Unnamed (north of upper Billy Goat Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Cu
Other commodities Bi; Pb; Sb; Sn; Zn
Ore minerals chalcopyrite; galena; sphalerite
Gangue minerals quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale D-3
Latitude 62.86662
Longitude -157.00627
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 3,200 feet near the top of the steep headwall of a cirque that is north of the head one of the upper tributaries of Billy Goat Creek. The prospect is about 0.6 mile east-southeast of the northwest corner of section 17, T. 32 N., R. 41 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This prospect consists of disseminated chalcopyrite with minor galena and sphalerite, and their oxidation products. The sulfides are in a N70E, high-angle fracture zone in andesite, which is a roof pendant over the western part of the 70.9 Ma, Beaver Mountain pluton (Bundtzen and Laird, 1982; Miller, and Bundtzen, 1994). No size or orientation of the mineralized zone is available. One grab sample of mineralization collected by the Alaska Division of Geological and Geophysical Surveys contained 55.3 parts per million (ppm) silver, 0.50 percent copper, 0.70 percent lead, 900 ppm zinc, 100 ppm bismuth, 200 ppm antimony, and 60 ppm tin (Bundtzen and Laird, 1982; Miller, Bundtzen, and Gray, 2005). Grab samples collected by Battle Mountain Mining Company contained up to 1,730 parts per billion (ppb) gold, 87.1 ppm silver, 589 ppm copper, 1.61 percent lead, 6,232 ppm zinc, and 319 ppm antimony (Szumigala, 1993).
Geologic map unit (-157.008626608838, 62.8659617409695)
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).

Production and reserves

Workings or exploration Surface sampling was conducted by the Alaska Division of Geological and Geophysical Surveys and U.S. Geological Survey in 1979 and the mid 1980s. The prospect was investigated by Noranda Exploration in 1983 and by Battle Mountain Mining Company in 1990 (John Dunbier, oral communication, 1983; Szumigala, 1993).
Indication of production None

References