Unnamed Occurrence (ARDF - ID051; northeast of hill 1095), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Location: This occurrence is at an elevation of 600 feet, about 1.4 mile northwest of hill 930 and 1.3 mile northeast of hill 725, about 0.2 mile northeast of the southwest corner of section 27, T. 31 N., R. 48 W., of the Seward Meridian. The location is accurate.
Geology: Upper Cretaceous or Tertiary rhyolitic tuff of the Yetna River volcanic field contains anomalous concentrations of several metals (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Grab samples of rhyolitic tuff contain up to 100 parts per million (ppm) niobium, 50 ppm tin, 15 ppm beryllium, and 150 ppm lead (McGimsey and others, 1988). No ore minerals were recognized.
Workings: Samples were collected 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) - Nb, Sn; (Minor) - Be, Pb
Development Status: None
Deposit Model: May be a tin-granite-type deposit (Miller and Bundtzen, 1994; Bundtzen and Mill
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Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286. 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.