|Quadrangle map, 1:250,000-scale||ID|
|Quadrangle map, 1:63,360-scale||D-3|
|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 descriptionThis 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.|
|Workings or exploration||Battle Mountain Mining Company sampled the site in 1990.|
|Indication of production||None|
Bundtzen, T.K., and Laird, G.M., 1982, Geologic map of the Iditarod D-2 and eastern D-3 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 72, 1 sheet, scale 1:63,360.
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|