Unnamed Prospect (ARDF - ID006; north of upper Billy Goat Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: 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).
Workings: 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).
Age: Undated; may be related to emplacement of the Beaver Mountains stock which has been dated at 70.3 Ma. (Bundtzen and Laird, 1982).
Commodities (Major) - Ag, Cu; (Minor) - Bi, Pb, Sb, Sn, Zn
Development Status: None
Deposit Model: Sn-polymetallic veins (Cox and Singer, 1986; model 20b).
5 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. 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. Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet. 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.