excii Proceedings of the Asiatic Society of Bengal. [NS., XV, 
gold, the quartz contains very small amounts of pyrit 
h 
Macl in hi rehensive work on gold, divides the 
pre-Cambrian gold deposits of India into two groups, viz 
those of Arc age associated with blue or grey quartz 
and those of Cuddapah age associated with white quartz found 
in the Dharwar phyllites and chlorite-schists of Dharwar nue 
Singh bite. With reference to the latter, Maclaren writes ! 
** In all cases it would appear that the auriferous solutions 
have been set in circulation by diabasic flows and intru- 
sions, but not even a guess may be made as to whether the 
gold was a to its present position by the uprising 
diabasic magma or whether the diabasic and dioritic 
tennibars found the schists already pisses and served 
only as carriers of heat and of solvent vapour 
For Singhbhum we have above adopted the tases alterna- 
tive, if the intervention of these basic magmas is to be 
admitted at all. 
In the case of the older group of gold deposits, such 
as those of Kolar, belonging to his Erythraean province, 
biokiblendé schists and t  aaanhabornies and an upper division 
consisting of greenstones, chlorite-schists, Bae chlorite-schists 
and talcose schists. They write (/.c., pp. 
“Maclaren has noted the above Tae, between 
the auriferous veins of the chloritic and hornblendic rocks 
the schists and gueisses and therefore of post-Archaean ney 
Weare unable to agree with this latter suggestion. It m 
be true that the dark veins in the hornblendic rocks are 
older and more crushed than the white veins of the chloritic 
series, but even this is by no means certain. egree 
of crushing is locally very variable in both cases, and some 
of the white veins show considerable signs of crushing and 
movement, and appear to be older than many of the barren 
veins of quartz and pegmatite which occur in the schists 
1 Gold: Its Geological Occurrences and Geographical Distribution, 
p. 54 b (1906). 
2 (Mineral Resources of Mysore, pp. 7 and 8 (1916). 
