LINDGEEN.] IDAHO CITY GOLD BELT 685 



the rich placers led up to the vein. The production is stated to be 

 $225,000, which has been chiefly taken out in small batches of very 

 rich ore. Some ore from this claim was crushed in 1895 in the Elaine 

 mill. The deposit is characteristic of many veins in the Idaho Basin. 

 Large masses of quartz are hardly ever seen. The strike is N. 71 W. 

 and the dip 40 S. The vein consists of a wide zone of sheeted and 

 fractured granite, with abundant small quartz seams between the 

 joints of the sheets or ramifying through them. These small quartz 

 seams carry the gold, while the granite between them, though usually 

 altered, soft, and decomposed, contains no pay. This sheeted zone 

 is here 30 to 40 feet wide and contains gold throughout. The princi- 

 pal pay shoot is, however, 400 feet long, and one streak, 2 feet wide, 

 in this pay shoot is particularly rich. The deposit has been sluiced 

 off on the surface and then worked by means of a crosscut tunnel 

 from the gulch. A cross seam, also carrying some gold, joins it in 

 Illinois Gulch, and a parallel vein is also said to exist. The ore is 

 practically all free milling on the surface. Even when sulphurets 

 are met with in depth it is probable that a larger proportion of the 

 gold will remain in free condition. The developments may be said to 

 be very slight and unsatisfactory, but it is probable that if properly 

 opened the vein would furnish great amounts of low-grade ore, which, 

 with suitable and cheap methods of extraction and reduction, might 

 be made to pay. The width of the vein and the soft character of the 

 rock would make mining somewhat expensive and difficult. 



The Chicago claim, on which but a slight amount of development 

 work has been done, adjoins on the west, beginning near the road on 

 the summit of the ridge. 



The Populist vein. This vein is situated 1 mile west-northwest of 

 the Illinois. It has a similar strike and dip, and some work has been 

 done on it recently. 



The Cleveland vein. This relatively small vein is locHted 5 miles 

 north-northwest of Idaho City, on the south side of Forest ,King Gulch, 

 at an elevation of 5,030 feet. It is a single-fissure vein, about 1 to 2 

 feet wide, inclosed in granite, striking a little north of west and dip- 

 ping 60 S. A rich shoot 100 feet long was found on it a few years 

 ago, which yielded a considerable sum of money; it has not been 

 followed below the present tunnel level. The mine is of interest as 

 showing plainly the result of faulting, illustrated in fig. 62. The vein 

 is thrown a distance of GO feet horizontally in the hanging wall. At 

 least two faults of this character are known. If movements in only 

 a vertical direction have taken place, this fault is certainly an over- 

 thrust, the hanging wall having moved up relatively. As, however, 

 lateral movements may also have occurred, it is possible that the 

 present position of the vein may be due to an oblique movement to 

 the southwest, the direction of which makes with the horizontal an 

 angle of between and 60, the hanging wall having moved down 



