Unnamed Occurrence (ARDF - ID077; southwest of St. Patricks Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is in an iron-stained chert breccia, possibly in a fault sliver of the Innoko Terrane (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The northeast-trending shear zone in the chert contains minor pyrite. No other information is available. One grab sample contained 200 parts per billion (ppb) gold, 200 ppb silver, and 2,500 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).
Alteration: Iron staining.
Commodities (Major) - Au; (Minor) - Ag, 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.