THE MINERALS OF IDAHO 173 



BLAINE COUNTY 



Cerargyrite has been found in small grains and films with other 

 silver minerals and cerusite in the ores of the Ella mine, in Ella 

 Canyon in the Era district. In the Wood River districts it was 

 common in the ores near the surface in many small veins and with 

 native silver and sulphides of silver in the Silver Star mine. 



BOISE COUNTY 



In the Idaho City district a vein on the Washington claim parallel 

 to the gold vein carried predominant silver as cerargyrite near the 

 surface and as stephanite and ruby silver in depth. In the Banner 

 district cerargyrite occurred abundantly in the oxidized portions of 

 the rich silver veins. 



CUSTER COUNTY 



Cerargyrite occurs in the Whale mine with free gold, in the Mon- 

 tana mine in films and grams in drusy iron-stained quartz (Cat. No. 

 56526, U.S.N.M.) and in the oxidized portions of the General Custer, 

 Charles Dickens, and possibly other mines. In the Bay Horse dis- 

 trict it occurs in the Beardsley, Pacific, and Silver Bell mines with 

 argentite; in the Red Bird Mine in sand carbonate; and in the River 

 View mine in cerusite and in cellular iron-stained quartz (Cat. 

 No. 56522, U.S.N.M.). 



ELMORE COUNTY 



Cerargyrite is reported to have occurred in some abundance in 

 surface ores of the Monarch and other mines of the Atlanta district. 



IDAHO COUNTY 



Small amounts of cerargyrite have been reported from veins in the 

 Florence and Warren districts. 



LEMHI COUNTY 



Cerargyrite has been mined from the districts in the southeastern 

 portion of the county, where small particles occur in ores formed by 

 the oxidation of argentiferous galena. It occurs also as a secondary 

 product in the Carmen Creek mine and in the Blue Wing district. 63 



OWYHEE COUNTY 



Cerargyrite was probably present in the surface ores of all silver 

 mines of this county. In the Silver City district it was especially 

 abundant in heavily iron-stained quartz in the Hornsilver mine. In 

 the St. Clair mine it occurred with moderately coarse galena in cel- 

 lular iron-stained quartz (Cat. No. 5473, U.S.N.M.) and in the 

 War Eagle it formed films in iron-stained cellular portions of quartz 



« J. B. Umpleby. U. S. Qeol. Survey, Bull. 528, p. 76, 1913. 



