Chap. XXXII.] 
BALAGHAT : UKUA. 
729 
The ore-band is composed of bands of manganese-oro and fine-grained 
Character of the grey, purplish, and red, quartzitcs, with some of 
"ro-biiul. the vitreous bhxck quartzites full of tiny black rods 
of some manganese mineral. There are also some bands of typical 
fine-grained spessartite-quartz-rock (gondite), varying in colour from 
yellowish-buff to purplish (when there is red iron-oxide dust in the spes- 
sartite) and often somewhat blackened (Plate 12, fig. 1). Near the 
south-west end of the band tlicre is one outcrop of rock in which the 
ore and quartzite has apparently been brecciated and re-cemented by 
quartz which also veins the ore and quartzite. 
The manganese-ores are rather variable in mineral composition. 
Nature and quality The ores in the part of the deposit to the south- 
of the ores. west of the road from Ukua to Gudma consist 
usually of hard grey, often metallic-looking, psilomelane, frequently 
containing a certain proportion, often very small, of minute scattered 
specks of braunite. This ore is often cavernous with a soft black powder 
in cavities. A sample taken all along this part of the outcrop was ana- 
lysed at the Imperial Institute with the following result : — 
Samjile No. 61. 
Manganese peroxide . . . . . . 67' 70 
Manganese protoxide . . . . . . 10" 76 
Ferric oxide 10-42 
Silica (combined) . . . . . . . 1'75 
Silica (free) 0-42 
Phosphoric oxide ....... 0'54 
Moisture at 100°C 0-40 
This is equivalent to : — 
Manganese . . . . . . . . 51 ■ 23 
Iron . . 7-29 
Silica 2- 17 
Phosphorus ........ 0*24 
Moisture 0-40 
and indicates that the average ore in this part of the deposit contains 
17-5% braunite, the remainder being mostly psilomelane with a little 
soft black oxide. 
In the parts of the deposit to the north and north-east of th.e Gudma- 
Ukua road the manganese-ore consists chiefly of the mixture of braunite 
and psilomelane typical of the Nagpur district, and varies from the 
very fine-gramed variety to that in which the braunite facets are up to 
\ inch across. A sample was taken along this part of the deposit, from 
