CONTENTS. 9 



CHAPTER V. DESCRIPTIVE GEOLOGY OF MINES AND PROSPECTS Continued. ' Page. 

 The known earlier andesite veins Continued. 

 Valley View vein system Continued. 

 Wandering Boy veins Continued. 



Outcrops of Wandering Boy veins 152 



Representation of outcropping veins underground 152 



Fault systems in the Wandering Boy 152 



Displacement of the Wandering Boy fault 153 



Cross faulting on the 300-foot level 154 



Effects of cross faulting ideally considered 157 



Application of principles to Wandering Boy cross-faults 161 



The vein dip as a factor in the problem 162 



Correlation of veins in Fraction and in Wandering Boy 162 



Faults not corresponding to the main systems 163 



Relative age of Fraction and Wandering Boy faults 163 



Ore in Wandering Boy veins 163 



Veins of Gold Hill .' 164 



Gold Hill a fault block 164 



Nature of Gold Hill andesite 164 



Alteration of Gold Hill andesite 165 



Enumeration of Gold Hill veins 165 



Production of Good Enough vein 166 



Vein structure 166 



Gold Hill shaft 166 



Tonopah and California workings 167 



Section exposed in workings 167 



California fault 167 



Veins .- 167 



Montana Tonopah vein system 167 



Montana Tonopah mine 167 



Absence of veins in the later andesite 167 



Vein on the 392-fcot level 167 



Branch vein on the 460-foot level 169 



Connection of branch vein with Montana vein 170 



Brecciated structure in the Montana vein 170 



Crustification in the Montana vein 171 



Conditions of formation of Montana vein 172 



Faults on the 460-foot level 1 72 



Veins on the 512-foot level 173 



Easterly pitch of ore bodies 1 75 



Tonopah rhyolite-dacite in the Montana Tonopah 175 



North Star workings 177 



Section passed through 177 



Veins '. 1 78 



Faulting 178 



