Unnamed Occurrence (ARDF - ID147; on south-flowing tributary of Moose Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: Visible gold was found in a nonmagnetic, heavy mineral concentrate collected in an unnamed creek flowing south from Granite Mountain. The rocks in the vicinity are hornfels derived from the Upper Cretaceous, Kuskokwim Group, and granitic rocks from the Cretaceous Granite Mountain pluton (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (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.