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Unnamed (near south arm of Dawes Glacier)

Occurrence, Probably inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale SD
Quadrangle map, 1:63,360-scale B-4
Latitude 57.4367
Longitude -132.80351
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on peak 5010, which is about 7.7 miles north-northeast of the east end of Glory Lake. It is about 0.3 mile north of the center of section 19, T. 51 S., R. 79 E.

Geologic setting

Geologic description

This occurrence consists of biotite-quartz gneiss with disseminated pyrite and chalcopyrite (Clark and others, 1970 [OF 70-74]). The gneiss is part of the Coast Plutonic complex of Tertiary or Cretaceous age (Gehrels and Berg, 1992) . A sample contained 70 ppm copper.
Geologic map unit (-132.805202270199, 57.4363658893926)
Mineral deposit model Disseminated pyrite and chalcopyrite in gneiss.
Age of mineralization Sulfides disseminated in gneiss of probably Tertiary or Cretaceous (metamorphic) age; the age of the protolith is unknown.

Production and reserves

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

References

MRDS Number AO13361

References

Clark, A.L., Brew, D.A., Grybeck, D.J., and Wehr, Raymond, 1970, Analyses of rock and stream-sediment samples from the Sumdum B-4 quadrangle, Alaska: U.S. Geological Survey Open-File Report 70-74, 104 p., 1 sheet, scale 1:63,360.
Gehrels, G.E., and Berg, H.C., 1992, Geologic map of southeastern Alaska: U.S. Geological Survey Miscellaneous Investigations Map I-1867, 24 p., 1 sheet, scale 1:600,000.
Reporters Donald Grybeck (U.S. Geological Survey)
Last report date 10/8/2004