1060 
MANGANESE DEPOSITS OF INDI4 : DESCRIPTIVE. [PaRtIV: 
while Plate 47 gives a good idea of the nature of this excavation. 
The depth approaches 100 feet at thp deepest parts. 
Fig. 82. — Rough sketch-plan of the Kodur Quarry (Jan. 1905.) 
The smoke from the pumping engines had sooted over all the walls 
of the quarrv except those recently cut, so 
The lithomarges. , . . , 
that it was by no means easy to examine the 
pits thoroughly. The soft rocks in which the ore-bodies lie consist 
largely of lithomargic clays of white, yellow, red, and pink, colours, 
often almost porcellanic in structure, together with abundant wad of 
dark brown and black colours, occurring as streaks, patches, and spots, 
in the above. Ochres also occur. When white the lithomarges are 
almost pure kaolin, and might perhaps be sorted out during the 
quarrying and sent to pottery works. A specimen of this kaolin was 
analysed by Mr. J. C. Brown of the Geological Survey of India with 
the following result : — 
Dried at 100° C. 
Combined water . . . . . . . 13-08 
Silica . 49-84 
Alumina ........ 36-96 
Lime ......... Traoef= 
~99^ 
Moisture 
