768 MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [PaBT IV : 
the ore by an argillaceous layer. The ore-band is composed largely of 
Nature and qunlity very dirty ore, some of which is a jjsilomelane- 
of the ores. braunitc mixture with soft black spots and patches, 
and some of which is psilomelane passing in places into soft wad-like ore. 
tin}' brannite octahedra being often scattered through both the hard 
and soft portions of the ore. There is also some cavernous boryoidal 
psilomelane, which sometimes passes into red ochre and contains 
reddish clay in the cavities. 
No manganese silicates were seen in this deposit, and this fact, taken 
in conjunction with the sooty nature of the ores, their admixture in places 
with red and yellow ochres and the evident replacement of the quartzites 
in places, indicate that this deposit is to a large extent the result of re- 
placement of the quartzites along their bedding planes. 
Some few hundred tons of ore had been extracted and from the ore- 
heaps I took sample No. 37 consisting mostly of cavernous and dirty 
psilomelane with a small proportion of the psilomelane-braunite mixture. 
The analysis made at the Imperial Institute is as follows : — 
Sample No. 37. 
Manganese peroxide . . . . . . . . 57 ' 46 
Manganese protoxide . . . . . . . . 20" 25 
Ferric oxide .. .. .. .. .. 5' 52 
Silica (combined) .. .. .. .. 1'8I 
Silica (free) .. .. .. .. .. 0-80 
Phosphoric oxide .. .. .. .. 0'38 
Moisture at 100°C. .. .. .. .. M5 
This is equivalent to : — 
Manganese .. .. .. .. •. 52-09 
Iron .. .. .. .. .. 3-86 
Silica .. .. .. .. .. 2-61 
Phosphorus .. ■• •• •• 0'166 
Moisture .. .. •• •• 1-15 
and indicates that the average ore consists largely of psilomelane and soft 
oxides with only a small proportion (18%) of braunite. The percentage 
of manganese shown by this analysis is somewhat higher than I expected, 
judging from the nature of the ores. 
As the deposit is situated only 8 or 9 miles from Tumsar Road Rail- 
way Station, Bengal-Nagpur Railway, it is obvious 
deposir°' "'^ ^ that, if much ore of the above quality could be ob- 
tained, it would pay to work this deposit. The 
ore-band is, however, of small and irregular thickness, and as it goes 
