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Unnamed Occurrence (ARDF - ID143; east of Little Waldren Fork), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: This occurrence is on an elongate, northwest-trending ridge about 2 miles east of the Little Waldren Fork of the Takotna River. The occurrence is at an elevation of about 1,400 feet. It is about 0.1 mile west of hill 1456 in the SE1/4 SE1/4, section 25, T. 28 N., R. 41 W., Seward Meridian. The location is accurate.
Geology: This occurrence consists of a zone of secondary hematite in a heavily iron-oxide-stained, sericitically altered sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The hematite zone is up to 6 feet thick and is of uncertain length and orientation. A grab sample contained more than 20.00 percent iron, 200 parts per million (ppm) antimony, 100 ppm arsenic, 180 ppm zinc, and 100 ppm nickel (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Alteration: Sericitic alteration of sandstone.

Commodities (Major) - Fe, Sb; (Minor) - As, Ni, Zn
Development Status: None

Mineral List



1 entry listed. 1 valid mineral.

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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., 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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