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Unnamed Occurrence (ARDF - SI120; northeast of Ford Arm), Chichagof District, Sitka Borough, Alaska, USA

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This prospect is only known approximately and it may be in the West Chichagof-Yakobi Wilderness.
Location: The location of this occurrence is only known approximately to be at an elevation of about 950 feet, midway between lakes 43 and 423, northeast of Ford Arm. For this record, the site is plotted 0.5 mile northeast of the center of sec. 25, T. 49 S., R. 59 E. It is location P-87 of Bittenbender and others (1999) and MAS no. 0021140128 (U.S. Bureau of Land Management, 2002).
Geology: Johnson and Karl (1985) map the rocks in the area of this occurrence as Cretaceous(?) phyllite and Cretaceous greenstone. The rocks are cut by steeply-dipping, mainly northwest-striking faults, including the regional-scale Border Ranges Fault whose trace is about 0.5 mile northeast of the occurrence. Bittenbender and others (1999), citing Kimball (1982), describe the occurrence as a disseminated sulfide deposit in chlorite schist, hornfels, chert, and greenstone. Samples contained up to 300 parts per million (ppm) copper and 0.5 ppm silver.
Workings: Only surface sampling.

Commodities (Major) - Ag, Cu
Development Status: None
Deposit Model: Disseminated sulfide deposit.

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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]

 
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