Unnamed (south of Middle Fork of the White River)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcocite; native copper

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-3
Latitude 61.7278
Longitude -141.9079
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is high on the south valley wall of the Middle Fork of the White River. It is at an elevation of about 6,000 feet, 4,400 feet north-northeast of elevation 8233 in the NE1/4 of section 2, T. 2 S., R. 19 E. of the Copper River Meridian. This is locality 156 of MacKevett (1976); the location may be accurate to within a thousand feet.

Geologic setting

Geologic description

This old copper prospect is in Triassic Nikolai Greenstone, but no other information about it is available (Capps, 1916, p. 122; 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 (-141.910004908746, 61.72741794078)
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 Possibly some minor work.
Indication of production None

Additional comments

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

References

References

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