Unnamed Occurrence (ARDF - ID126; 84MSL146), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is a zone of quartz-calcite veins in an altered silica-carbonate dike. A prospect pit, now partly sloughed, was sunk on the dike (Bundtzen and others, 1992; Miller, Bundtzen, and Gray, 2005). One grab sample of the altered dike contained 54 parts per million (ppm) antimony, 900 parts per billion mercury, 100 ppm arsenic, and 1,000 ppm chromium (McGimsey and others, 1988). The silica-carbonate alteration and the elevated chromium content suggests that the dike was originally of mafic or ultramafic composition.
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Alteration: Silica-carbonate alteration of dike.
Commodities (Major) - Hg, Sb; (Minor) - As, Cr
Development Status: None
2 entries listed. 2 valid minerals.
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Bundtzen, T.K., Miller, M.L., Laird, G.M., and Bull, K.F., 1992, Geology and mineral resources of Iditarod mining district, Iditarod B-4 and eastern B-5 quadrangles, southwestern Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 97, 46 p., 2 sheets, scale 1:63,360. 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.