ORE DEPOXl i '> 



11 



the system of faulting that prevails in a given district, in order 

 that the ore body may be encountered again with the least 

 possible expenditure of both time and money. (See Fig. 7.) 



FIG. 8. Section across the reefs of the Rand showing the faulting. 

 Hatch and Chalmers.) 



(After 



Schmidt's law is usually followed which is as follows: "If the 

 fault dips or hades away from the workings, the continuation 

 is down the hade. If it dips toward the workings, it should 

 be followed upward" (Fig. 8). 





v 





FIG. 9. Quartz vein along the foot wall of a porphyry dike, with stringers 

 running off into the porphyry. (After Lindgren.) 



Veins. The United States Supreme Court has defined a vein 

 as any belt or zone of mineral rock lying within the boundaries 



