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  3. Alaska Resource Data File (ARDF)

Unnamed (east of Slana River)

Occurrence, Undetermined

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcocite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-1
Latitude 63.0522
Longitude -144.2867
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

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.
Geologic map unit (-144.28892907586, 63.0518122730454)
Mineral deposit model Float from a chalcocite vein, possibly a Kennecott-type occurrence or Basaltic Cu (Cox and Singer, 1986; model 23?).
Mineral deposit model number 23?
Age of mineralization Late Triassic or younger, on the basis of the age of potential host rocks.

Production and reserves

Workings or exploration Only limited surface sampling and reconnaissance mapping.
Indication of production None

References

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 Mines and Minerals Geologic Report 30, 30 p., 2 sheets, scale 1:63,360.
Richter, D.H., Matson, N.A., Jr., and Schmoll, H.R., 1976, Geologic map of the Nabesna C-4 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1303, 1 sheet, scale 1:63,360.
Reporters W.T. Ellis (Alaska Earth Sciences) and C.C Hawley (Hawley Resource Group)
Last report date 7/14/2003