|Ore minerals||bornite; chalcocite; malachite|
|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 on the west valley wall of the upper White River. It is at an elevation of about 4,900 feet in a small drainage 2,500 feet south of elevation 6337, in the southwest corner of section 5, T. 2 S., R. 20 E. of the Copper River Meridian. This is locality 155 of MacKevett (1976); the location is accurate to within about 1,000 feet.|
Geologic descriptionAt this prospect, thin malachite-, bornite-, and chalcocite-bearing veins occur along small faults cutting Triassic Nikolai Greenstone (Capps, 1916; MacKevett, 1976). Reticulating veins of calcite and malachite coat some fracture surfaces. Surface cuts to 18 feet long explored this deposit (Capps, 1916, p. 123). 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||(-141.841602320853, 61.7156211606187)|
|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).|
|Alteration of deposit||Oxidation.|
|Workings or exploration||Surface cuts to 18 feet long explored this deposit (Capps, 1916, p. 123).|
|Indication of production||None|
Additional commentsThe locality is in the Wrangell-Saint Elias National Park and Preserve.
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|