Chap. XXVI.] 
THICK OEE-BAND IN A HILL. 
555 
deeper to which it is worth while to follow the deposit, the wider will be 
the workings necessary for opencast work, C 
3. The work of extracting the ore must be accompanied by a suit- 
able amount of deadworJc, i.e., extrsiction ol the ' country ' or wall-rock 
on either side of the deposit. Otherwise the workings will tend to take 
the shape of an ever-narrowing groove, from which it will be increasingly 
difficult and dangerous to extract the ore. 
4. Care should be taken when constructing buildings or tramways not 
to put them in places from which it may afterwards be necessary to 
remove them ; such as on top of an extension of the ore-body, or 
where they interfere with the proper working of the deposit. 
The above remarks may seem to be trite. But all the principles 
there mentioned have been broken again and again in the course 
of Indian manganese mining, usually through ignorance of the structure 
of the deposit being worked, and an eager attempt to obtain as much ore 
as possible without any regard for the future ; but sometimes, in cases 
where a qualified man is employed, because the management of the 
syndicate or company will not provide the funds required for the 
rational development of the deposit. 
I now take a few typical cases and give roughly what seems to me 
the best method of opening up and working'^the deposit in each. 
Figures 30 and 31 can be taken to represent cases found fairly 
. , , often in the Central Provinces, in which a bed- 
Ihick ore-band of moder- , , . . ^ ii f i,- i, 
ate dip forming n hill. bke ore-body gives rise to a small hill, oi which 
it forms the backbone. We can suppose that in 
each case the ore-body has been shown by the preliminary cross trenches, 
