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.

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 Idaho Custer Co. Stanley Basin District Abbie Lou Prospects (Abbielou) Alta Prospects Aspen No. 4 Prospects Aspen Prospect B and R Prospect Baker and Potato Hill Mine Bell Cross Prospects (Bell-Cross-Enterprise-Claims) Big Casino Creek Placer Big Casino Prospect Big Hank Prospect (Little Spring; Side Hill; Pine Hen) Black Cube Prospect Blind Ledge North Prospect Blind Ledge Prospect Buckley Bar Placer Chinese Workings Coal Creek Mine Coal Creek Mine (No. 1; No. 10 Claims; No. 4) Copper Creek Bright Star Mine (Brindle Pup Group) Deer Strike and Elk Mine Doran Gulch Placer East Basin Mine East Storlie Prospect Elk Creek Placer Elk Creek Prospect (Shirley Ann; Dukes Mixture Nos. 1; 2; 3) Elkhorn Claims Enterprise Prospects Flying Dutchmans Nos. 1 & 2 Fool Proof Claims Four Aces Placer (Four Acre Placer) Fritz Prospect Gold Chance Mine Gold Coin Prospect Golden Anchor Nos. 1; 2; & 3 Golden Day Mine (Golden Ray Mine) Grand Prize Prospect Grubstake Occurrence H and M Prospects (Genesis) Ham Fat Placer Hardee Mine Hide Out Prospect (Lynch Creek) Horseshoe Claims (Bright Star 6; 10; 15) Joe's Gulch Iron Crown Mine Joes Gulch Placer (Lucky Strike; Hot Stuff; Hershey) Kelley Creek Placer Kelly & Joe Prospect (T. P. Lode) Klondyke Prospect Lightning (Copperite) Lightning No. 1 Mine Lightning No. 2 Mine Lightning No. 3 Prospect Lightning Upper Pit Mine Little Casino Creek Placer Little Joe Prospect Little Pete Occurrence

USA Idaho Custer Co. Stanley Basin District Lone Star Lower Harden Prospect Lucky Strike Prospects (2) Lynch Creek Fluorspar Occurrence Lynch Prospect (Potato Mtn Mine; Day) Main Diggings Prospects Mamouth No. 1 Prospect Mamouth No. 2 Prospect Mandate Prospect McClure No. 2 Occurrence (Copper Creek Occurrence) Meadow Creek Placer Mormon Bend Placer Mountain Vein Prospect Mountain View Group Nip and Tuck Creek Placer P and B Prospects (Rocket 1-5 & Saturn) Poorman Prospect Prospect (MRDS - 10119628) Prospect (MRDS - 10168091) Prospect (MRDS - 10192773) Prospect (MRDS - 10240906) Rocket Nos. 1 and 2 Occurrence Rough Creek Placer Sawtooth National Recreation Area Fran Clara Prospect Rodman Prospect Sawtooth Primitive Area Alpine Lake Area Prospect Greenback Prospects Shamrock Prospect Shorty Group (Lazy Jack; Sunday) Silver Dollar Mine (Second Chance) South Potato Mountain Prospects Stanley Giant Spar Mine Harden Creek Hay Creek Homestake Mine (Last Chance) Kelley Gulch Stanley Ace Prospects Stanley Basin Stanley Lake Creek Outcrop Occurrence Trail Prospect Unnamed Antimony Prospect (MRDS - 10265486) Unnamed Tungsten Prospect (MRDS - 10289948) Upper Noho Creek Prospect Upper Ten Prospect Uranus Prospects Valley Creek Placer Vaught Prospect (Gold Coin) WAJ 151-154 Prospect Weidman Workings (Sturkey Placer; Starkey Placer) White Star No. 1 Prospect Willow Flats Placer (Willis Group; Willow Group) Wonder 19 Extended Occurrence Wormak's Dredge Placer