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Unnamed Occurrence (ARDF - ID005; near hill 3695 in northern Beaver Mountains), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: 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.
Geology: 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).
Workings: Battle Mountain Mining Company sampled the site in 1990.
Age: Unknown; may be related to emplacement of the Beaver Mountains stock which has been dated at 70.3 Ma (Bundtzen and Laird, 1982).
Alteration: Silicification.

Commodities (Major) - Ag, Au; (Minor) - As, Cu, Hg, Mo, Pb, Sb, Zn
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).

Mineral List

4 entries listed. 4 valid minerals.

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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.

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