THE MINERALS OF IDAHO 95 



In the Sheep Mountain district galena is found in several mines. 

 In the Golconda claim a quartz vein in limestone contains it associ- 

 ated with pyrite, sphalerite, and pyrrhotite. The King property 

 produced considerable amounts of lead silver ore consisting of galena 

 containing up to 170 ounces silver a ton, together with pyrite, 

 sphalerite, and a little chalcopyrite in a quartz gangue in limestone. 

 Galena occurs also in the Bulldog, Lakeview, Silver Bell, and other 

 prospects in this district. 66 



ELMORE COUNTY 



In the Atlanta district highly argentiferous coarse-grained galena 

 is a common constituent of the rich silver ores of the Atlanta lode 

 (Cat. No. 30199, U.S.N.M.) where it is associated with stephanite 

 and pyrargyrite. 



In the Neal district galena is an accessory mineral together with 

 pyrite and sphalerite in the gold ores. The galena constitutes less 

 than 1 per cent of the ore and assays as high as 167 ounces silver and 

 7 ounces gold a ton. In general, however, gold is more intimately 

 associated with pyrite and silver with galena. 



In the Rocky Bar district galena is a mineral of minor importance 

 in the primary ores of the sulphidic gold quartz veins. 



FREMONT COUNTY 



In the Skull Canyon (Kaufman) district galena occurs in the 

 Kaufman and Weaver claims with the oxidation products cerusite 

 and a little plumbojarosite cementing a brecciated shaly limestone. 

 In the Weimer copper mine galena forms kidney-shaped masses in 

 the copper ore with cerusite and wulfenite. 



In the Birch Creek district there is galena in the Birch Creek 

 mine, associated with anglesite, cerusite, wulfenite, and smithsonite. 

 The galena occurs both as the fine grained steel variety and as cubes. 

 Some cubic crystals up to 2 cm. in diameter are isolated in yellow 

 jasper. Nodules of galena are surrounded by concentric zones of 

 oxidation products. 



IDAHO COUNTY 



In the Big Creek district some galena ore occurs with pyrite in a 

 crushed zone in limestone along a rhyolite dike. 



In the Dixie district galena is occasional as an accessory sulphide 

 in gold quartz ores. A specimen of ore from the Mallard Creek 

 prospect shows granular galena, altering to pyromorphite, admixed 

 with light yellow sphalerite in quartz. The gold in these veins is 

 usually rather ultimately associated with the galena. 



In the Elk City district galena is of rather common occurrence with 

 pyrite as scattered bright grains in white quartz, as in specimens 



86 J. B. Umpleby and D. C. Livingston. A Reconnaissance in South Central Idaho. Idaho State Bur. 

 Mines and Qeol. Bull. 3, p. 17-21, 1920. 



