Unnamed Occurrence (ARDF - ID143; east of Little Waldren Fork), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence consists of a zone of secondary hematite in a heavily iron-oxide-stained, sericitically altered sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The hematite zone is up to 6 feet thick and is of uncertain length and orientation. A grab sample contained more than 20.00 percent iron, 200 parts per million (ppm) antimony, 100 ppm arsenic, 180 ppm zinc, and 100 ppm nickel (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Alteration: Sericitic alteration of sandstone.
Commodities (Major) - Fe, Sb; (Minor) - As, Ni, Zn
Development Status: None
1 entry listed. 1 valid mineral.
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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.