700 
MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [ParT I V : 
The total breadth of the ore-bearing belt may be as much as 400 to 500 
yards. 
I obtained very few measurements of the thickness of the ore-bands, 
as they were usually so hidden in the jungle. The greatest was an outcro]) 
width of .30 yards seen where the track from Karparia to Bawldongri 
crosses the ore-bands on the low ground immediately south of East Hill, 
and the next greatest was on the South Hill of Thirori, where one band 
must be at least 35 feet wide ; while on the West Hill I obtained two 
measurements of 15 and 18 feet respectively and one in the Jamrapani 
nala of 9 feet. Taking 15 feet as the average horizontal width of each 
ore-band, 75 feet, or isq., — -20 of the total width of the ore-belt, may 
consist of manganese-ore, but the fraction might be as high as 
mo~i2- Taking the average angle of dip as 30° to 45°, the actual total 
thickness of the 5 bands of ore works out as 37 to 53 feet. This may 
however very easily be an underestimate, for the outcrop widths given 
above are not necessarily the full widths of the bands. The accompanying 
rocks are mostly mica-schists traversed (as also is the ore-band in places) 
by a muscovite-quartz-pegmatite, which often contains an iron-ore (mag- 
netite, martite, or hematite) and is sometimes of not very coarse grain 
and often apparently interbedded with the mica-schists ; hence in many 
places it seems doubtful whether this supposed pegmatite is a variety of the 
schists or really intrusive. 
On South Hill fragments of granulitic hornblende-gneiss were seen, 
while at a point near the east base of East Hill granulitic epidote-gneiss 
was found. As will be seen from the map the main portion of the ore- 
belt has a roughly north-north-east strike with local flexures. The ex- 
treme north end of it lies in Ponia village limits, whilst the remainder of 
this north-north-east striking portion lies in Thirori, where it gives rise 
to the three ridges that I have designated the West, East, and South 
Hills, and to the hillocks designated as the North Hillocks, and indicated 
as W, E, S, and N, respectively, on the map (figure 40). The 
belt curls round at its south end where it enters Jamrapani limits so as to 
run first east-south-east and then roughly north-north-east, over a 
range of low hillocks, where it is flexed into a S-shape, the north-east 
end of the S terminating in the Garaghat Government forest. Some 
1^ of a mile north north-east of this point is another isolated ore-hillock 
within Thirori limits ; this may indicate another flexure in the strike. 
I should note that a careful search may show that the belt extends further 
to the north in Ponia limits or to the north- east in the Garaghat forest. 
The dips in the southern parts of the belt are always directed out- 
wards or away from the rocks occupying the ground between the two 
