ClIAP. XXXVI.] NAGPUR : KACIIARWAIII. 
023 
In February 1904, the bands of rock associated with the ore-layers 
Constitution of the Seemed to consist mostly of thick- and thin-bedded 
orc-body. quartzites, of dark grey colour, of either coarse 
or fine grain, and often containing disseminated manganese-ores. In 
December 1906, the excavations had in many places reached a depth 
of about 60 feet and the ore-body was much better exposed. 
Many additional rocks to those seen in 1904 had thus become un- 
covered. They included very friable rather fine-grained rocks composed 
of white quartz and mica flakes arranged in folia so as to render the rock 
schistose. These micas usually show some shade of rich brown, copper, 
brownish red, or even crimson, and are probably manganiferous varieties. 
Another rather common rock is a fine-grained granular rock of white 
quartz with numerous scattei'ed prismatic granules varying in colour 
from pale rose to rich deep crimson, the colour of this mineral often 
showing a gradual change from pale to deep in one hand-specimen. In 
one place a band of felspar-rock was found intruded between two layers 
of this rock, and it was then seen that the above-mentioned mineral 
is deepest in colour at the contact with the felspar-rock, lightening 
in colour away from the contact.'^ 
Excluding the rocks intrusive in the ore-body and to be noticed 
later, the ore-body may therefore be described as consisting of layers 
of manganese-ore interbedded with hard vitreous quartzites, often black 
in colour, and soft friable schistose rocks — usually consisting either 
of manganese-mica-quartz-schist or of blanfordite ( ?)-quartzite, but 
sometimes containing various granular minerals, not yet examined, 
in the same friable quartzite matrix. The ore-layers take the form 
of beds 5 to 10 feet thick separated by perhaps equal thicknesses of 
the rocks mentioned above, the actual layers of rock varying from 
an inch to one or 2 feet in thickness, and being often replaced by manga- 
nese-ore. The ore-layers themselves are often rendered worthless by 
thin inter-laminations of quartzite, etc., or patches of vein-quartz or 
felspar. From a hasty examination of this quarry in 1906 it did not 
seem as if more than ^ of the width of the ore-body could consist 
of layers of ore worth extracting ; thig is, however, possibly an under- 
estimate due to the ore-bands being obscured by wet detritus. The 
ore extracted is said to be of as good quality as it ever was, and this 
statement is corroborated, as far as manganese contents, by the 
figures given on page 927. 
The rock exposed in the south wall of the quarry at the time of my 
' Country ' second visit is probably the wall-rock of the ore- 
body, rather than a layer interbedded in it. This 
1 SubsequeDt micros.copic examination has shown that the crimsop mineral is an 
amphibole allied to juddito, ard that the rock containing it, and also many of the 
micaceous schists, contain felspar as well as quartz. 
