Chap. XXXVT.] 
NAGTTR : 
GUMGAON. 
853 
(2) A middle l)aiu' of decomposed felspathic mica-schist, 50 to JOO 
teet wide. Theee scliists being fofter than the rocks to the 
north and south form a depression along the niiddk; of the hill. 
(."5) A northern hand of micaceous schistose quartzites with an out- 
crop 200 feet broad at the widest part. 
Along its northern boundary this ore-body consists mainly of 
^ ^ J spessartite-quartz-rock, in j)laces with senondary 
The ore body. chaU'edonic silica. It shows a lateral transition 
along the ftrike into ore, which, however, still contains some unaltered 
yellow ganiet. 
The ore improves in quality with distance from the north edge of the 
deposit and is worked chiefly along the south face of the hill. The 
excavation situated in the middle of the southern slope of the hill was the 
only one being worked while I was there in 1903. It showed that the ore 
is divided by large divisional planes dipping at 70° to vertical to the 
S. 10°W.; these divisional planes evidently show the strike and dip 
of the rock. There are various other quarries along the hillside, all much 
longer than broad, and 10-20 feet deep, and showing ore of rather variable 
qualit)-. At the west end of the hill the manganese-ore runs up the hill 
with a distinctly bedded appearance, even as seen from | mile away. 
Here the ore is often much veined and streaked with qua^-tz. the 
streaks being usually at right angles to the strike. 
The quality of the ore is very varied. The psilomelane-braunite mix- 
ture of Kodegaon is again the principal ore, 
thf oie."'" """^ "^""^'^^ ^^'ith a specific gravity of 4-54 (small piece); 
but frequently the ore is a light steel grey, 
wholly crystalline variety, with a fine grey-black crystalline powder 
in the parting planes. A third variety is porous, soft, black, with lighter 
grey streaks, and is rejected by the quarry men, probably correctly, for its 
specific gra\ity is only 3-39, good merchantable ore usually having a den- 
sity of 4-5 or more. Finally there is a fourth, extremely in terestmg, 
variety. It is a spotted variety of the crystalline ore, designated cfnta. 
wdld patthar by the coolies. The spots are flattened parallel to the banding 
of the ore, from | to J inch or more in diameter, and perhaps -L to ^ inch 
thick. They may be either pinkish in colour or a dull sooty black. The 
microscope shows the pink spots to be really mosaic quartz, with undula- 
tory extinction and containing some black prismatic inclusions. The 
black spots also consist of quartz, but contain a greater abundance of 
dark material. This ore is probably some that has not been completely 
transformed from the original gondite or allied rock to the final stage, the 
spots being perhaps secondary segregations of the remaining free silica. 
As one piece showed a specific gravity of only 3-7], this ore is probably 
very siliceous. 
IV R 2 
