Basoiniuer; Bauer and Soni Prospect, Chichagof District, Sitka Borough, Alaska, USA
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Location: The Basoiniuer patented claim block stretches southeast for about 0.5 mile from sea level at the northwest foot of Doolth Mountain. The center of the claim is 0.3 mile north-northeast of the center of sec. 26, T. 47 S., R. 57 E. It is location P-62 of Bittenbender and others (1999), location 26 of Cobb (1972, 1978), and MAS no. 0021140013 (U.S. Bureau of Land Management, 2002). Cobb and Reed and Coats (1941) call this property the Bauer and Soni prospect. The location is accurate.
Geology: Johnson and Karl (1985) map the rocks in the area of this prospect as Cretaceous graywacke and argillite interbedded with sparse, lenticular beds of basalt. The rocks are cut by numerous high-angle, mainly northwest-striking faults; they include the fault at the Chichagof Mine (SI093), which controls the mineralization there and whose trace passes through just northeast of this prospect. Reed and Coats (1941) describe the workings on the Bauer and Soni claims as an opencut and 20-foot tunnel. Bittenbender and others (1999), citing Still and Weir (1981), describe the Basoiniuer prospect as an auriferous quartz vein in graywacke. Samples contained traces of gold and silver. There is no record of production. Isotopic studies indicate that the gold-quartz veins in coastal southern and southeastern Alaska are Eocene, about 50 Ma in age (Haeussler, 1995; Goldfarb, 1997; Goldfarb and others, 1997). ARDF record SI087 provides an overview of the geology of auriferous quartz veins in the Chichagof Mining District.
Workings: Reed and Coats (1941) describe the workings on the Bauer and Soni claims as an opencut and 20-foot tunnel.
Age: Isotopic studies indicate that the gold-quartz veins in coastal southern and southeastern Alaska are Eocene, about 50 Ma in age (Haeussler and others, 1995; Goldfarb, 1997; Goldfarb and others, 1997).
Production: There is no record of production.
Commodities (Major) - Ag, Au
Development Status: Undetermined.
Deposit Model: Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
2 entries listed. 2 valid minerals.
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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. 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. Goldfarb, R J., 1997, Metallogenic evolution of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 4-34. Goldfarb, R.J., Miller, L.D., Leach, D.L., and Snee, L.W, 1997, Gold deposits in metamorphic rocks in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 151-190. Haeussler, P J., Bradley, D., Goldfarb, R., Snee, L., and Taylor, C., 1995, Link between ridge subduction and gold mineralization in southern Alaska: Geology, v. 23, no. 11, p. 995-998. Johnson, B.R, and Karl, S.M., 1985, Geologic map of western Chichagof and Yakobi Islands, southeastern Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map 1-1506, 1 sheet, scale 1:125,000. Reed, J.C., and Coats, R.R., 1941, Geology and ore deposits of the Chichagof mining district, Alaska: U.S. Geological Survey Bulletin 929, 148 p. Still, J.C., and Weir, K.R., 1981, Mineral land assessment of the west portion of western Chichagof Island, Alaska: U. S. Bureau of Mines Open-File Report 89-81, 168 p. 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]