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Unnamed (near Cathead Bay, Knight Island)

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu; Zn
Other commodities Fe
Ore minerals chalcopyrite; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-3
Latitude 60.2834
Longitude -147.8554
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the NE1/4 section 10, T. 2 N., R. 9 E., of the Seward Meridian. It is 15 feet above the high tide line on the southwest shore of Cathead Bay, Knight Island. This is location 233 of Cobb and Tysdal (1980) and location S-46 of Jansons and others (1984). This location is accurate to within 500 feet.

Geologic setting

Geologic description

The prospect consists of disseminated pyrite and quartz-pyrite veins in greenstone of the Orca Group of early Tertiary age (Nelson and others, 1985). Workings on the prospect consist of a 41-foot-long adit that strikes S 50 E. The adit follows a limonite-stained fracture zone that contains numerous quartz-pyrite veinlets, some as much as half an inch thick. Sulfide minerals in this zone include chalcopyrite and pyrite. Four samples collected from the adit and other nearby exposures contained between 100 ppm and 0.16 percent zinc and 14 to 520 ppm copper (Kurtak and Jeske, 1986).
Geologic map unit (-147.857477099047, 60.2828474655641)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Tertiary or younger; the occurrence is in rocks of the Orca Group of Tertiary age.
Alteration of deposit Basalt is altered to greenstone.

Production and reserves

Workings or exploration The workings on the prospect consist of a 41-foot-long adit driven along a limonite-stained fracture zone. Four samples collected from the adit and other nearby exposures contained between 100 ppm and 0.16 percent zinc and from 20 to 540 ppm copper (Kurtak and Jeske, 1986).
Indication of production None

References

MRDS Number A010360

References

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.
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.
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.
Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 12/15/2000