832 MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [PaRtIV: 
and estimates the amount of pyrolusite available in each division, 
arriving at the figure of 50,000 tons as a rough estimate of the amount 
of pyrolusite at Gosalpur. He makes the following comment (^.c, 
page 83) on this ; — 
' It must be remembered, however, that it is almost invariably associated with 
a little psUomclane, and that a good portion of this quantity consists of very 
small grains, mostly coated red outside by oxide of iron.' 
As anyone working this pyrolusite would probably take the larger 
pieces of ore only, it is evident that the amount of ore actually available 
must be much less than the above figure. And of the large pieces of 
ore originally available a large proportion has by now probably been 
removed by the glass workers and the succession of prospectors and 
geologists that have given their attention to this place. Were the 
pyrolusite of high quality, however, so that the ore could be sold at a 
special price for chemical purposes or glass working, then it is possible 
that it would pay to extract what is left. 
As regards the quality of the pyrolusite, it will be seen from the 
analysis of a sample (No. A. 16) taken by me and given on page 814 
from the following analysis made by Mallet on a sample of the ore 
carefully selected by himself, i and from one bv Gilchrist and Riley 
(page 833), that at least some of the ore is of high grade as regards 
manganese percentage, whilst the silica is low, and the iron com- 
paratively so. The iron is, however, probably too high for the ore to 
be able to command a special price for the glass industry : — 
Mn304 75-86 
Oxygep . 9-96 
F.,03 (with a trace of Al.Os) 4-53 
BaO . . . ' 3-55 
P„05 0-28 
Tnsolut le in HCl 2-74 
H„0 (c, mb:ned) 2-41 
Moisture 0-28 
99-61 
This is equivalent to : — ~ 
Manganese . . . . . . . .54-66 
Iron ......... 3*17 
Silica 2-74 
Phosphorus ........ 0*12 
and the amount of Mn02 is 83'00^. 
1 Bee. G. S. I., XII, p. 100. 
