Quadrangle map, 1:250,000-scale | MC |
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Quadrangle map, 1:63,360-scale | C-8 |
Latitude | 61.693 |
Longitude | -143.9312 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This prospect is on the east valley wall of lower Lime Creek. it is at an elevation of about 3,700 feet, 4,500 feet southwest of elevation 6830, and 1,200 feet southeast of the center of section 15, T. 2 S., R. 8 E. of the Copper River Meridian. This is locality 167 of MacKevett (1976) and locality 13 of MacKevett and others (1978). The location is accurate to within about 100 feet. Cobb and MacKevett (1980) included this prospect under the name 'Lime Cr., tributary to Rock Cr.'. |
Geologic descriptionThe deposit at this prospect consists of bornite and minor chalcopyrite in small lenses, as disseminations, and in veins in Triassic Nikolai Greenstone (Moffit and Mertie, 1923; MacKevett, 1976). The copper-bearing minerals are partly associated with quartz and epidote and with quartz-calcite veins (Moffit and Maddren, 1909; Moffit and Mertie, 1923). The deposits were explored by two adits and open cuts. 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 | (-143.933293099939, 61.6925370494559) |
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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 | The prospects were explored by two adits and open cuts. |
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Indication of production | None |
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve. |
MRDS Number | A011754 |
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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 |