Latitude: 63°3'7"N
Longitude: 144°17'13"W
Location: The occurrence is on the west side of a steep ridge about 1.25 miles east of Slana River and 2 miles southwest of Gillett Pass at an elevation of about 4,600 feet. The occurrence is about 0.1 mile west-northwest of the center of section 28, T. 15 N., R. 6 E., Copper River Meridian. The site corresponds to locality 4 of Richter (1967) and locality 34 on figure 6 of Cobb (1979 [OFR 79-238]). The location is accurate within 0.1 mile.
Geology: A piece of chalcocite about 2 inches in diameter was found in talus below an outcrop of Nikolai Greenstone overlain by upper Triassic limestone (Richter and others, 1977). These units were formerly mapped as Slana basalt and Jack limestone by Richter (1967). The area is cut by west-northwest-trending faults and small cross faults. The west-northwest faults are subparallel to the Denali Fault that is about 2 miles north-northeast (Richter, 1967). A stream-sediment sample collected in the drainage below the sample was not anomalous in copper.
Workings: Only limited surface sampling and reconnaissance mapping.
Age: Late Triassic or younger, on the basis of the age of potential host rocks.
Commodities (Major) - Cu
Development Status: None
Deposit Model: Float from a chalcocite vein; possibly a Kennecott-type occurrence or Basaltic
References
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-238, 140 p. Richter, D.H., 1967, Geology of the upper Slana-Mentasta Pass area, southcentral Alaska: Alaska Division of Geological and Geophysical Surveys Geological Report 30, 27 p., 2 sheets, scale 1:63,360. Richter, D.H., Sharp, W.N., Dutro, J.T., Jr., and Hamilton, W.B., 1977, Geologic map of parts of the Mount Hayes A-1 and A-2 quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1031, 1 sheet, scale 1:63,360.
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