Unnamed Occurrence (ARDF - ID052; west of VABM Idono), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Location: This occurrence is about 4,000 feet west-northwest of VABM Idono at an elevation of about 650 feet. It is in the northern part of section 3, T. 29 N., R. 48 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is a potassically altered outcrop of rhyolite of the Upper Cretaceous to early Tertiary, Yetna River volcanic field (Miller and Bundtzen, 1994). A grab sample of the rhyolite contained 130 parts per million (ppm) arsenic, 50 parts per billion (ppb) gold, 1,400 ppb mercury, and 20 ppm tin (McGimsey and others, 1988; Miller, Bundtzen, and Gray, 2005).
Workings: The U.S. Geological Survey sampled the occurrence in 1984 (McGimsey and others, 1988).
Age: Unknown; the Yetna River volcanic field is Late Cretaceous to Tertiary (58-68 Ma) in age (Miller and Bundtzen (1994).
Alteration: Potassic alteration.
Commodities (Major) - Au; (Minor) - As, Hg, Sn
Development Status: None
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McGimsey, R.G., Miller, M.L., and Arbogast, B.F., 1988, Paper version of analytical results, and sample locality map for rock samples from the Iditarod quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-421-A, 110 p., 1 sheet, 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.