Unnamed (south of Middle Fork of the White River) (ARDF #MC098) Cu

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 Capps, S.R., 1916, The Chisana-White River district, Alaska: U.S. Geological Survey Bulletin 630, 130 p. 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