356 MINING INDUSTEY. 



tion. In such, case the portion of the vein continuing in depth is almost 

 always to be sought by driving a cross-cut to the northeast, at right angles to 

 the course of the vein, in accordance with the general rule that the surface 

 rock or ground inclosing the upper part of the vein has slipped downward, 

 leaving the deeper part in the standing ground above. This is illustrated in 

 Fig. 1, Plate XXVII. ABCD represents the section of a vein that has been 

 faulted, or broken, the ground inclosing the portion nearest the surface having 

 slipped downward on the line, a a', removing that part of the vein, A B, from 

 its original position, indicated by dotted lines, to a point below, as shown in 

 the drawing. A shaft, or incline, sunk from the surface on the part of the 

 vein, A B, would encounter the country-rock at B, and a cross-cut driven 

 thence in the country-rock, at right-angles to the course of the vein, would 

 strike the continuation of the same at E. 



The complication that may easily arise in such cases, giving frequent 

 occasion for litigation, may be readily comprehended by supposing that the 

 movement of the two disconnected parts of the vein A B CD has been so 

 great that another similar vein occurs between the points B and E, as shown 

 in Fig. 2. In this case, the surface of the ground inclosing the vein ABCD 

 and the vein F has been moved downward, on the line a a', so far that the 

 continuation of the vein F is in the ground between A B and CD. A cross- 

 cut, therefore, from B would first meet with the vein F. Should the latter 

 present features similar to those of the vein ABCD, there might be diffi- 

 culty in recognizing it as a different vein, thus giving occasion for a dispute 

 between the owners or claimants of the vein A B CD and the owners of the 

 vein F. 



TiMOKE Mine. — This is the southeasternmost of the three mines that have 

 been successfully worked on the North Star vein. Though having but a 

 short extent of developed ground it has been one of the most profitable mines 

 in the district, considering the amount of capital originally invested. It is 

 opened by means of an incline, 80 feet from the northwest boundary line that 

 separates the property from the claim of the Manhattan. The incline follows 

 generally the dip of the ledge, which for a distance of 350 feet is about 30 

 degrees. The vein presents the general characteristic features already de- 



3t 



i 



