xciv 
MANGANESE DEPOSITS OF INDIA. 
[CHAPTER XXIV.] 
Valuation and Chemical Composition of Manganese-ores. 
Ores of manganese and iron are usually classified for commercial 
purposes into tliree groups : — manganese -ores, manganiferous iron-ores, 
and iron- ores. The second term is considered to be too loosely applied ; 
it is used to include ores containing a mucli larger percentage of man- 
ganese than of iron, i e., for ores that woidd be more accurately 
designated ferruginous manganese-ores. For classifying ores containing 
an amount of Mn + Fe equal to 50% or over the following figures are put 
forward : — 
Mn per cent. 
Fe per cent. 
Manganese-ores ...... 
40—63 
0—10 
Ferruginous manganese -ores .... 
25—50 
10—30 
Manganiferous iron-ores .... 
5—30 
30—65 
Iron-ores ....... 
0-5 
45—70 
Analytical figures are then given of samples and hand-specimens of 
Indian ores from the various districts and States, and also of the 
cargoes as received at Middlesborough ; and for comparison a table is 
given of analyses of manganese -ores from all parts of the world. 
Reference is also made to the following of the rarer constituents of 
Indian manganese-ores :— Al, Ba, Ca, Mg, K, Na, As, S, Co, Ni, Cu, Pb, 
Zn, Ti, combined water, and CO2. 
[CHAPTER XXV.] 
Value of the Indian Manganese-ore Production. 
By making use of the figures of cost of production given in the 
previous chapter and the curr.^nt market values of the Indian ore 
according to its analysis, detailed f.gures of the /. 0. b. or export value 
