VALLEY VIEW VEINS UNDERGROUND. 



133 



rock, which microscopic study showed to be probably the Tonopah rhyolite-dacite. 

 This rock is a part of an intruded sheet, which would cut off the vein and termi- 

 nate it below, at least temporarily (tig. 30). 



sw. 



NE. 



'!:' \^:>:^-'l^f':': ^'feK '~-' : ^^T^<: ~i''[- -",-'', '.\'' ' ' ','- <; '.' : : s - 



:;300-ft. level ;/7 





B 



Scale 



100 200 feet 



Fie. 29. CroKsjieotions of the Valley View vein. A, Through the Valley View shaft. B, Cross section of Valley View rein 

 taken a short distance (averaging 200 feet) west of section A. 



THE VALLEY VIEW FAULT. 



Postmineral fractures are abundant in the mine workings, and u notable fault 

 occurs on the 200-foot level, by which the main vein is completely cut off and 

 lost on the east side. This fault has here a strike of N. 15 E. and a dip of 



