Unnamed Occurrence (ARDF - ID050; on hill 935), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is in vuggy silicified rhyolite of the Upper Cretaceous to Early Tertiary, Yetna River volcanic field (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). A grab sample of iron-stained rhyolite contained 10.0 parts per million (ppm) silver, 500 ppm lead, and 20 ppm tin (McGimsey and others, 1988).
Workings: Surface sampling was conducted by the U.S. Geological Survey 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).
Commodities (Major) - Ag, Pb; (Minor) - Sn
Development Status: None
Deposit Model: May be a tin-granite-type deposit (Miller and Bundtzen, 1994; Bundtzen and Mill
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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.