MacKevett and Plafker (1970, sample number 67APr-34A) reported 0.08 ppm gold, 200 ppm cobalt, and 300 ppm copper in a grab sample of a quartz vein, chosen as representative of numerous quartz veins found at and near this location. Data on the occurrence are given in Cobb (1979).
Location: The locality is a lode occurrence on The Nunatak south of Nunatak Fiord about 8 miles east of the mouth of the fiord. The occurrence is number 1 of Cobb (1972). The approximate location of the site was estimated from pl. 1 of MacKevett and Plafker (1970).
Geology: Sulfide-bearing quartz veins a few inches wide occur in weakly metamorphosed schist-phyllite of original sedimentary and volcanic origin. The rocks belong to the Yakutat group. A representative sample of quartz vein material collected by MacKevett and Plafker (1970) contained anomalous amounts of gold, cobalt, and copper.
Workings: Outcrop sample.
Age: Tertiary?
Commodities (Major) - Au; (Minor) - Co, Cu
Development Status: Undetermined.
Deposit Model: Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
References:
Cobb, E.H., 1972, Metallic mineral resources map of the Yakutat quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-408, 1 sheet, scale 1:250,000. Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bering Glacier, Icy Bay, Middleton Island, and Yakutat quadrangles, Alaska: U.S. Geological Survey Open-File Report 79-1246, 41 p. MacKevett, E.M., Jr., and Plafker, G., 1970, Geochemical and geophysical reconnaissance of parts of the Yakutat and Mount St. Elias quadrangles, Alaska: U.S. Geological Survey Bulletin 1312-L, p. L1-L12 p.
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Map Reference: 59°49'47"N , 139°3'0"W
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Mineral List:2 entries listed. 2 valid minerals.
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