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.
ReferencesVan 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
Mineral ListMineral list contains entries from the region specified including sub-localities
53 entries listed. 43 valid minerals. 1 type locality (valid mineral).
Localities in this Region
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