| Quadrangle map, 1:250,000-scale | MC |
|---|---|
| Quadrangle map, 1:63,360-scale | C-6 |
| Latitude | 61.5581 |
| Longitude | -143.1702 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | This prospect is the easternmost of several along the south valley wall of Hidden Creek (MacKevett, 1972). It is at an elevation of about 4,400 feet, 3,200 feet north-northeast of elevation 6610 near the southeast corner of section 35, T. 3 S., R. 12 E. of the Copper River Meridian. This is locality 117 of MacKevett (1976). The location is accurate to within about 1,000 feet. |
Geologic descriptionThis prospect consists of secondary copper minerals (assumed to be mostly malachite) and scattered bornite along faults in the Triassic Nikolai Greenstone (MacKevett, 1976). The deposits were explored by an adit about 100 feet long and by numerous surface workings. 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 | (-143.172283024584, 61.5576590379264) |
|---|---|
| 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 an adit about 100 feet long and by numerous surface workings. |
|---|---|
| Indication of production | None |
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve. | |
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.) |
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| Last report date | 1/12/2003 |