898 
MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [PaET IV : 
outcrop width of the manganiferous band is at the eastern end , where it is 
136 paces across ; but this consists of two outcrops, 74 and 42 paces across, 
respectively, separated by 20 paces of soil, which may correspond either 
to a part of the manganiferous rocks not exposed, or to a band of some 
softer rock such as mica-schist dividing the manganiferous rock into 
two parallel bands. At various points to the west much smaller out- 
crop widths were measured, namely, 12, 22, 15 and 30 paces. As the 
manganiferous rocks only just protrude from the ground their dip is 
usually not apparent ; but they are situated on the south slope of a low 
range of hills of quartzites. These quartzites are often greyish white and 
vitreous and weather into large blocks with some jointing ; at other times 
they are schistose, containing a variable quantity of muscovite. The 
strike of the quartzites is the same as that of the ore-band and the dip is 
everywhere to the south side at angles of 45° to 50°, except at the east end 
of these hills, where the dip is to N. iO° W. at 55". 
The manganese-silicate-rock is composed chiefly of rhodonite and 
spessartite, with some quartz and a little orthoclase and apatite. Some- 
times it is almost entirely composed of the manganese-garnet, the colour 
varying from brownish-orange, when fine-grained and compact, to orange- 
red, when separate spessartite crystals are included in quartz. This rock 
is sometimes very crumbly. Quartz occurs, not only mixed with the 
spessartite and rhodonite, but also as thhi white bands v/eathering out, 
and as black vitreous quartzite and dark grey fine-grained q uart/ite, inter- 
laminated with the manganese-silicate-rcck. In one place the spessartite- 
rhodonite-rock contains rosettes of a greyish-green to brownish amphibole, 
which occurs as asbestiform to prismatic radiations sometimes with a 
nucleus of spessartite. Thiis rock also contains a small amount of a 
rhombohedral carbonate — ? rhodochrosite. Both garnet and rhodonite 
are often quite black, tending to form hard grey braunite ore. But I did 
not see a single piece of ore that was merchantable. 
Mr. D. Laxminarayan reports the following output from this 
Output. deposit : — 
Year. Long tons, 
1906 742 
1907 495 
13. Dumpi Kalan. 
(Madhu Lall Doociar Mining Syndicate.) 
This deposit, although of no economic importance, is of interest be- 
cause it forms the western termination of the series of deposits Nos. 13 to 
21 (see page 896) that stretch in an west-east direction over a length of 
12 miles from Dumri to Khandala. I did not visit the locality myself, but 
