Unnamed (west of East Point)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Ore minerals chalcopyrite; galena; pyrite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale D-3
Latitude 57.8065
Longitude -134.9705
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 600 feet in a rock pit along a logging road 0.8 mile west of East Point at the mouth of Tenakee Inlet. The occurrence is 0.2 mile south-southeast of the center of sec. 12, T. 47 S., R. 64 E. It is location P-23 of Bittenbender and others (1999) and MAS no. 0021140303 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.2 mile.

Geologic setting

Geologic description

The rocks in the vicinity of this occurrences are part of the Devonian and/or Silurian, Kennel Creek Limestone which consists of limestone, minor dolomite, limestone breccia, shale, siltstone, and conglomerate (Lathram and others, 1965). Bittenbender and others (1999) collected samples in a (borrow?) pit of mineralized marble and basalt with pyrite. One limestone boulder contained up to 50% sphalerite in clots; another sample of marble contained up to 20 percent sphalerite, 1 percent galena, and chalcopyrite. High grade samples contained up to 26 percent zinc, 1.74 percent lead, 460 parts per million (ppm) copper, and 52 ppm silver.
Geologic map unit (-134.97227758725, 57.8061614584537)
Mineral deposit model Silver, copper, lead, and zinc minerals in marble.
Age of mineralization Silurian or younger based on the age of the host rock.

Production and reserves

Workings or exploration Apparently only surface sampling by government agencies.
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 Donald Grybeck (U.S. Geological Survey)
Last report date 5/5/2005