Unnamed (between Waterfall Cove and Fick Cove)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Cu; Zn
Ore minerals pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale C-6
Latitude 57.575
Longitude -135.7881
Nearby scientific data Find additional scientific data near this location
Location and accuracy The location of this occurrence is only known approximately to be about midway between Waterfall Cove in Slocum Arm and Fick Cove in the South Arm of Hoonah Sound. For this record, the site is plotted 0.2 mile southeast of the center of sec. 33, T. 49 S., R. 60 E. The location of this occurrence may be several miles or more from the coordinates given here. It is location P-88 of Bittenbender and others (1999) and MAS no. 0021140306 (U.S. Bureau of Land Management, 2002).

Geologic setting

Geologic description

Johnson and Karl (1975) map the rocks in the area of this occurrence as Triassic(?) greenstone intruded by northwest-trending, elongate stocks of Cretaceous or Jurassic gabbro and tonalite. The rocks are cut by steeply-dipping, mainly northwest-striking faults; these include the regional-scale Border Ranges Fault whose trace is about a mile southwest of this occurrence.
Bittenbender and others (1999), citing Kimball (1982), describe the occurrence as a disseminated sulfide deposit in schist and gneiss, near the contact between Triassic(?) greenstone and marble. Samples of pyrite- and pyrrhotite-bearing schist and gneiss assayed up to 360 parts per million (ppm) copper and 1,600 ppm zinc.
Geologic map unit (-135.789905738889, 57.5746440805736)
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