THE MINERALS OF IDAHO 89 



ADA COUNTY 



Galena occurs sparingly in quartz with arsenopyrite, pyrite, and 

 sphalerite in gold ores of the Black Hornet and Boise districts. 



BANNOCK COUNTY 



In the Fort Hall district, Fort Hall mine, galena is found in granular 

 mosses with chalcopyrite in a gangue of white calcite. 



BEAR LAKE COUNTY 



In the St. Charles district galena occurs in a number of undeveloped 

 prospects in the Bear River Range near Paris where it has formed, 

 apparently, by replacement of limestone. The mineral appears as 

 pure rounded lumps altered on the outside to cerusite and embedded 

 in siderite and dolomite. 58 



BLAINE COUNTY 



In the Antelope district galena has been mined from the Climax 

 and Silver King claims on Lead Belt Gulch, a tributary to Antelope 

 Creek northeast of Muldoon. 



In the Dome district galena is mined in the Wilbert mine and occurs 

 in a number of prospects. Specimens from the Wilbert mine show 

 a fine grained form of the mineral disseminated in quartzite in minute 

 grains and as seams, and occurring as the cement of a quartzite 

 breccia and laminated with crushed quartzite gouge. Much of the 

 ore consists of quartzite colored dark gray by microscopic grains of 

 galena. In the Johnson prospect the galena occurs in bunches in 

 the country rock along fissures. 59 



In the Elkhorn (Ketchum) district large amounts of galena have 

 been mined from a large number of mines, most important among 

 which are the Elkhorn, Quaker City, Parker, Independence, and 

 North Star. A specimen from the Elkhorn mine shows moderately 

 fine-grained galena with pyrite in white quartz. In a shallow sag 

 near the top of the hill on the Elkhorn claim there occurred a great 

 quantity of placer galena and cerusite which could be shoveled up 

 and jigged. The ore consisted of galena partly altered to cerusite 

 and in the richest part of the upper vein a body 3J^ meters thick 

 was mined. 60 The galena contains from 80 to 148 ounces of silver 

 a ton. The gangue is calcite, quartz, and siderite. In the Inde- 

 pendence mine the galena occurs in relatively large pure masses and 

 is much less contaminated with objectionable sulphides than that in 

 North Star ore, although boulangerite is commonly associated. In 



« s R. W. Richards. Notes on lead and copper deposits in the Bear River Range, Idaho and Utah, U. S. 

 Qeol. Survey Bull. 470, 1911, pp. 177-187. 



»• J. B. Umpleby. U. S. Oeol. Survey Prof. Paper 97, p. 117, 1917. 



M Waldemar Lindgren. Gold and Silver veins in Idaho. U. S. Qeol. Survey. 20th Ann. Rept, pt. 3, 

 p. 210, 1900. 



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