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Unnamed Occurrence (ARDF - ID160; north of upper Smith Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: This occurrence is on the crest of a low northeast-trending ridge that is northwest of the head of Smith Creek. It is near hill 1170 and about 0.6 mile west-southwest of the center of section 24, T. 24 N., R. 50 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consists of a zone of hydrothermally altered olivine-bearing, basaltic andesite of the Iditarod volcanics (Miller and Bundtzen, 1988; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The alteration which is marked by sericite and carbonate minerals occurs along N35E-striking cleavage planes that dip about 42NW. The size of the zone is uncertain. One grab sample of mineralization contained 240 parts per million (ppm) antimony, 100 ppm copper, and 7.0 ppm molybdenum (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in 1985 (McGimsey and others, 1988).
Alteration: Alteration marked by sericite and carbonate minerals.

Commodities (Major) - Sb; (Minor) - Cu, Mo
Development Status: None

Mineral List



1 entry listed.

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References

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., 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.

Mineral and/or Locality  
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