Unnamed (northeast of Ford Arm)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Ag; Cu

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale C-6
Latitude 57.5974
Longitude -135.8634
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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).

Geologic setting

Geologic description

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.
Geologic map unit (-135.86521106806, 57.5970416981187)
Mineral deposit model Disseminated sulfide deposit.

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None

Additional comments

This prospect is only known approximately and it may be in the West Chichagof-Yakobi Wilderness.

References

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.
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 H.C. Berg (U.S. Geological Survey)
Last report date 10/16/2004