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
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
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New Locality Added: Sheppard occurrence, Barrie Township, Frontenac Co., Ontario, CanadaFrom Reiner Mielke, 23rd Oct 2014 00:47:15