Unnamed (east of lower Russell Glacier) (ARDF #MC101) Cu

Unnamed (east of lower Russell Glacier)

Prospect, Inactive

Commodities and mineralogy

Main commodities	Cu
Ore minerals	chalcocite; native copper
Gangue minerals	calcite; prehnite

Geographic location

Quadrangle map, 1:250,000-scale	MC
Quadrangle map, 1:63,360-scale	C-3
Latitude	61.6453
Longitude	-141.7857
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This prospect is east of lower Russell Glacier. It is at an elevation of about 5,000 feet, 6,000 feet northwest of elevation 7316, and 7,700 feet north-northeast of elevation 6510. The site is in the SE1/4 of section 33, T. 2 S., R. 20 E. of the Copper River Meridian. This is locality 151 of MacKevett (1976); the location is accurate to within 1,000 feet.

Geologic setting

Geologic description This deposit consists of amygdule-fillings and veinlets of intergrown prehnite, calcite, chalcocite, and native copper in Triassic Nikolai Greenstone (Moffit and Knopf, 1910, p. 56; 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	(-141.787786421394, 61.6449212843591)
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

Indication of production	None
Additional comments The locality is in the Wrangell-Saint Elias National Park and Preserve.

References

MRDS Number	A011744
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. Moffit, F.H., and Knopf, Adolph, 1910, Mineral resources of the Nabesna-White River district, Alaska, with a section on the Quaternary by S.R. Capps: U.S. Geological Survey Bulletin 417, 64 p.
Reporters	Travis L. Hudson (Applied Geology, Inc.)
Last report date	1/12/2003