Unnamed Occurrence (ARDF - ID172; upper Little Eldorado Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is based on a grab sample from what was thought to be a barren granite-porphyry plug that cuts sandstone of the Upper Cretaceous, Kuskokwim Group (Miller, Bundtzen, and Gray, 2005). The granite porphyry plug is 71.5 Ma (Miller and Bundtzen, 1994). The grab sample contained 700 parts per million (ppm) arsenic (McGimsey and others, 1988).
Workings: A sample was collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in 1984 (McGimsey and others, 1988).
Age: Unknown; based on a sample from a granite-porphyry plug that has a 40K/40Ar age of 71.5 Ma (Miller and Bundtzen, 1994).
Commodities (Major) - As
Development Status: None
No entries listed.
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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.