Unnamed Occurrence (ARDF - ID076; northwest of upper Deadwood Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence consists of a series of thin quartz veins in an iron-oxide-stained, sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The quartz veins are near a N50E-striking mafic dike that cuts the Kuskokwim Group. One grab sample of the quartz veins contained 200 parts per billion (ppb) gold, 1,500 ppb mercury, and 99 parts per million (ppm) arsenic (Bundtzen, Laird, and Lockwood, 1988).
Workings: The Alaska Division of Geological and Geophysical surveys sampled this occurrence in 1983 (Bundtzen, Laird, and Lockwood, 1988).
Commodities (Major) - Au; (Minor) - As, Hg
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).
2 entries listed. 1 valid mineral.
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Bundtzen, T.K., Laird, G.M., and Lockwood, M.S., 1988, Geologic map of the Iditarod C-3 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 96, 13 p., 1 sheet, scale 1:63,360. 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.