| Quadrangle map, 1:250,000-scale | MC |
|---|---|
| Quadrangle map, 1:63,360-scale | C-6 |
| Latitude | 61.5402 |
| Longitude | -143.1685 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | This prospect is in the valley of Glacier Gulch, a south tributary to Hidden Creek. It is at an elevation of about 4,300 feet, 4,000 feet south-southeast of elevation 6610 and 3,300 feet northeast of the center of section 11, T. 4 S., R. 12 E. of the Copper River Meridian. This is locality 100 of MacKevett (1976). It is accurate to within about 1,000 feet. |
Geologic descriptionThis prospect consists of veins and fracture coatings of malachite and rare bornite in fractured Triassic Nikolai Greenstone (Moffit and Maddren, 1909; MacKevett, 1976). The prospect was explored by a short adit and surface pits and trenches. 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 | (-143.170581453252, 61.5397583214825) |
|---|---|
| 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 prospect was explored by a short adit and surface pits and trenches. |
|---|---|
| Indication of production | None |
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve. | |
| MRDS Number | A011730 |
|---|---|
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 |