Unnamed Occurrence (ARDF - ID129; southwest of Beaver Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This previously undescribed placer occurrence is in an unnamed gulch about 5 miles upstream from the mouth of Beaver Creek. The rocks in the vicinity are shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The nonmagnetic fraction of a concentrate panned from stream alluvium contained visible grains of gold (Bennett and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey in 1985 (Bennett and others, 1988).
Age: Probably Quaternary.
Commodities (Major) - Au
Development Status: None
Deposit Model: Placer Au deposit (Cox and Singer, 1986; model 39a).
1 entry listed. 1 valid mineral.
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Bennett, G.J., Gray, J.E., and Taylor, C.D., 1988, Mineralogy and sample locality map of the nonmagnetic, heavy-mineral-concentrate samples, Iditarod quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-32, 37 p., 1 plate, scale 1:250,000. 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.