odo 
MANGANESE BiiPOSITS OF INDIA : ECONOMICS. [pAttT III 
from different soui'ces show a different average value for Mn-f-Fe, and 
(2) that iron-ores, containing 5 to 15% Mn. which in the fore 
going classifications would be designated iron-ores without any qualify- 
ing adjective, would yet command a special price on account of the 
manganese present, and (3) that ores containing more than 10 % iron or 
possibly more than 8 %) had better be classed ae ferruginous manga- 
nese-ores, and (4) that some iron-ores give nearly 70 % Fe. on bulk 
analyses, I propose the following, 'or something very close to it, 
as a more rational classification than the one at present in use : 
Mn. per cent. Fe per cent. 
Manganese-ores ..... 40-63 0-10 
Ferruginous manganese-ores . . . 25-50 10-30 
Man^aniferous iron-ores . . , . 5-30 30-65 
Iron-ores ...... 0-5 45-70 
This table is applicable to all ores with over 50 % of Mn + Fe. It will 
also be found to apply to many with less than 50 % of Mn + Fe. 
For ores wibh M,i+ Fe less than 50 it would be easy to construct 
another table. 
The classification of ores in this way is roughly conformable with 
the product to be manufactured from each The four divisions corres- 
pond roughly to higher grade ferro-manganese, low-grade ferro-manga- 
nese, spiegel-eisen, and pig-iron. 
Analyses of Indian Manganese-ores. 
In the following tables I group together for convenient reference the 
Tibl of inil se- analyses that have been made of bulk samples 
collected by myself either from the outcrops, or 
from the ore-stacks, of the different Indian manganese-ore deposits. 
In cases where I have not taken samples I give analyses kindly supplied 
to me by the companies or individuals working the deposits. These 
analyses are also scattered throughout the text of the descriptive 
portion of this Memoir under the headings of the respective deposits. A 
