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Stanley Basin District, Custer Co., Idaho, USA

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.

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

Mineral List

Mineral list contains entries from the region specified including sub-localities
Abernathyite
Arsenopyrite
Autunite
Biotite
Brannerite (TL)
Calcite
Cervantite
Chalcopyrite
'Chlorite Group'
Cinnabar
Coffinite
Dewindtite
Euxenite-(Y)
Fluorite
Galena
'Garnet'
Gold
Graphite
Hematite
Ilmenite
Jarosite
Kaolinite
Limonite
Magnetite
Malachite
Marcasite
Microcline
Molybdenite
'Monazite'
Muscovite
Orthoclase
Phosphuranylite
Powellite
Pyrite
Quartz
var: Chalcedony
Rutile
Scheelite
Silver
Silver
var: Amalgam

Sphalerite
Stibnite
Sylvanite
Tetrahedrite
Titanite
Uraninite
var: Pitchblende
Uranophane
Vesuvianite
Xenotime-(Y)
Zircon


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

Localities in this Region

USA
USA

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