MONTANA TONOPAH MINE. 



VEINS OX THK 512-FOOT LEVEL. 



178 



The Montana vein ha.s been followed from the 460-foot level up to the fault and 

 has been traced downward to the 512-foot level. The .situation on this level is shown 

 on PI. XXII. The vein marked on this diagram "Montana vein" has been shown, 

 by tracing the actual connection, to be the same as the vein on the 460-foot level. 

 On the northeast it grows less strong and definite on reaching the main north drift. 



In the east drift a cross wall, striking nearly parallel with the vein, but dipping 



460-ft level^ 

 3ft.above400-ft.Mizpah/ ' 





N 



Tonopah Mining Co- 

 main shaft 



Mizpah 400-ft level 



Scale 

 100 200 



300 feet 



FIG. 82. Horizontal plan showing relations of the Mizpah and Montana veins on the 400-foot level of the M i/pah. 



in the opposite direction (to the south) constitutes the lower limit of this ore shoot. 

 Above this cross wall the ore has been continuously stoped out. Below it the walls 

 continue, and a good deal of quartz is present, but no rich ore has as yet been found 

 below this point on the vein (tig. 63). 



A long north drift from the shaft, on the ol^-foot level, discloses two veins 

 parallel to the Montana. These are shown in PI. XXII. The one nearer the shaft 

 shows in the drift a '2-foot zone of quartz stringers with altered andesite between. 



