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Stanley Basin District, Custer Co., Idaho, USA

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The Stanley uranium district in central Idaho produced a modest amount of uranium ore from 1957 to 1962. The district consisted of at least 27 uranium mines and prospect claim groups across a 10-mi2 area, located a few miles northeast of the town of Stanley. The average grade (about 0.18 percent U3O8) of the uranium deposits mined in the district was comparable to other U.S. producers, but its output (no more than 8,000 tons of uranium ore per year) and its mines were relatively small.
In the district, the uranium deposits occur in two geologic settings: (1) as disseminated uranium minerals within fluvial-channel arkosic sandstones and conglomerates that rest upon the eroded surface of the Cretaceous Idaho batholith and below the Eocene Challis Volcanic Group and (2) as pockets of uranium minerals in silicified fractures that cut through the granitoid batholithic rocks. The largest uranium deposits—which had the largest mines of the district, all open-pit operations—are the strata-bound, sedimentary rock–hosted type.

Mineral List

Mineral list contains entries from the region specified including sub-localities


53 entries listed. 43 valid minerals. 1 type locality (valid mineral).

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References

Van Gosen, Bradley S.; Hammarstrom, Jane M.; Eppinger, Robert G.; Briggs, Paul H.; Crock, James G.; Meier, Allen L.; Sutley, Stephen J.; Theodorakos, Peter M.; Hageman, Philip L. (2006) A reconnaissance geochemical and mineralogical study of the Stanley uranium district, Custer County, central Idaho. USGS Scientific Investigations Report 2005-5264

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