THE MINERALS OF IDAHO 123 



Jumbo mine contain it as the principal sulphide, with pyrite and 

 galena scattered through quartz and ore from the Venture claim 

 shows disseminated patches of chalcopyrite partly altered to copper 

 pitch. Auriferous chalcopyrite distributed through white quartz 

 forms the gold ore of the South Fork mine 7 miles southwest of 

 Elk City and it occurs similarly in many of the mines of the area. 



LATAH COUNTY 



Chalcopyrite is common in the Hoodoo district as disseminated 

 mineralization in a number of prospects and in considerable masses, 

 sometimes 1 meter (3 or 4 feet) wide and 6 meters (20 feet) long, 

 of nearly pure chalcopyrite in the Mizpah mine. It is associated 

 with pyrrhotite and biotite. 5c 



LEMHI COUNTY 



Chalcopyrite is a persistent accessory mineral in Lemhi County 

 occurring in all of the mining districts and nearly all of the mines. 

 In places it is associated with gold but usually it is an inconspicuous 

 companion of pyrite. It occurs in very subordinate amounts in the 

 lead silver deposits. 6 



OWYHEE COUNTY 



In Owyhee County chalcopyrite is common in small grains sparsely 

 disseminated in the ore of the Black Jack, Trade Dollar, Morning 

 Star, Poorman, and other rich silver mines. In the Black Jack 

 mine most of the gold is contained in chalcopyrite. 7 A typical 

 specimen of ore from a raise 1, 300 feet from the portal of the Blaine 

 tunnel, Silver City district contains chalcopyrite with argentite 

 finely disseminated in an aggregate of quartz and adularia. Chal- 

 copyrite occurs also mixed with other sulphides in unoxidized ore of 

 the South Mountain district as in the Bay State mine, where it is 

 intergrown with arsenopyrite, sphalerite, and a little galena. 



SHOSHONE COUNTY 



Iii the Coeur d'Alene district chalcopyrite is widely distributed 

 in the ores being found occasionally in most of the mines. It is the 

 principal ore mineral in copper prospects east of Mullan, where it 

 occurs pure in considerable masses. In the Snowstorm and National 

 mines it forms fine disseminations with chalcocite, etc., in quartzite. 

 Small amounts of the mineral commonly accompany the rich lead- 

 silver ores. It occurrs especially in the Greenhill- Cleveland ore 

 shoot at Mace in Burke Canyon in parallel bands with pyrrhotite 

 constituting the first mineralization of the vein and in pure golden 

 yellow masses with coarse grained galena in streaks which cut the 



»« D. C. Livingston and F. B. Laney. Idaho Bur. Geol. & Mines, Bull., p. 95, 1920. 



•J. B. Umpleby. U. S. Geol. Survey Bull. 528, p. 76, 1913. 



< Waldemar Lindgren. U. S. Geol. Survey, 20th Ann. Kept., pt. 3, 1900. 



