Unnamed (unnamed glacier west of Guerin Glacier) (ARDF #MC112) Cu

Unnamed (unnamed glacier west of Guerin Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu
Other commodities	Ag; As
Ore minerals	malachite

Geographic location

Quadrangle map, 1:250,000-scale	MC
Quadrangle map, 1:63,360-scale	C-1
Latitude	61.5614
Longitude	-141.1171
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is on the west valley wall of an unnamed glacier about 3 miles west of Guerin Glacier, at the head of Cub Creek. The site is at an elevation of about 6,000 feet, 4,500 feet east of elevation 7745 in the SW1/4 of section 35, T. 3 S., R. 23 E. of the Copper River Meridian. This is locality 111 of MacKevett (1976); the location is accurate to within about 1,000 feet.

Geologic setting

Geologic description This occurrence consists of a 10- by 100-foot area in Triassic sedimentary rocks that has veinlets of copper-bearing minerals, mostly malachite (MacKevett, 1976). A sample of the mineralization contained 100 parts per million (ppm) silver, 1,500 ppm arsenic, and more than 20,000 ppm copper. Copper mineralization is widespread in Triassic volcanic and sedimentary rocks of the McCarthy quadrangle. It 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	(-141.119134584443, 61.5610507111426)
Mineral deposit model	Basaltic Cu (Cox and Singer, 1986; model 23)
Mineral deposit model number	23
Age of mineralization	Cretaceous? Copper mineralization is widespread in Triassic volcanic and sedimentary rocks of the McCarthy quadrangle. It 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 sampling.
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