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Unnamed Prospect (ARDF - SI035; shore of Lake Morris southwest of Mount Fritz), Chichagof District, Sitka Borough, Alaska, USA

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The prospect is in West Chichagof-Yakobi Wilderness.
Location: The location of this prospect is only known approximately to be on the northeast shore of Lake Morris at the southwest foot of Mount Fritz. For this record, the prospect is plotted at an elevation of about 1,000 feet, 0.4 mile south-southwest of the center of sec. 36, T. 46 S., R. 56 E. It is location P-42 of Bittenbender and others (1999) and MAS no. 0021140304 (U.S. Bureau of Land Management, 2002).
Geology: Johnson and Karl (1985) map the rocks in the area of this prospect as Triassic(?) greenstone intruded by Tertiary(?) granodiorite. The rocks are cut by high-angle, mainly northwest-striking faults; the most prominent is the regional-scale Border Ranges Fault whose trace is a few hundred feet southwest of the prospect. Bittenbender and others (1999), citing Kimball (1982), describe the prospect as a disseminated copper deposit in the greenstone. They report secondary copper minerals on slip surfaces, but do not describe the primary copper mineral(s). Other copper-bearing deposits in Triassic(?) greenstone on northwest Chichagof Island (for example, SI036) contain chalcopyrite as their primary copper sulfide.
Age: The primary copper mineralization probably is Triassic, the probable age of the greenstone host rock.

Commodities (Major) - Cu
Development Status: Undetermined.
Deposit Model: Basaltic copper? (Cox and Singer, 1986; model 23).

Mineral List



1 entry listed. 1 valid mineral.

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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. 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]

 
Mineral and/or Locality  
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