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Unnamed (west side of Donoho Peak)

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals azurite; chalcocite; malachite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-6
Latitude 61.5594
Longitude -142.9785
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the south end of the ridge between Kennicott and Root Glaciers (MacKevett, 1972). It is at an elevation of about 5,400 feet, 1,500 feet northwest of Donoho Peak (elevation 6696) and 4,500 feet east of Kennicott Glacier. This is locality 115 of MacKevett (1976). It is accurate to within a few hundred feet.

Geologic setting

Geologic description

This prospect consists of sparsely distributed secondary copper minerals and chalcocite that are localized along a fault (MacKevett, 1976). The prospect which is explored by a short adit is in Triassic Chitistone Limestone near the contact with underlying Triassic Nikolai Greenstone (MacKevett, 1972).
Geologic map unit (-142.980584605041, 61.5589634368461)
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.

Production and reserves

Workings or exploration The prospect was explored by a short adit.
Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References

MRDS Number A011729

References

MacKevett, E.M., Jr., 1972, Geologic map of the McCarthy C-6 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-979, 1 sheet, scale 1:63,360.
MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, 2 sheets, scale 1:250,000.
MacKevett, 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.
Silberman, M.L., MacKevett, E.M., Jr., Connor, C.L., and Mathews, A., 1980, Metallogenic and tectonic significance of oxygen isotope data and whole-rock potassium-argon ages of Nikolai Greenstone, McCarthy quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-2019, 31 p.
Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003