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Unnamed (east of Marsha Bay)

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-2
Latitude 60.3455
Longitude -147.6746
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located near tidewater on the east shore of Marsha Bay. It is in the SW1/4 section 14, T. 3 N., R. 10 E., of the Seward Meridian. This is location 214 of Tysdal (1978 [MF-880-A]) and location S-66 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The prospect consists of a 3-foot-wide mineralized dike that crosscuts sheared greenstone and chert of the Orca Group (Richter, 1965). The age of the dike is unknown. The dike contains disseminated pyrrhotite, pyrite, and chalcopyrite. Three samples of sheared greenstone and two of a basalt dike contained from 65 to 150 ppm copper and from 63 to 130 ppm zinc (Kurtak and Jeske, 1986).
Geologic map unit (-147.676591957856, 60.3448926441907)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration Richter (1965) reported a small prospect pit, but it was not located by the U.S. Bureau of Mines when they investigated the prospect in the early 1980s. Three samples of sheared greenstone and two of a basalt dike contained from 65 to 150 ppm copper and from 63 to 130 ppm zinc (Kurtak and Jeske, 1986).
Indication of production None

References

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, scale 1:63,360.
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.
Richter, D.H., 1965, Geology and mineral deposits of central Knight Island, Prince William Sound, Alaska: Alaska Division of Mines and Minerals Geologic Report 16, 40 p., 1 sheet, scale 1:40,000.
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.
Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 12/6/2001