688 IDAHO MINING DISTRICTS. 



done, adjoins the Forest King on the east. The Sub-Rosa, also called 

 the Confederate, is a claim on the same vein, 1,500 feet long, and 

 located on the steep side hill toward Moore Creek. The topography 

 is very rugged, owing to the depth to which the gulches have been 

 incised in the granite. At the line between the Sub-Rosa and the 

 Washington the elevation is 5,500 feet. The vein was worked many 

 years ago by Mr. William Hooten, who extracted a considerable 

 amount of very high grade ore from a comparatively small shoot. 

 Then the mine lay idle for many years, until 1896, when work was 

 resumed with the intention of finding the continuation of the pay 

 shoot from a lower tunnel level. The strike of the vein is N. 56 W., 

 and the dip is, as usual, to the south. The vein is several feet thick, 

 consisting of a very soft clayey mass of altered granite with quartz 

 seams. Many smaller dikes of lamprophyric rocks, chiefly minettes, 

 occur near, the vein. In one of the older tunnels it is clearly seen 

 how one of these dikes is sharply cut off and faulted by the vein. 

 The exposures in the lower tunnel of 1896, 300 feet below the old 

 workings, are interesting. A small portion of the vein was found in 

 about normal position, but on following it toward the west, in the 

 direction of the ore shoot, it was found to be cut off by a dike of 

 minette 20 to 30 feet wide, across which solid granite again was met. 

 At first glance it would appear as if a later dike had cut across the 

 vein and faulted it, but upon close inspection of the dike it is seen 

 to be extremely crushed and separated from the vein by fault planes, 

 and the probability is that the dike was intruded before the vein was 

 formed, and that a subsequent fault has thrown the vein in the hang- 

 ing wall, just as happened in the Cleveland vein. This is made the 

 more probable as extensive explorations had previously failed to find 

 it in the foot wall. 



The Washington claim adjoins the Sub-Rosa on the east. This 

 part of the vein was exploited a few years ago, and a considerable 

 amount of gold was extracted. The mine is equipped with a 10-stamp 

 mill, and is developed by a tunnel following the vein for 290 feet and 

 a vertical shaft sunk to 316 feet at the mouth of the tunnel; three 

 levels are turned from the shaft, and extend, the first to 400, the sec- 

 ond to 250, and the third to 170 feet toward the east. The vein is 

 vertical, and has about the same strike as the Sub-Rosa. An ore 

 shoot 45 feet long and from 1 to 6 feet thick was found, and has been 

 stoped from the 200-foot level up to the surface. The yield is reported 

 to have been $90,000 from 4,300 tons, or $20 per ton. The ore was 

 practically all free-milling and consisted of fresh quartz. A little 

 pyrite occurred in depth. The shoot was cut off in depth by a small 

 vein carrying silver, and its continuation beyond this is not known. 

 Forty feet north of the gold vein, and separated from it by altered 

 granite, is a strong vein of solid quartz, from 8 inches to 4 feet wide, 

 which has been exposed by crosscuts from all levels. This vein 



