Unnamed (near hill 3695 in northern Beaver Mountains)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities As; Cu; Hg; Mo; Pb; Sb; Zn
Ore minerals arsenopyrite; galena; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale D-3
Latitude 62.9125
Longitude -157.02037
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3, 700 feet, about 300 feet northwest of hill 3695 on a high ridge of the Beaver Mountains. It is at the head of a west fork of Tolstoi Creek in the NE1/4 NE1/4 section 34, T. 33 N., R. 41 W., of the Seward Meridian.

Geologic setting

Geologic description

This occurrence consists of quartz veins in a cupola of the Beaver Mountains stock and roof pendants of Upper Cretaceous volcanic rocks (Bundtzen and Laird, 1982; Bundtzen and Miller, 1997). The Beaver Mountain stock has been dated at 70.3 Ma. The deposit consists of: 1) massive arsenopyrite with minor pyrite and quartz; 2) quartz vein with pyrite, galena, and arsenopyrite veinlets; and 3) silicified andesite with grains of arsenopyrite. Grab samples of mineralization collected by the Battle Mountain Mining Company contain up to 12.9 parts per million (ppm) gold, 317.8 ppm silver, 1,423 ppm copper, 9,835 ppm lead, 4,394 ppm zinc, 29 ppm molybdenum, 1,911 ppm arsenic, 214.8 ppm antimony, and 3,849 parts per billion mercury (Szumigala, 1993).
Geologic map unit (-157.022727907011, 62.9118436217592)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Unknown; 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 Silicification.

Production and reserves

Workings or exploration Battle Mountain Mining Company sampled the site in 1990.
Indication of production None

References

References

Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286.
Szumigala, D.J., 1993, Gold mineralization related to Cretaceous-Tertiary magmatism in the Kuskokwim Mountains of west-central and southwestern Alaska: Los Angeles, University of California Ph.D. dissertation, 300 p.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)
Last report date 5/16/2003