Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral List
6 entries listed. 6 valid minerals.
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References
Cobb, E.H., and Richter, D.H., 1972, Metallic mineral resources map of the Seward quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-466, 2 sheets, scale 1:250,000. Cobb, E.H., and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p. Condon, W.H., and Cass, J.T., 1958, Map of a part of the Prince William Sound area, Alaska, showing linear geologic features as shown on aerial photographs: U.S. Geological Survey Miscellaneous Investigations Series Map I-273, 1 sheet, scale 1:125,000. 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. Johnson, B.L., 1918, Copper deposits of the Latouche and Knight Island districts, Prince William Sound: U.S. Geological Survey BuIletin 662-C, p. 193-220. 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. MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000. 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. 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.