Unnamed Occurrence (ARDF - ID089; head of Fourth of July Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: The occurrence consists of a swarm of quartz veins in an altered zone of the Iditarod volcanics (Miller and Bundtzen, 1988; Bundtzen, Laird, and Lockwood, 1988; Miller, Bundtzen, and Gray, 2005). One grab sample of mineralization contained 1,400 parts per billion (ppb) gold, 200 ppb silver, and more than 10.0 parts per million (ppm) mercury (McGimsey and others, 1988).
Workings: Surface samples were collected by the the U.S. Geological Survey in the 1980s (McGimsey and others, 1988).
Alteration: Alteration of volcanic rocks to clay.
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. 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., 1988, Right lateral offset solution for the Iditarod-Nixon Fork fault, western Alaska: U.S. Geological Survey Circular 1016, p. 99-103. 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.