VEINS AT CONTACT OF ODDIE BHYOLITE. 



191 



tite, ruby silver, polybasite, or stephanite. This occurrence of bunches of -high- 

 grade ore, probably belonging to veins of the later rhyolite-dai-ite period, is 

 similar, to that of ore in veins of the same period in the Desert Queen. 



At the 500-foot level, which is at the bottom of the shaft, the formation is 

 all rhyolite-dacite. It has been explored for a short distance north, south, and 

 west by drifts. No bodies of quartz of any importance were found, although a 

 drift along a northeast fault plane shows a breccia partly cemented by jasperv 

 quartz. 



SE .,_.., . . NW 



Tonopah Extension shaft 



MacNamara shaft 



Fin. 71. Vertical section through Mm-Samarn and Tonopah Extension shrfts. 



EXPLORATIONS ON VEINS AT THE CONTACT OF THE ODDIE 



RIIYOL.ITE. 



WINGFIELD TUNNEL. 



The Wingtield tunnel is situated on the southwest slope of Ararat Mountain. 

 It starts in later andesite near the contact of this rock with the Oddie rhyolite, 

 which forms the summit of the mountain, and passes from the later andesite 



