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Silver Star

Prospect, Inactive

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Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Ore minerals argentiferous tetrahedrite; azurite; galena; malachite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-8
Latitude 61.7345
Longitude -143.9096
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is near the summit of the ridge north of the Kotsina River. It is at an elevation about 5,300 feet, about 700 feet south-southeast of elevation 5629 (Vesna) and 1,000 feet south-southwest of the center of section 35, T. 1 S., R. 8 E. of the Copper River Meridian. This is locality 176 of MacKevett (1976) and locality 2 of MacKevett and others (1978). The location is accurate to within about 100 feet. Cobb and MacKevett (1980) included this prospect under the name 'Silver Star'.

Geologic setting

Geologic description

The deposit at this prospect consists of quartz veins to 30 inches wide that are localized along faults and hanging wall fractures in Triassic Nikolai Greenstone (Moffit and Mertie, 1923; MacKevett, 1976). The veins contain argentiferous tetrahedrite, galena, sphalerite, malachite, and azurite. Samples of selected material were reported to assay 25 to 700 ounces of silver per ton and 1 to 32 percent copper (Mertie and Moffit, 1923). The deposits were explored by two adits up to 260 feet long.
Geologic map unit (-143.911694529285, 61.7340388739078)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Age of mineralization Triassic or younger based on the age of the host rock.
Alteration of deposit Oxidation of copper minerals; iron-staining.

Production and reserves

Workings or exploration The deposits were explored by two adits up to 260 feet long.
Indication of production Undetermined

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References

MRDS Number A011760

References

Cobb, E.H., and MacKevett, E.M., Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the McCarthy quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-885, 156 p.
MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, 2 sheets, scale 1:250,000.
MacKevett, E.M., Jr., Smith, J.G., Jones, D.L., and Winkler, G.R., 1978, Geologic map of the McCarthy C-8 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1418, 1 sheet, scale 1:63,360.
Moffit, F.H., and Mertie, J.B., Jr., 1923, The Kotsina-Kuskulana district, Alaska: U.S. Geological Survey Bulletin 745, 149 p.
Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003