Faults. 23 
line E C, parallel to F G, and produce it till it inter- 
sects C D, at C. Through A C, draw the line C H, then 
C A, is the horizontal projection of the intersection of 
the fault:plane with the plane of the vein. Hence, Rule: 
The heaved part of the vein should be looked for’ on that 
side on which the plane of the intersection makes the 
larger angle with the plane of the fault, or in the above 
case at I J, since angle H A F, is larger than G A H. 
a 
LLLLETELLL LP 
FIG 12. 
Veins Faulted By a Dike. 
In Fig. 12, C C, represents a dike faulting the veins 
A and B. If the fault has been encountered at A, to 
find the heaved portion, proceed as in the last case. Now, 
if in another working the vein is lost at B, this vein hav- 
ing been faulted by the same dike C OC, it is evident that 
the horizontal displacement BB’ is equal to the distance 
A A’. If the horizontal displacement or heave A A’, is 
say, 200 feet, then the heave B B’ will also be found to 
equal 200 feet and the same amount of horizontal dis- 
placement may be expected of all other veins intersected 
