Unnamed (south of lower Glacier Creek) (ARDF #MC156) Cu

Unnamed (south of lower Glacier Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities	Cu
Other commodities	Ag; Au
Gangue minerals	calcite

Geographic location

Quadrangle map, 1:250,000-scale	MC
Quadrangle map, 1:63,360-scale	B-4
Latitude	61.4362
Longitude	-142.3996
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This prospect is on the ridge south of lower Glacier Creek. It is about 6,000 feet upslope (southwest) from the Nelson mine (MC154) on the east side of hill 6640. The site is near the center of the NE1/4 of section 17, T. 5 S., R. 17 E. of the Copper River Meridian. This is locality 68 of MacKevett (1976); the location is accurate to within about 1,000 feet.

Geologic setting

Geologic description The deposit at this prospect consists of calcite-rich veins up to 3 feet thick in the lower part of the Triassic Chitistone Limestone (MacKevett, 1976). A sample contained 1 part per million (ppm) silver, 0.1 ppm gold, and 2,000 ppm copper (MacKevett and Smith, 1968). The prospect was explored with surface pits and trenches. Mineralization at this prospect may be related to the widespread copper mineralization in the Triassic Nikolai Greenstone and Chitistone Limestone that 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	(-142.401659752719, 61.4357772437551)
Age of mineralization	Cretaceous? Mineralization at this prospect may be related to the widespread copper mineralization in the Triassic Nikolai Greenstone and Chitistone Limestone that 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	The prospect was explored with surface pits and trenches.
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., and Smith, J.G., 1968, Distribution of gold, copper, and some other metals in the McCarthy B-4 and B-5 quadrangles, Alaska: U.S. Geological Survey Circular 604, 25 p. 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