THE MINERALS OF IDAHO 85 



BOISE COUNTY 



In this county argentite has been one of the chief ore minerals 

 mined in the rich silver-bearing quartz veins in granite in the Banner 

 district where it is associated with stephanite, pyrargyrite, and native 

 silver with some pyrite and sphalerite. The ore is exceedingly rich in 

 streaks. In the Quartzburg district argentite was associated with stains 

 of copper carbonate and iron arsenates as a small amount of rich silver 

 ore mined from two narrow veins on Clear Creek three miles south- 

 west of the vStar ranch. Specimens from the old Washington mine, 

 Idaho City district show small sectile masses of argentite associated 

 with stephanite in quartz. 



BLAINE COUNTY 



Argentite is present in small grains with proustite, cerargyrite, 

 tetrahedrite, smithsonite, and cerusite in the ores of the Ella mine 

 near the head of Ella Canyon in the Era district and also in the 

 Silver King and Vienna mines. A specimen from the old Neptune 

 mine (Cat. No. 56536, U.S.N.M.) shows mossy black grains of argen- 

 tite associated with leafy native silver in altered granite. 



CUSTER COUNTY 



In Custer county silver glance is rather abundant in the rich 

 oxidized ores of the Late Tertiary veins. 53 In the Bay Horse district 

 it occurs in small amount with leafy and wire silver, cerargyrite? 

 pyrargyrite, carbonates of copper, and native copper in the oxidized 

 ore of the Skylark mine; and also with the same minerals in much of 

 the ore of the Riverview mine. In the Yankee Fork district the sul- 

 phide forms small grains in the oxidized ore of the General Custer 

 mine with wire silver, cerargyrite, manganese oxides, and malachite. 

 (Cat. No. 56527, U.S.N.M.) ' 



ELMORE COUNTY 



In the rich ores of the Atlanta lode, Atlanta district, argentite 

 occurred in the form of mossy grains (Cat. No. 51864, U.S.N.M.) 

 but was greatly subordinate to stephanite and pyrargyrite in most of 

 the ore. 54 



IDAHO COUNTY 



Argentite has been reported as a constituent of rich ore from the 

 Little Giant vein, Warren district, associated with tellurides, native 

 silver and gold. 55 



83 J. B. Umpleby. Some ore deposits of northwestern Custer County, Idaho. Bull. U. S. Oeol. Survey 

 539, p. 52, 1913. 

 H Joshua E. Clayton. Trans. Amer. Inst. Min. Eng., vol. 5, p. 471, 187C. 

 » s Waldemar Lindgren. U. S. Oeol. Survey, 20th Ann. Rept., pt. 3, p. 246, 1899. 



