FRACTION NO. 1 VEINS. 



THE NORTHEAST ( FRACTION ) FAULT SYSTEM. 



141 



When the strikes of all the different faults observed in the workings are 

 plotted together, as in tig. 34, they are seen to run in almost every direction 

 without any fairly recognizable sj^stem. Considered as to their relative impor- 

 tance, however, systems are clearly traceable. The most important one is, perhaps, 

 that .striking in a general northeast direction and dipping, as a rule, southeast 

 at varying angles, perhaps approximating 45. By these faults the vein, as seen 

 on a horizontal plan, is moved to the north on the west side. There are many of 

 these, which distribute the faulting between them and constitute a fault zone 



Km. 34. Plotting of tlie strike of the faults In tin? Fraction workings. 



whose limits and total displacement are not known. If this fault zone had a 

 uniform dip it would reach the surface about where the fault line had been 

 independently drawn, from surface phenomena, up the gulch on the southeast side 

 of Brougher Mountain. This fault line, as will be seen, seems to be a direct 

 continuation of that bounding the earlier andesite of Mizpah Hill on the northeast, 

 but the fault movements probably do not correspond in the two localities. 



On the 237- and 300-foot levels of the Fraction this northeast faulting has 

 divided the vein into a series of blocks of very limited extent horizontally, which 

 have l>een dragged apart and separated one from another, and, finally, the vein 

 has t>een lost on account of these faults, both on the east and on the west side. 



