Unnamed Occurrence (ARDF - ID066; east of Dishna River), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is a pervasive, silicified zone in an altered dike of intermediate composition that cuts shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Miller, and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). No size or orientation information is available. One sample collected contained 200 parts per billion (ppb) gold and 280 ppb mercury (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) - Hg
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).
1 entry 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.