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Unnamed (near head of Geohenda Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals cuprite; malachite; native copper

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale D-3
Latitude 61.8906
Longitude -141.9375
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is near the head of Geohenda Creek. It is at an elevation of about 5,250 feet, 4,000 feet northeast of elevation 5390 and 2,000 feet northwest of elevation 5490. The site is 2,000 feet south of the center of section 4, T. 1 N., R. 19 E., of the Copper River Meridian. This is locality 184A of MacKevett (1976); the location is probably accurate to within 1,000 feet.

Geologic setting

Geologic description

This occurrence consists of native copper, malachite, and cuprite that fill amygdules in a small isolated outcrop of Triassic Nikolai Greenstone (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 (-141.939622333623, 61.8902239333035)
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).

Production and reserves

Workings or exploration Limited surface examination.
Indication of production None

Additional comments

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

References

References

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.
Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003