560 MANGAJSTESE DEPOSITS OF INDIA : MINING. [PaET III : 
desired to win the ore down to this depth, the deposit should be treated 
j! d' c' b' 
Fig. 33. — A thin ore-band cropping out on lowjgi-ound. 
like a mineral vein from the beginning, and worked by inclined shafts 
following the dip of the ore, and stoped right out- The deposit at Gowari 
Warhona in the Chhindwara district, Central Provinces, is a case in 
point. The dip of the deposit is about 50° as seen in nala sections, and 
its width is 5| to 6 feet. The depth to which the ore extends is as usual 
unknown ; the proper way to treat this deposit would be first to bore 
it and see to what depth workable ore extends. It might only be tested 
to depths of 150 to 200 feet at fijst. Then, if the ore were found to 
extend to only 50 feet or a little more, calculation might show 
that it would be cheaper to quarry the deposit. But if the ore were 
proved to continue to 100 feet or more, then calculations would probably 
show it to be a case of either mining the deposit or leaving it alone 
altogether. It would not be a fair thing to extract what could 
be won by opencast work and abandon the remainder. The deposit 
should therefore either be mined, or let alone altogether until such time 
as an improvement of communications or prices allow the deposit to 
be mined. From figure 33 it can be seen how expensive it would be to 
quarry down to a depth of 100 feet. To win the ore DE between the 
80-foot and 100-foot levels, it would be necessary to remove all the 
' country ' EE' D'D ; and the deeper the quarry became, the larger 
would be the amount of dead work necessary to win each 26 feet of ore 
measured on the dip. 
We can now consider the case represented in figure 34, which may be 
taken as a generalized expression of the condi- 
Scatteredore-bodies in ^-^^^^ obtaining in some of the Vizagapatam 
hthomarges. _ _ . . 
deposits, although in these deposits there is 
usually some sign of arrangement of the manganese-ore bodies parallel to 
