elxxxviii Proceedings of the Asiatic Society of Bengal. {N.S., XV. 
1. Singhbhum. 
(See Plate IT.) 
In Singhbhum a great batholith of granite (the Singhbhum 
granite) has lifted up the Dharwar 
rocks—chiefly phyllites and quartzites 
—which, consequently, as arule, dip off the granite. i- 
mately parallel to the N.E. and N. margins of this granite, but 
contained within the Dharwars, is a belt of old copper workings, 
which is continued to the west by further old workings associa- 
Copper-ores. 
related to the Singhbhum granite and the Akarsani grano- 
phyre).! Several miles to the north is a large intrusion of 
dolerite known as the Dalm: Trap and now altered to epidiorite. 
This trap also exhibits parallelism to the copper belt. But, 
At intervals along the copper belt we find, intercalated in 
e Dharwars, small lenticular bodies 
of magnetite-apatite-rock, which are 
specially abundant in Dhalbhum (at Patharghara, Badia, 
Sunrgi, etc.) and are so closely associated with the copper 
deposits that they often crop out in the sides of old work- 
i At one locality (Sunrgi) the magnetite-apatite-rocks 
are stained with green and yellow in- 
crustations of torbernite and autunite. 
On the dumps of the old workings are often found small 
fra ts of pegmatitic and granitic 
rocks indicating the existence of apo- 
physes of these rocks in the Dharwar sediments. 
At Kalimati, some five miles north 
Magnetite-apatite-rocks. 
Uranium. 
Pegmatite. 
doen of the granite, there is an isolated wol- 
fram-quartz deposit, and, at a much greater distance, moderately 
Argenti close to the Dalma Trap, lies the argenti- 
oe ferous galena deposit of Dhadka in 
Manbhum. 
stan S22, MAB accompanying V. Ball's «Geology of the Districte of 
ro hgigag and Singhbhum.” Memoirs, Geol. Surv. Ind., Vol. XVIII 
). 
