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Baldy

Prospect, Probably inactive

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Commodities and mineralogy

Main commodities Cu; W
Ore minerals chalcopyrite; hematite; magnetite; pyrrhotite
Gangue minerals garnet; pyroxene; quartz

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale D-4
Latitude 57.7961
Longitude -135.0361
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Baldy prospect is at an elevation of about 2,300 feet, about 2 miles northeast of Cannery Point in Tenakee Inlet. The prospect is 0.5 mile northwest of the center of sec. 15, T. 47 S., R. 64 E. It is location P-25 of Bittenbender and others (1999) and MAS no. 0021140010 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.2 mile.

Geologic setting

Geologic description

This prospect is at the contact of Cretaceous granodiorite with the Devonian, Kennel Creek Limestone which consists of limestone, minor dolomite, limestone breccia, shale, and siltstone (Lathram and others, 1965). The contact is marked by oxidized masses of skarn composed of magnetite, garnet, pyroxene, hematite, and minor quartz. (Buddington, 1925) The skarn contains chalcopyrite and pyrrhotite. Bittenbender and others (1999) collected samples that contained up to 0.29 percent copper and 240 ppm tungsten.
Geologic map unit (-135.037877749851, 57.7957607112188)
Mineral deposit model Copper-tungsten skarn.
Age of mineralization Probably related to the adjacent Cretaceous granodiorite pluton.
Alteration of deposit Oxidization; formation of skarn.

Production and reserves

Workings or exploration Three claims were staked prior to 1925; only surface sampling by government geologists since.
Indication of production None

References

MRDS Number A013292; A013293

References

Bittenbender, P., Still, J.C., Maas, K., and McDonald, M., Jr., 1999, Mineral resources of the Chichagof and Baranof Islands area, southeast Alaska: Bureau of Land Management, BLM-Alaska Technical Report 19, 222 p.
Buddington, A.F., 1925, Mineral investigations in southeastern Alaska: U.S. Geological Survey Bulletin 773-B, p. 71-139.
Cobb, E.H., 1972, Metallic mineral resources map of the Sitka quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-467, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Sitka quadrangle: U.S. Geological Survey Open-File Report 78-450, 124 p.
Lathram, E.H., Pomeroy, J.S., Berg, H.C., and Loney, R.A., 1965, Reconnaissance geology of Admiralty Island, Alaska: U.S. Geological Survey Bulletin 1181-R, p. R1-R48.
U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]
Reporters Donald Grybeck (U.S. Geological Survey)
Last report date 5/5/2005