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Unnamed Occurrence (ARDF - ID042; southwest of Mount Joaquin), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: This placer occurrence is near the head of a stream that flows southeast from Mount Joaquin. The stream was sampled at an elevation of about 900 feet, about 0.5 mile north of the center of section 27, T. 32 N., R. 37W., of the Seward Meridian. The location is accurate.
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).

Mineral List



3 entries listed. 3 valid minerals.

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References

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.

Mineral and/or Locality  
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