Unnamed Occurrence (ARDF - ID042; southwest of Mount Joaquin), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This stream locally contains gold-bearing gravel (Bundtzen and Laird, 1983; Miller and Bundtzen, 1994, and Miller, Bundtzen, and Gray, 2005). The U.S. Geological Survey found abundant heavy minerals in a panned concentrate taken from the stream at an elevation of about 900 feet (Bennett and others, 1988). The nonmagnetic heavy mineral fraction of the sample contained less than 1 percent visible gold, 1 to 5 percent cinnabar, and 1 to 5 percent scheelite (Bennett and others, 1988). The Mount Joaquin cinnabar-arsenic(-gold) prospect (ID041) is upstream from this site.
Workings: Panned-concentrate samples were collected by the U.S. Geological Survey in 1985 and 1986 (Bennett and others, 1988).
Commodities (Major) - Au; (Minor) - Hg, W
Development Status: None
Deposit Model: Placer Au deposit (Cox and Singer, 1986; model 39a).
3 entries listed. 3 valid minerals.
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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. Bundtzen, T.K., and Laird, G.M., 1983, Geologic map of the Iditarod D-1 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 78, 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.