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Unnamed (Knight Island, north shore of Mummy Bay)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Cr; Zn
Ore minerals malachite

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale A-3
Latitude 60.2228
Longitude -147.8306
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located on the northwest shore of Mummy Bay, 1.2 miles north-northwest of Oceanic seaplane base. It is in the NE1/4 section 35, T. 2 N., R. 9 E., of the Seward Meridian. This is location 248 of Tysdal (1978 [MF-880-A]) and location S-32 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The occurrence is hosted in sheared greenstone of the Orca Group of early Tertiary age (Nelson and others, 1985). Tysdal (1978 [MF-880-A]) reported iron- and malachite-stained sheared greenstone that contained 500 ppm copper, 300 ppm chrome, and 100 ppm zinc. No other information is published.
Geologic map unit (-147.832661637671, 60.2222315848999)
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 altered to greenstone.

Production and reserves

Workings or exploration Tysdal (1978 [MF-880-A]) reported iron- and malachite-stained sheared greenstone that contained 500 ppm copper, 300 ppm chrome, and 100 ppm zinc. No other information is published.
Indication of production None

References

MRDS Number A010563

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.
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 3/9/2001