LINDGEEN.] IDAHO CITY GOLD BELT. 689 



carries silver only as chloride on top, stephanite and ruby silver in 

 depth the average assays showing values of from 33 to 90 ounces per 

 ton. Ore of the latter kind carries only $1 of gold. Though much of 

 this silver ore is in sight, none has yet been extracted. Four hun- 

 dred and fifty feet beyond the breast of the tunnel another ore body 

 is said to show on the surface and to carry both gold and silver. This 

 is one of the few occurrences of silver veins in the basin, and is of 

 great interest, as the two veins evidently represent separate periods 

 of vein filling, the silver vein probably being the later. 



The Elkhorn mining district adjoins the Gambrinus and is situated 

 on upper Elk Creek. 



The Elkhorn vein is an old location at the junction of Elk Creek 

 and Ross Fork, at an elevation of about 5,300 feet. Discovered in 

 early days, it was worked during 1867 and 1868, and, intermittently, 

 later. Some prospecting was done on it in 1896. It has produced a 

 total of $500,000. The developments consist of a tunnel 1,400 feet 

 long, and stopes above it. It is a well-defined vein, about 18 inches 

 wide, with a northwesterly strike, and carrying decomposed quartz 

 without sulphurets. The ore body was large and the ore high grade, 

 containing up to $40 per ton in gold. The ore shoot was very large, 

 but at a depth of 100 feet it was cut off by a fault plane carrying soft, 

 decomposed granite. There are several other veins in the vicinity, 

 which, however, can show no production. 



The Summit vein is a recent discovery on the ridge between Elk 

 and Grimes creeks, found by tracing the placer gold of Deer Creek 

 up to its source. The vein is inclosed in granite, and strikes a little 

 north of west, dipping 45 SW. There is a zone, 18 feet wide, of 

 crushed granite, carrying 4 feet of pay ore, composed of the same 

 broken granite and quartz seams, and which assays from $10 to $40 

 per ton in gold. The ore shoot is said to be 60 feet long on the sur- 

 face. As usual, the vein carries much water and is difficult ground 

 to timber. Prospecting was in progress in 1896, and it was proposed 

 to sink a shaft 400 feet deep. Between the Summit vein and Center- 

 ville lie, near the road, two quartz claims, called the Golden Fleece 

 and the Golden Star. A 10-stamp mill was built long ago to work 

 the ore, but the results proved unsatisfactory, and the property has 

 long been idle. 



THE QUARTZBURG-GRIMES PASS GOLD BELT. 



The whole lower drainage basin of Granite Creek and Grimes Creek 

 is singularly void of gold-quartz veins. Three miles north of Center- 

 ville, at Crane's claim, a deposit carrying much sulphurets contain- 

 ing gold and silver is being prospected. On Clear Creek, 3 miles 

 south-southwest of Star Ranch, at an elevation of 4,475 feet, are two 

 narrow quartz veins (Jackson's claim), inclosed in granite and carry- 

 ing silver only. A small quantity of rich silver sulphides was found 

 18 GEOL, PT 3 44 



