Unnamed Occurrence (ARDF - ID002; west of Dishna River), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is an extensively altered, mafic or intermediate dike with conspicuous iron oxide staining. It is part of a large northeast-trending dike swarm that cuts the shale and sandstone of the Cretaceous Kuskokwim Group just east of VABM Cabin (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). One grab sample of altered dike rock contained 2.4 parts per million (ppm) mercury, 14 ppm antimony, and 10 ppm arsenic (McGimsey and others, 1988).
Workings: Surface sampling was conducted by the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Age: Unknown; possibly Late Cretaceous, based on ages of similar dikes in Iditarod quadrangle (Miller and Bundtzen, 1994).
Alteration: Silica-carbonate alteration of dike rock.
Commodities (Major) - Hg; (Minor) - As, Sb
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.