Unnamed (head of Beaver Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu
Other commodities As; Hg; Pb; Sn; W
Ore minerals chalcopyrite; pyrite
Gangue minerals quartz; tourmaline; white mica

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale D-2
Latitude 62.88749
Longitude -156.97345
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on a steep, north-northwest trending ridge that separates the head of Beaver Creek to the east from Windy Creek to the west. The prospect is at an elevation of about 3,200 feet, about 0.3 mile southeast of peak 3544, in the SW1/4 SE1/4 section 4, T. 32 N., R. 41 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This prospect consists of chalcopyrite and pyrite in a tourmaline-quartz breccia near a N20E, steeply dipping, high-angle fault (Bundtzen and Laird, 1982). The size of the mineralized structure is not known. One grab sample from the breccia contained 2.00 percent copper, 110 parts per million (ppm) silver, 700 parts per billion (ppb) gold, and 300 ppm tungsten (Bundtzen and Laird, 1982; Miller, Bundtzen, and Gray, 2005). Grab samples of sulfide-quartz breccia collected by Battle Mountain Mining Company contained up to 10.7 parts per million gold, more than 50 ppm silver, 2,879 ppm copper, 983 ppm lead, 381 ppm arsenic, 4.2 ppm mercury, and 90 ppm tin (Szumigala, 1993).
Geologic map unit (-156.975807082045, 62.8868343551419)
Mineral deposit model Sn-polymetallic veins (Cox and Singer, 1986; model 20b).
Mineral deposit model number 20b
Age of mineralization Undated; may be related to emplacement of the Beaver Mountains stock which has been dated at 70.3 Ma (Bundtzen and Laird, 1982).
Alteration of deposit Greisen developed with tourmaline, quartz, and white mica.

Production and reserves

Workings or exploration The area was mapped and sampled by the U.S. Geological Survey and the Alaska Division of Geological and Geophysical Surveys in the late 1970s and in the 1980s. The area was studied by Anaconda Minerals Company in 1980 and 1981 (D. Obolewicz , written communication, 1981), and by Battle Mountain Mining Company in 1990 (Szumigala, 1993).
Indication of production None

References