436 " BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



ish from copper stain, associated with azurite and including residual 

 tetrahedrite occurs in specimens from the Skylark mine. 



OWYHEE COUNTY 



Bindheimite has been noted in ore from the South Mountain 

 district as an ocherous yellow powder in cavities of coarse galena 

 with anglesite and linarite in the Monkey mine, with cerusite and 

 anglesite coating coarse cleavable galena from the Rocksyfellow 

 mine and sparingly as ocherous yellow stains with cerusite and 

 minium on ore from the Golconda mine. 



A rich silver ore from near the surface in the Castle Creek mine 

 near the Dunham Ranch 18 miles from Oreana, consists of cavernous 

 quartz containing pulverulent dull yellow material called "chlorides." 

 This is completely soluble in hot concentrated hydrochloric acid and 

 gives reactions for abundant antimony and lead, hence is doubtless 

 bindheimite. 



SHOSHONE COUNTY 



In the Coeur d' Alene district bindheimite probably occurred in 

 the oxidized portions of all of those mines which contain primary 

 antimonial minerals. The oxidized ores of this district consisted for 

 the most part of cerusite and limonite with smaller amounts of angle- 

 site, pyromorphite, plattnerite, and native silver, A common 

 constituent of the oxidized ores of all the larger mines of the region 

 was a soft ocherous material of a canary yellow color which, except 

 in its brighter tone of color, looked very much like the ocherous 

 limonite which was abundant in the ores. The miners recognized 

 this mineral and commonly referred to it as "chlorides" and regarded 

 it as indicating rich silver values in the oxidized ore. Such soft 

 yellow material was recognized by Ransome, 37 who thought it to be 

 massicot and the present writer, even after having made blowpipe 

 tests for antimony, called the material massicot and stated that 

 bindheimite did not occur. 38 Later more thorough examination 

 established the presence of abundant antimony in these materials. 

 Hundreds of tons of ore in which bindheimite was a prominent con- 

 stituent have been mined in the district. 



In the Hercules mine the ocherous yellow lead antimonate was 

 common in all of the richer ore associated with large masses of 

 crystalline cerusite. It was also prominent in the surface ores of 

 the Poorman mine at Burke and was conspicuous practically to the 

 surface in some of the upper workings of this mine. In the upper 

 workings of the Mammoth mine at Mace small cores of unoxidized 

 tetrahedrite were surrounded by concentric rings of yellow and 

 greenish-yellow bindheimite. 



« F. L. Ransome, and F. C. Calkins. U. S. Geol. Survey, Prof. Paper 62, p. 94, 1908. 

 !s E. V. Shannon. Secondary enrichment in the Caledonia mine, Coeur d' Alene dist., Idaho Econ. 

 Geology, vol. 8, p. 565, 1913. 



