Ch. IX.] VEINS IN PRIMARY ROCKS. 185 



2. One vein intersects several veins which are parallel^ or 

 nearly so, with each other. " In the Weeth Mine (near Cam- 

 borne, in slate), two cross-courses are traversed by the same 

 E. and W. lode; the direction of one (a) is 10 W. of N., of 

 the other (), about 10 E. of N : the former, is heaved three 

 fathoms to the left ; the latter, also three fathoms, but to the 

 right hand. It is, moreover, particularly worthy of remark, 

 that, whilst these two cross-courses are intersected by the lode, 

 the latter is itself separated and heaved by a third cross- 

 course (c) : as exhibited in the next figure, taken from 

 Mr. Game's paper on Veins. 



Fig. 19. 



Weeth Mine. (Ground Plan.) 



In Ting Tang Mine, the main lode, bearing ] S. of W., 

 and the middle lode, bearing 21 S. of W., are both heaved 

 to the right hand by the western flucan, which runs 1 5 W. 

 of N. : and the amount of these heaves, in the respective veins, 

 does not correspond at different depths ; thus, 



The main lode is heaved, The middle lode 



at 90 fathoms deep, 21 feet 21 feet 



120 - 30 21 



130 - 8 36; 



and the same lodes, when traversed by the middle flucan, 

 which bears 36 W. of N., exhibit similar irregularities." 



3. One vein is often traversed by several cross veins 9 and the 

 intersected parts are not always heaved to the same distance. 



