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Skolai Mining Company

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcocite; malachite
Gangue minerals calcite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-3
Latitude 61.716
Longitude -141.8395
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 setting

Geologic description

At 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.

Production and reserves

Workings or exploration Surface cuts to 18 feet long explored this deposit (Capps, 1916, p. 123).
Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References

MRDS Number A011746

References

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