Main commodities | Cu |
---|---|
Ore minerals | bornite; chalcocite; chalcopyrite |
Quadrangle map, 1:250,000-scale | MC |
---|---|
Quadrangle map, 1:63,360-scale | C-8 |
Latitude | 61.7307 |
Longitude | -143.9861 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This prospect is west of the lower Kluvesna River. It is at an elevation of about 2,400 feet near the southeast corner of section 32, T. 1 S., R 8 E. of the Copper River Meridian. This is locality 177 of MacKevett (1976) and locality 1 of MacKevett and others (1978). The location is accurate to within about 100 feet. |
Geologic descriptionThe deposit at this prospect consists of chalcocite, bornite, and chalcopyrite that are sparsely disseminated in iron-stained Triassic Nikolai Greenstone near its contact with overlying Triassic Chitistone Limestone (Moffit and Mertie, 1923; MacKevett, 1976). The deposits were explored by 4 adits and several 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 | (-143.988196793224, 61.7302370510395) |
---|---|
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 deposits were explored by 4 adits and several open cuts. |
---|---|
Indication of production | None |
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve. |
MRDS Number | A011761 |
---|---|
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.
| |
Reporters | Travis L. Hudson (Applied Geology, Inc.) |
Last report date | 1/12/2003 |