XXviii MANGANESE DEPOSITS OP INDIA. 
Paqb, 
Chapter XXV.— concluded. 
EuormoUs ioss to India through not manufactur- 
ing ferro-manganese ..... 541 
Chapter XXVI.— The Mining or Quarrying of Manganese-ores. 
General Principles for deciding whether to Mine or 
Quarry a Deposit ...... 
Mode of occurrence and structure of the deposit . 
Depths to which manganese-ores extend 
Relation of the outcrop of the deposit to the 
topography 
The value of the ores ..... 
Nature of the ' country' of the deposit 
The presence of water ..... 
Cost of timber, tools and plant .... 
Cost of labour. ...... 
Cost of emjDloying technically-trained managers . 
The Way to Prospect a Manganese-ore Deposit . 
The Way to Work a Deposit ..... 
Four mistakes to be avoided .... 
Thick ore -band of moderate dip forming a hill 
Thick ore-band of steep dip forming a hill . 
Thin ore-band in a hill ..... 
Thick ore-band cropping out on low ground 
Thin ore-band cropping out on low ground . 
Scattered ore-bodies in lithomarge . 
Lateritoid cappings ...... 
Deposits of detrital ore or talus-ore . 
Chapter XXVII.— The Mining or Quarrying of Manganese-ores 
— concluded. 
The Methods Actually Used in Working the Indian 
Manganese-ore Deposits ..... 567 
Indian manganese quarries legally mines . . 568 
Classification of deposits. .... 568 
Brief description of methods of working Indian 
manganese -ore deposits .... 570 
Gravity-inclines and aerial ropeways . . . 570 
Mining tramways and railways. . . . 571 
Sampling ....... 571 
Deposits often badly worked .... 672 
Waste of smalls and dust .... 672 
Waste of low-grade and siliceous lump ores . 673 
545 
546 
546 
548 
548 
549 
550 
550 
550 
651 
551 
553 
654 
555 
557 
658 
558 
659 
660 
562 
563 
