796 
MANGANESE DEPOSITS OP INDIA : DESCRIPTIVE. [pART IV : 
At the south-east end, where exposed by the four trenches, Nos. 1 to 4, 
there is a quantity of intercalated schistose, quartzose and felspathic 
material, and the 'country ' is peen to be partly soft spessartite- quartz- 
rock (gondite) and partly felspathic schists secondarily impregnated with 
manganese. The ore seen in these trenches, and in the nsila exposure 
(B) immediately to the south-east, is still fairly good, but shows evidence 
of deterioration in quality, which is further showTi by an outcrop in an- 
other nala about 300 yards to the south-east of this exposure where the 
ore-band has taken the form of an outcrop 9| feet wide, consisting of 
alternating layers of yellow-brown gondite — altered to soft ore in bands 
and patches — , schists, and fine-grained biotite-gneiss, with some vitreous 
quartz-rock. 
Regarding the distance to which this ore-band may be expected to 
extend, it will be seen from map, Plate 20, Rec. G.S.I. , Volume XXXITI, 
that about \ mile to the north-west of pit 1 the ore is cut off by crystal- 
line limestone, possibly due to faulting, and that the same thing occurs 
about \ mile to the south-east of exposure B. Hence the total distance to 
which the ore-body may extend is % mile. 
About 750 feet to the north- east of the above ore- band, pit 7 
exposes another inferior band, which is possibly further represented by 
a 5-inch band of gondite in the nala flowing to the east of the village. 
The rocks in which these two ore-bands cccur are mainly soft grey 
biotite-gneisses, biotite-felspar-schists, and muscovite-gneisses, the whole 
with thin intercalated bands of soft quartz-felspar-rock. 
We have here a case in which it is possible to make an estim.ate of the 
quantity of ore available ; for the main ore-band. 
Quantity of ore gju^^iates a coal seam in its regular strike, dip and 
available. ^ 
thickness between pit 1 and nala exposure B, though 
probably not in constancy of composition. We will take the total length 
between the above points as 1,600 feet, the average thickness of the de- 
posit as 6 feet, and the specific gravity of the ore as 4|. Owing to the 
diminishing quality of the ore at the south-east end, where it will need 
careful cleaning, and to allow for wastage, etc., we will reject 30 per cent, 
of the ore. Then if the ore continue in depth of the same quality and 
thickness as at the surface for 20 feet, the quantity of ore available is — 
l,600X6x20X62-5X4-5 
2,240 
= 16,875 tons, 
or say 17,000 tons. 
