Unnamed (southwest of Ushk Bay)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Ag; Cu; Mo

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale C-6
Latitude 57.5265
Longitude -135.7479
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 1,000 feet, about 3 miles southwest of the head of Ushk Bay. For this record, the site is plotted 0.6 mile northwest of the center of sec. 23, T. 50 S., R. 60 E. It is location P-93 of Bittenbender and others (1999) and MAS no. 0021140130 (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 Mesozoic or Paleozoic, amphibolite, gneiss, schist, and marble, and as undivided siliceous metasedimentary and metavolcanic rocks. The rocks are cut by high-angle, mainly northwest-striking faults.
Bittenbender and others (1999), mainly citing Kimball (1982), describe the occurrence as a disseminated sulfide deposit in Triassic(?) greenstone and amphibolite. Samples contained up to 220 parts per million (ppm) copper, 0.7 ppm silver, and 100 ppm molybdenum.
Geologic map unit (-135.749701810622, 57.5261447171337)
Mineral deposit model Disseminated sulfide deposit.

Production and reserves

Workings or exploration Only limited surface sampling.
Indication of production None

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