1. Mineral Resources
  2. Online Spatial Data
  3. Alaska Resource Data File (ARDF)

Unnamed (west of upper Twelvemile Arm)

Occurrence, Undetermined

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale B-3
Latitude 55.36461
Longitude -132.79225
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is probably about 0.2 mile west of the top of hill 2150 and about 0.5 mile west-southwest of the center of section 15, T. 75 S., R. 83 E.

Geologic setting

Geologic description

At this occurrence, Clark and others (1970 [OF 417] report pyrite and minor chalcopyrite in greenschist of the Wales Group of Late Proterozoic and Cambrian age (Eberlein and others, 1983; Brew, 1996).
Geologic map unit (-132.793894826069, 55.3642575920207)
Age of mineralization Pyrite and chalcopyrite occur in greenschist of the Wales Group of Late Proterozoic and Cambrian age.

Production and reserves

Workings or exploration Only brief examination by government geologists.
Indication of production None

References

MRDS Number A010176

References

Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000.
Clark, A.L., Berg, H C., Grybeck, D.J., Ovenshine, A.T., and Wehr, Raymond, 1970, Analyses of rock and stream-sediment samples from the Craig B-3 quadrangle, Alaska: U.S. Geological Survey Open-File Report 417, 100 p.
Cobb, E. H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-869, 262 p.
Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A. T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, 52 p.
Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004