8 CONTENTS. 



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

 The known earlier andesite veins Continued. 

 Mi/pah vein system Continued. 



Geology of the Desert Queen shaft 125 



Intrusive nature of rhyolite contact 125 



Variable attitude of Mount Oddie intrusive contact 126 



Mizpah vein in Desert Queen workings 126 



Formations encountered in the lower workings 127 



The Burro veins 127 



Vein structure 127 



Strength and extent of the Burro veins 129 



Valley View vein system 129 



The Valley View veins on Mizpah Mill 129 



Cross veins and allied phenomena 129 



Vein structure and origin 130 



Ore in the vein 132 



The Valley View vein system underground 132 



Veins in the Valley View workings 132 



The Valley View fault 133 



Veins in the Stone Cabin workings 135 



Veins in the Silver Top workings 136 



The Stone Cabin-Silver Top veins a part of the Valley View vein group... 137 



Correlation of veins in different mines 137 



Effect of the Valley View fault 137 



Hypotheses to explain fault movement 137 



Amount of vertical separation of Valley View fault 138 



Fraction No. 1 vein 140 



Discovery and development 140 



Nature and relations of the Fraction veins 140 



The northeast (Fraction ) fault system 141 



The northwest faults 144 



Cause of faulting 146 



Composition of vein 146 



Fraction No. 2 workings 147 



Rocks exposed in shaft 147 



Faulted vein-fragment 147 



Tonopah rhyolite-dacite 148 



Wandering Boy veins 149 



Relative elevation of fault blocks containing Valley View and Wandering 



Boy veins 149 



Relation of Valley View and Wandering Boy veins 149 



Opposing dips of the veins probably original 150 



Change of dip shown by comparison of the Valley View and the Stone 



Cabin 150 



Wandering Boy and Valley View conjugated veins.. 151 



