230 On Mineral Veins. 
A like section is shown in Fig. 3, 
where a mineral vein b comes up to 
the unbroken cross vein @ in one 
branch, and at one hundred and 
fifty feet to the north, passes Pl, 
in three branches. 
Where the shifting or faulting of 
the vein is due to the sliding oe the 
sides of the vein crossed, the faulted 
vein will be found to curve back to 
the old line of bearing, as shown in 
Fig. 4, where the cross vein w ap- 
pears to have been faulted a dis- a 
tance of eighty feet by the sliding Hig. 3, 
of the sides of the mineral vein b. 
In the examples (Figs. 2, aL 
and 3) the unbroken veins or 
joints have been in existence 
before the mineral veins were 
agoregated, and the continuous 
line of the latter having been 
interrupted by the unbroken 
vein or fracture, they have 
formed on joints at some dis- 
tance from the original line of 
bearing. These are not soli- 
tary instances of the apparently — a 
faulted joints being of more re- Fia. 4, 
cent formation than the unbroken joints. 
One extensive mining district in Yorkshire is traversed 
by a strong east and west vein, having a vertical throw or 
fault in some places of two hundred and forty feet, and 
which has been traced over thirty miles in length. This 
vein is not ore bearing, but at irregular intervals it has 
several series of veins striking off from it on each side, and 
bearing a few degrees more to the north, which are the 
mineral veins of the district; and in none of the instances 
coming under my notice did the veins on one side of the 
cross vein correspond with those on the other in their 
relative distance from each other, although each series was 
evidently the same line of mineral veins. 
Whatever conclusions may be arrived at on this subject, 
Fig. 3, Rampgill mine. 
vay. 4, Scaleburn mine, Foster’s sections. 
