Unnamed Occurrence (ARDF - ID001; south tributary of Dishna River), Innoko District, Yukon-Koyukuk Borough, Alaska, USA
Location: This placer occurrence is at an elevation of about 600 feet in an unnamed, northeast-flowing tributary of the Dishna River. The occurrence is about 0.5 mile south-southeast of the center of section 17, T. 32 N., R. 44 W., of the Seward Meridian. The location is accurate.
Geology: The rocks in the vicinity of this placer occurrence are shale and sandstone of the Upper Cretaceous, Kuskokwim Group near a fault contact with Jurassic ophiolite (Miller and Bundtzen, 1994; Miller, Bundtzen and Gray, 2005). A panned concentrate of alluvial sediments collected at the site contained several grains of gold and 20 to 50 percent cinnabar (Bennett and others, 1988). The lode source of the gold and cinnabar is unknown.
Workings: Surface sampling by the U.S. Geological Survey in 1985 (Bennett and others, 1988).
Age: Probably Quaternary.
Commodities (Major) - Au; (Minor) - Hg
Development Status: None
Deposit Model: Placer Au-cinnabar deposit (Cox and Singer, 1986; model 39a).
ReferencesBennett, 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.
| Cinnabar|| Gold|
2 entries listed. 2 valid minerals.
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Locality Updated: Kalahari manganese field, Northern Cape Province, South AfricaFrom Uwe Kolitsch, 20th Aug 2014 14:35:09