152 GEOLOGY OF TONOPAH MINING DISTRICT, NEVADA. 



south-dipping flat veins, represented, respectively, in the Valley View and in 

 the Wandering Boy, are then probably not parts of the same vein, but represent 

 a pair of veins dipping at equal angles in opposite directions (fig. 41). 



OUTCROPS OF WANDERING BOY VEINS. 



The outcrop veins northeast of the Wandering Boy all have a northeast strike 

 and a southeast dip. As observed at the surface they are designated as 1, 2, 3, 

 and 4 on fig. 42. 



REPRESENTATION OF OUTCROPPING VEINS UNDERGROUND. 



The heaviest vein, No. 1, as there is reason to believe, may be the main 

 vein of the underground workings shown in the 300-foot level. The 8-inch vein 

 represented on the 300-foot level, northwest of the probable position of the main 

 vein at this point, may very well be the same as No. 2. The 6-inch vein followed 

 on the 115-foot level may perhaps also be No. 2, in spite of the fact that though 

 it has a southeast dip it lies almost directly over the supposed No. 2 vein on the 

 300-foot level. The general result of the faulting here has been to place the veins 

 in the lower levels in a position farther north, on the west side of the numerous 

 faults, than would be the case if the veins continued regularly downward. The 

 inclined shaft shown in the figure was inaccessible at the time of the writer's 

 visit, but drifts were run on two veins at distances of 65 and 95 feet from the 

 surface. It is likely, as shown in the figure, that the former was on the No. 3 

 vein." the latter on the No. 4. 



FAULT SYSTEMS IN THE WANDERING BOY. 



In the Wandering Boy workings the veins are thrown into great confusion 

 by faulting. Analysis of the disturbance leads to the conclusion that the faulting 

 can be referred to two major systems that of the Wandering Boy fault, which 

 strikes northwest and outcrops just east of the Wandering Boy shaft, and that 

 of the Fraction fault, which strikes northeast and whose outcrop is drawn on 

 the map as lying between the Fraction No. 1 and the Fraction No. 2 shafts. 

 In the Wandering Boy workings the Wandering Boy fault dips southwest at an 

 angle of approximately 50, while in the Fraction workings the Fraction fault 

 dips southeast at an angle of about 45. In the north corner of the block inclosed 

 by these two faults, therefore, the line of intersection of the faults pitches south, 

 and the faults rapidly approach as they go deeper. The estimated position of 

 these two faults on the 300-foot level is shown in PI. XXI, and may be compared 

 with the surface outcrops, as shown on the map (PI. XVI). 



a Mr. J. M. Healy inform* the writer that the vein shown in the figure, as drifted on at the 66-foot level, was 3 feet 

 thick and of low grade. 



