|Ore minerals||chalcocite; native copper|
|Gangue minerals||calcite; prehnite|
|Quadrangle map, 1:250,000-scale||MC|
|Quadrangle map, 1:63,360-scale||C-3|
|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 descriptionThis 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).|
|Indication of production||None|
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve.
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|