|Quadrangle map, 1:250,000-scale||SI|
|Quadrangle map, 1:63,360-scale||D-4|
|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 descriptionThis 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.|
|Workings or exploration||Three claims were staked prior to 1925; only surface sampling by government geologists since.|
|Indication of production||None|
|MRDS Number||A013292; A013293|
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|