THE MINERALS OF IDAHO 99 



quartz and siderite. In parts of the vein fine-grained galena forms 

 thin sheets in barite. Boulangerite is a constant accessory mineral 

 in the ore. In the Little Giant claim, high on the flanks ol Stevens 

 peak opposite the Gold Hunter, galena occurs as scattered coarse 

 grains and bunches in a vein of barite. 



In the Ninemile Basin the principal mines are the Inters! ate- 

 Callahan, Clarke or Sunset, Success (Granite), Rex (16 to 1), and 

 Tamarack. The last is in the Burke formation but the others are 

 in the blue slaty rocks of the Prichard formation and contain more 

 sphalerite than galena. The Success mine is located on the border 

 of an intrusive mass of monzonitic rock and the galena and sphalerite 

 are intergrown with metamorphic silicates. 



Between Wallace and Kellogg there are several mines opened on 

 veins in the Wallace formation. These are narrow and crooked and 

 are noted for the high silver content of their ore, which consists 

 largely of tetrahedrite with less galena and pyrite and a little specular- 

 ite in a coarse gangue of quartz and buff manganiferous siderite- 

 The Yankee Boy and Polaris mines belong to this group. 



At Wardner the Bunker Hill mine has opened ore bodies of various 

 types, most of them being replacement deposits in quartzite of the 

 Kevett formation. These are largely galena ores in a siderite gangue 

 and are for the most part free from objectionable amounts of sphaler- 

 ite. Some of the ores are high grade, a mass in the Marsh stope 

 showing a diameter of 40 feet of pure galena. The Last Chance 

 mine has mined large amounts of galena ore, as has also the Tyler. 

 The Caledonia, Stewart, Sierra Nevada, Crown Point, Silver King, 

 and Ontario are mines in quartzite west of the Bunker Hill group 

 which are noted as having produced large amounts of galena free 

 from contaminating minerals. In part the ore bodies are flat lying 

 masses of fine-grained galena in much crushed quartzite nearly free 

 from other gangue. A small amount of barite has been found in 

 the Caledonia, Stewart, and Crown Point mines. 



Near Kellogg there are a number of galena-bearing prospects in 

 the Prichard formation, none of which have been commercially pro- 

 ductive. Typical of this group may be mentioned the Lombardy in 

 Italian Gulch north of Kellogg and the Teddy, 3 miles west. The 

 galena in most cases seems to be a later introduction in veins con- 

 sisting of quartz containing large amounts of pyrrhotite, pyrite, and 

 ankerite with some chalcopyrite. The majority of such veins in this 

 group do riot carry galena. 



On Pine Creek a large number of mines have been opened on 

 similar veins in the Prichard formation, most of which carry con- 

 siderable amounts of both galena and sphalerite, with large quantities 

 of iron sulphides. Among these may be mentioned the Highland- 

 Surprise, Hilarity, Douglas, Constitution, Nabob, Sidney, and Little 



