THE MINERALS OF IDAHO 159 



minute crystals embedded in the gangue material and intergrown 

 with the pyrite. and also as narrow veinlets cutting across the sul- 

 phide ore. 38 



BOISE COUNTY 



Ruby silver, probably proustite, has been reported as a rarity in 

 ores of the Shamrock and Lincoln mines in the Pearl district. 39 



LEMHI COUNTY 



Proustite occurs as small red crusts on ores from the Carmen Creek 

 district, and is reported as occurring in ores of the Texas and Spring 

 Mountain districts. 40 



OWYHEE COUNTY 



In Owyhee County proustite has been found rather frequently in 

 most mines. In the Henrietta mine it occurred but was not abundant, 

 being replaced in the ores by miargyrite and pyrostilpnite. In the 

 Poorman mine a remarkable occurrence of proustite is reported to 

 have occurred about 100 feet below the surface. The mineral formed 

 a solid mass weighing over 500 pounds, and it is stated that its surface 

 showed roughly the planes and angles of a crystal. Upon being 

 fractured it showed through the mass a uniform crystalline structure. 

 A portion of this mass was sent to the Paris Exposition of 1867, 

 where it was awarded a gold medal. 41 Lindgren states that if this 

 is correct, and the testimony appears to be reliable, this constitutes 

 one of the most remarkable occurrences of this mineral known. 42 

 D'Aligny 43 describes the material exhibited by Wells D. Walbridge, 

 of Ruby City, as silver ores from the Poorman lode (No. 306), con- 

 sisting of four large specimens of native silver, ruby silver, chloride 

 and sulphuret of silver, valued at $5,000. 



SHOSHONE COUNTY 



In the Coeur d'Alene district proustite occurs in the Yankee Boy 

 mine, and is reported from the Polaris and Big Creek mines on Big 

 Creek near Kellogg. The ores of these mines consist mainly of highly 

 argentiferous tetrahedrite with less galena and pyrite in a gangue of 

 quartz and siderite. The proustite is rare in the vein proper, but 

 occurs in thin films and as flattened and distorted crystals in joints 

 in the slaty wall rocks adjacent to the veins. 



as J. B. Umpleby, U. S. Qeol. Survey, Prof. Paper 97, p. 123, 1917. 



»» Waldemar Lindgren. U. S. Qeol. Survey, 18th Ann. Rept., pt. 3, p. 713, 1897. 



« J. B. Umpleby. U. S. Geol. Survey, Bull. 528, p. 78, 1913. 



u J . Boss Browne. Mineral Resources of the United States for 1868, p. 523. 



42 Waldemar Lindgren. U. S. Geol. Survey, 20th Ann. Rept., pt. 3, p. 153, 1900. 



43 Henry F. Q. D'Aligny. Catalogue of minerals of the United States of America exhibited at the Paris 

 Exposition. Paris, 1807, p. 12. 



