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Unnamed Occurrence (ARDF - ID016; ridge at head of Brown Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: This occurrence is on top of a prominent east-west trending ridge north of the headwaters of Beaver Creek. It is at an elevation of about 3,300 feet, about 0.6 mile west-southwest of the center of section 33, T. 33 N., R. 40 W., of the Seward Meridian.
Geology: This occurrence is in a roof pendant of volcanic rocks near the eastern contact of the 70.9 Ma, Beaver Mountains stock (Bundtzen and Laird, 1982; Miller and Bundtzen, 1994). The occurrence consists of tourmaline-quartz-sulfide veinlets in hornfelsed andesite. One grab sample of mineralization collected by Battle Mountain Mining Company contained 91 parts per billion (ppb) gold, 129.9 parts per million (ppm) silver, 4,879 ppm copper, 1.71 percent lead, 1.78 percent zinc, more than 2,000 ppm arsenic, and 103 ppm antimony (Szumigala, 1993).
Workings: Surface sampling was conducted by Battle Mountain Mining Company in 1990 (Szumigala, 1993).
Age: Undated; probably related to the emplacement of the Beaver Mountains stock that has an age of 70.3 Ma (Bundtzen and Laird, 1982).

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

Mineral List



2 entries listed. 1 valid mineral.

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References

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. Miller, M.L., and Bundtzen, T.K., 1994, Generalized geologic map of the Iditarod quadrangle, Alaska showing potassium-argon, major oxide, trace element, fossil, paleocurrent, and archeological sample localities: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-A, 48 pages; 1 sheet, scale 1:250,000. 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.

Mineral and/or Locality  
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