72 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



BOISE COUNTY 



Silver in native form occurred rather abundantly in the richer 

 silver ores of the Poorman mine, Banner district, where it was associ- 

 ated with pyrargyrite, cerargyrite, polybasite, argentiferous galena, 

 and gold. 



BONNER COUNTY 



Native silver occurs in small amount in the oxidized portions of 

 the Weber and other veins near Lakeview on Lake Pend Oreille. 



CUSTER COUNTY 



Native silver occurs sparingly in Custer County as twisted wire- 

 like filaments in cavities in the late Tertiary oxidized ores. In the 

 Yankee Fork district wire silver, together with argentite and cerargy- 

 rite, is mixed with manganese oxides. In the Charles Dickens mine 

 it occurs with gold. In the Golden Sunbeam mine where electrum 

 is present in the primary ore, native silver occurs with pure gold 

 in the oxidized zones. 18 In the Bayhorse district silver is found in 

 leaf and wire forms in the Skylark and River View mines. 



ELMORE COUNTY 



In Elmore County silver occurred formerly in rich ores of the 

 Atlanta district. Lessees on the Old Monarch ground on the At- 

 lanta lode encountered a 6 centimeter streak of rusty quartz con- 

 taining abundant native silver at the surface, with a streak of similar 

 width containing ruby silver. 



IDAHO COUNTY 



In Idaho County native silver has been found in the Little Giant 

 vein, Warren district, with tellurides, argentite, and bromides of 

 silver. 19 



LEMHI COUNTY 



Although rare, native silver has been found in the Texas district 

 and also in the Gold Flint property in the Mackinaw district. 



OWYHEE COUNTY 



Native silver occurred rather sparingly in the Trade Dollar, Poor- 

 man, and other mines of the Silver City district. 



SHOSHONE COUNTY 



Native silver constantly accompanies cerusite and other secondary 

 minerals in the oxidized portions of the silver-lead veins. It com- 

 monly appears in dendritic moss-like aggregates of distorted crystals 

 strung into wires or forming spongy masses. 



is J. B. Umpleby, U. S. Geol. Survey Bull. 539, p. 53, 1913. 



i» Waldemar Lindgren, U. S. Geol. Survey, 20th Ann. Rept., pt. 3, p. 248, 1900. 



