Main commodities | Cu |
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Ore minerals | chalcocite; cuprite; malachite; native copper |
Gangue minerals | calcite; zeolite |
Quadrangle map, 1:250,000-scale | MC |
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Quadrangle map, 1:63,360-scale | C-2 |
Latitude | 61.6742 |
Longitude | -141.6651 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This prospect is at the head of Sheep Creek, a south tributary to the White River. It is at an elevation of about 5,900 feet, 4,000 feet northeast of elevation 6696, in the SE1/4 of section 19, T. 2 A., R. 21 E. of the Copper River Meridian. This is locality 148 of MacKevett (1976); the location is is accurate to within about 1,000 feet. |
Geologic descriptionThis deposit consists of native copper, chalcocite, cuprite, malachite, calcite, and zeolite(?) that fill amygdules in Triassic Nikolai Greenstone (Capps, 1916; MacKevett, 1976). The deposits were explored by an adit that was caved by 1916. Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997). | |
Geologic map unit | (-141.66719143189, 61.6738280119023) |
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Mineral deposit model | Basaltic Cu (Cox and Singer, 1986; model 23) |
Mineral deposit model number | 23 |
Age of mineralization | Cretaceous? Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997). |
Alteration of deposit | Oxidation. |
Workings or exploration | The deposits were explored by an adit that was caved by 1916. |
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Indication of production | None |
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve. |
MRDS Number | A011743 |
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ReferencesMacKevett, E.M., Jr., Cox, D.P., Potter, R.W., III, and Silberman, M.L., 1997, Kennecott-type deposits in the Wrangell Mountains, Alaska--High-grade copper ores near a basalt-limestone contact, in Goldfarb, R.J., and Miller, L.D., eds., Mineral deposits of Alaska: Economic Geology Monograph 9, p. 66-89.
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Reporters | Travis L. Hudson (Applied Geology, Inc.) |
Last report date | 1/12/2003 |