MONTANA TONOPAH MINE. 



EASTERLY PITCH OF ORE BODIES. 



175 



There appears to be an easterly pitch to the chief ore shoot on the Montana 

 vein, as this has been developed in following down the vein from the 460- to the 

 51'2-foot level. Some of the richest ore in the 460-foot level lies vertically over 

 a relatively poor part of the 512-foot level, the rich ore in the latter level lying- 

 farther east. 



On the Macdonald vein the ore shoots pitch to the east. 



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Scale 

 ao 30 



50 feet 



Fiii. 6S. Vertical cross M^ction (sketched), showing effect of curving and branching faults ou Macdonald vein, in stoi>v 



above the 615-foot level on the Montana Tonopah. 



TONOPAH RHYOLITE-DACITE IN THE MONTANA TONOPAH. 



At a depth of 560 feet the Montana Tonopah shaft passed downward from 

 the ordinarv earlier andesite which contains the veins to a dense rock, which 

 proves to be the glassy Tonopah rhyolite-dacite. 



