132 GEOLOGY OF TONOPAH MINING DISTRICT, NEVADA. 



ORE IX TIIK VKIX. 



As a rule the Valley View vein system contains a larger volume of vein 

 material than the Mizpah system, but a smaller amount of the precious metals. 

 Therefore the Mizpah has produced more ore than the larger vein. Considerable 

 ore of the kind locally considered low grade (up to $50 per ton, for example) has 

 been found in the Valley View veins, and some other portions have been found 

 to be very rich: this rich ore lies in masses, without, so far as yet developed, any 

 regular extension. 



THE VAI-LEY VIEW VEIN SYSTEM UNDERGROUND. 



Underground on the Valley View vein system are the workings from the main 

 Valley View shaft, those from the near-by Silver Top shaft (both of these shafts 

 belong to the Tonopah Mining Company), and those of the Stone Cabin shaft, 

 and, as before stated, outside of Mizpah Hill, probably the Wandering Boy and 

 Fraction workings. 



VK1XS IN THE VALLKY VIEW WORKINGS. 



Of these underground workings those of the Valley View are the most 

 extensive. There were levels at depths of 200, 300, 400, and 500 feet at the time 

 of the writer's last visit. Instead of the several parallel strong veins outcropping 

 at the surface, these workings show a single main vein, which is thicker than 

 any at the surface. Furthermore, while the surface veins are nearly perpen- 

 dicular, the underground vein has a dip to the north of less than 45. This 

 vein is tj or 8 feet or more thick in various places. 



Other veins disclosed in the workings are weak and nonpersistent, though 

 locally they may be a few feet thick and may hold out promising indications. 

 Frequent quartz stringers, which may be so numerous in places as to form nearly 

 a network, occur; and plainly, from what is known of the general geology, these 

 scattered threads might at any point unite vertically or laterally and form a 

 decided vein, and thus account for the veins which outcrop and are not cut in 

 underground workings, or those encountered in one mine level and not in the 

 expected place in another. Many of these stringers are vertical, so that they 

 would merge with the flatter-lying main vein in a short distance. The general 

 situation would seem to be represented in rig. 2!. A strong east-west striking 

 and north-dipping vein (associated with parallel and crosscutting minor veins and 

 stringers, many of them nearly vertical) has given its strength near the present 

 surface to a number of vertical transverse fractures, so that the main vein splits 

 into a number of vertical ones. 



On the oOo-foot level the vein is still strong. The crosscut on the 700-foot 

 level, however, did not encounter it, but passed through a body of white, dense 



