Unnamed (head of Sheep Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcocite; cuprite; malachite; native copper
Gangue minerals calcite; zeolite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-2
Latitude 61.6742
Longitude -141.6651
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at the head of Sheep Creek, a south tributary to the White River. It is at an elevation of about 5,900 feet, 4,000 feet northeast of elevation 6696, in the SE1/4 of section 19, T. 2 A., R. 21 E. of the Copper River Meridian. This is locality 148 of MacKevett (1976); the location is is accurate to within about 1,000 feet.

Geologic setting

Geologic description

This deposit consists of native copper, chalcocite, cuprite, malachite, calcite, and zeolite(?) that fill amygdules in Triassic Nikolai Greenstone (Capps, 1916; MacKevett, 1976). The deposits were explored by an adit that was caved by 1916. 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 (-141.66719143189, 61.6738280119023)
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.

Production and reserves

Workings or exploration The deposits were explored by an adit that was caved by 1916.
Indication of production None

Additional comments

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

References

MRDS Number A011743

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