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  3. Alaska Resource Data File (ARDF)

Unnamed (southwest of head of 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 55.3161
Longitude -132.78447
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is probably about 0.2 mile northeast of hill 2337 and about 0.6 mile north-northwest of the center of section 3, T. 76 S., R. 83 E. The location is accurate to within 0.2 mile.

Geologic setting

Geologic description

The occurrence consists of calcareous greenstone that contains pyrite and minor chalcopyrite (Clark and others, 1970 [OF 417]). The greenstone is probably part of the Wales Group of Cambrian and older age (Eberlein and others, 1983; Brew, 1996).
Geologic map unit (-132.786115620175, 55.3157478350274)
Age of mineralization Unknown, other than that the deposit is in rocks of Cambrian or older age.

Production and reserves

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

References

MRDS Number A010182

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