Main commodities | Ag; Cu |
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Ore minerals | chalcocite; covellite; malachite; pyrrhotite |
Quadrangle map, 1:250,000-scale | MC |
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Quadrangle map, 1:63,360-scale | B-4 |
Latitude | 61.3747 |
Longitude | -142.4321 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This prospect is at the head of Dan Creek (MacKevett and Smith, 1972). It is at an elevation of about 4,000 feet, 5,100 feet west-northwest of Joshua Green Peak, and 4,000 feet east-southeast of Nikolai Butte. The site is in the SW1/4 of section 6, T. 6 S., R. 17 E. of the Copper River Meridian. This is locality 54 of MacKevett (1976); the location is accurate to within a few hundred feet. |
Geologic descriptionThe deposit at this prospect consists of scattered veins up to 5 centimeters wide that contain chalcocite, pyrrhotite, covellite and malachite along joints in Triassic Nikolai Greenstone (MacKevett, 1976). A sample of the veins contained 30 parts per million (ppm) silver and more than 20,000 ppm copper (MacKevett and Smith, 1968, sample 53). The deposit was explored by a 15-foot-long adit (MacKevett, 1976). Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997). | |
Geologic map unit | (-142.434151179473, 61.3742736835665) |
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Mineral deposit model | Basaltic Cu (Cox and Singer, 1986; model 23) |
Mineral deposit model number | 23 |
Age of mineralization | Cretaceous? Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997). |
Alteration of deposit | Oxidation. |
Workings or exploration | The deposit was explored with a 15-foot-long adit (MacKevett, 1976). |
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Indication of production | None |
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve. |
MRDS Number | A011696 |
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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 |