Quadrangle map, 1:250,000-scale | MC |
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Quadrangle map, 1:63,360-scale | C-8 |
Latitude | 61.7066 |
Longitude | -143.9609 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This prospect is on the west bank of lower Rock Creek. It is at an elevation of about 2,500 feet, 5,800 feet northwest of elevation 5282, and 1,500 feet east-southeast of the center of section 9, T. 2 S., R. 8 E. of the Copper River Meridian. This is locality 169 of MacKevett (1976) and locality 8 of MacKevett and others (1978). The location is accurate to within about 100 feet. Cobb and MacKevett (1980) included this prospect under the name 'Warner'. |
Geologic descriptionThe deposit at this prospect consists of a brecciated quartz-calcite vein up to 1 meter thick that contains minor amounts of bornite, chalcopyrite. and malachite (Moffit and Mertie, 1923; MacKevett, 1976). The vein is in Triassic Nikolai Greenstone. A sample of the mineralization contained 5 parts per million (ppm) silver and 20,000 ppm copper (MacKevett, 1976). A 25-foot-long adit explored this deposit. The widespread deposition of copper in Triassic greenstone and limestone of the area is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic or Early Cretaceous (MacKevett and others, 1997). Copper-bearing minerals were deposited in the underlying Nikolai Greenstone at about 112 Ma (Silberman and others, 1980). | |
Geologic map unit | (-143.962994792142, 61.7061368863366) |
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Mineral deposit model | Basaltic Cu (Cox and Singer, 1986; model 23) |
Mineral deposit model number | 23 |
Age of mineralization | Cretaceous? The widespread deposition of copper in Triassic greenstone and limestone of the area is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic or Early Cretaceous (MacKevett and others, 1997). Copper-bearing minerals were deposited in the underlying Nikolai Greenstone at about 112 Ma (Silberman and others, 1980). |
Alteration of deposit | Oxidation. |
Workings or exploration | A 25-foot-long adit explored this deposit. |
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Indication of production | None |
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve. |
MRDS Number | A011755 |
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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 |