Chap. XXVI.] 
THICK ORE-BAND IN A HILL. 
661 
carried down slice by slice as long as the work of removing the ' country ' 
on the hanging-wall side of the deposit did not become too expensive. 
This would depend on the relation between the slope of the hill and the 
dip of the deposit as the base of the hill was reached. It might be neces- 
sary in case the slope of the hill became very small to extract the last 
slice or two by means of a trough-like quarry, instead of removing all 
the ' country ' on the hanging-wall side at this level. As regards 
the ' country ' on the foot- wall side, this would probably have to be 
removed only for a few feet back from the foot-wall of the deposit, 
in a stepped fashion as illustrated, the stepping being for safety's sake, 
except in the case of very sound ' country '. As regards the disposal 
of the waste, it would probably be too expensive to send it to the scarp 
side of the deposit, after the first two slices had been worked, unless there 
happened to be a neck somewhere along the ridge through which a level 
for the waste could be run. Further, those portions of the waste derived 
from the workings towards the ends of the ridge could be run round these 
ends to the scarp side. But the waste from the middle portions of 
the ridge would probably have to be taken down the inclines on to the low 
ground on the dip side of the deposit. The above is given as a method 
suitable for a big thick deposit. The Balaghat deposit is an example 
of a deposit that is being worked after this method, with the modifications 
necessary to adapt it to the configuration of the ground. In the case of 
smaller deposits suitable modifications would be introduced ; but the 
general plan should be based on the above. 
In figure 31 we have a case similar to the above, except that the deposit 
the much increased amount of ' country ' on the hanging-wall side of the 
dips at a much steeper angle (80°) than that 
0 
D 
scale:- \ 
3(10 FEET 
Fig. 31. — Miningor quarrying a thick ore-band of stoep dip in a hill. 
