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Good Enough

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals azurite; chalcocite; cuprite; malachite; native copper
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale D-8
Latitude 61.7718
Longitude -143.9392
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on a small unnamed north tributary to the upper Kluvesna River. It is at an elevation of about 4,000 feet, 5,100 feet east-southeast of Scotty Peak, and 2,000 feet west of Fall Creek. The site is about 1,600 feet north of the center of section 22, T. 1 S., R. 8 E. of the Copper River Meridian. This is locality 180 of MacKevett (1976); the location is accurate to within about 1,000 feet. Cobb and MacKevett (1980) included this prospect under the name 'Good Enough'.

Geologic setting

Geologic description

The deposit at this prospect consists of chalcocite with minor native copper, cuprite, malachite, and azurite that occur in veins, amygdule fillings, and replacements of Triassic Nikolai Greenstone (Moffit and Mertie, 1923, p. 112-113; MacKevett, 1976). Calcite and quartz commonly accompany the copper mineralization. Strong fracturing and faulting of the Nikolai Greenstone localized some veins. The deposits were explored with two short adits. 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 (-143.941297465028, 61.7713403175545)
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 Low-grade calcite, quartz, and epidote(?) veining and replacement of greenstone. Oxidation.

Production and reserves

Workings or exploration The deposits were explored with two short adits.
Indication of production None

Additional comments

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

References

MRDS Number A011764

References

Cobb, E.H., and MacKevett, E.M., Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the McCarthy quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-885, 156 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.
Moffit, F.H., and Mertie, J.B., Jr., 1923, The Kotsina-Kuskulana district, Alaska: U.S. Geological Survey Bulletin 745, 149 p.
Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003