Latitude: 57°52'56"N
Longitude: 136°28'11"W
The prospect is in West Chichagof-Yakobi Wilderness.
Location: This prospect is at an elevation of about 50 feet, east of outer Squid Bay and about 2.5 miles north of the south tip of Yakobi Island. The prospect is about 0.4 mile north-northeast of the center of sec. 15, T. 46 S., R. 55 E. It is location P-10 of Bittenbender and others (1999) and MAS no. 0021140079 (U.S. Bureau of Land Management, 2002). The location is accurate within about 0.2 mile.
Geology: Johnson and Karl (1985) map the rocks in the Squid Bay area as Cretaceous graywacke intruded by Tertiary gabbronorite and tonalite. Bittenbender and others (1999), citing the work of Kimball (1982) and Loney and others (1975), describe the prospect as a magmatic segregation, copper-nickel deposit in gabbronorite. A composite grab sample contained 0.38 percent copper and 0.05 percent nickel. These values and the geologic setting of the deposit suggest that the ore minerals probably are chalcopyrite, pentlandite, pyrrhotite, and pyrite, as they are, for example, at the nearly Bohemia Basin deposit (SI001).
Workings: Only surface sampling.
Age: The deposit probably is roughly contemporaneous with intrusion of the Tertiary gabbronorite host rock.
Commodities (Major) - Cu, Ni
Development Status: None
Deposit Model: Duluth Cu-Ni-PGE (Cox and Singer, 1986; model 5a).
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. 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. Kimball, A.L., 1982, Mineral land assessment of Yakobi Island and adjacent parts of Chichagof Island, southeastern Alaska: U. S. Bureau of Mines Mineral Land Assessment report, MLA 97-82, 199 p. Loney, R.A., Brew, D.A., Muffler, L.J.P., and Pomeroy, J.S., 1975, Reconnaissance geology of Chichagof, Baranof, and Kruzof Islands, southeastern Alaska: U.S. Geological Survey Professional Paper 792, 105 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 [Link dead. Jun 2011]]
Mineral List
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