CiiAP. XXXVI.] 
NAGPUR DISTRICT. 
839 
The following table shows the annual output of this district from 
1900 to 1907, and the average daily number of 
coolies employed throughout this period : — 
Out pill and liibciiir. 
Vcai-. 
of iiiangaiK'>ic-oi'o in 
loiii; tonis. 
Average daily number of 
workers. 
1!)U0 
1901 
1902 
1903 
190-1 
1905 
1906 
1907 
47,257 
76,925 
68,819 
95,051 
66,142 
100,063 
146,117 
199.311 
(a) 
1,460 
1,676 
3,543 
1,651 
1,904 
2„345 
3,924 
The manganese-ore deposits of this district occur in the large area 
^ J of Archaean rocks stretching from the Chhindwara 
° and Nagpur districts on the west, through Seoni 
and Rhandara, to Balaghat on the east. In the last-named district it 
is in part possible to separate from the Archaean complex, under the 
name of the Chilpi Ghat Series, a series of metamorphosed sediments 
in which are situated the manganese-ore deposits. In the Nagpur 
district, where the metamurphisni has been much more intense than 
in tlie parts of the Balaghat district above referred to, no such separa- 
tion could be made without very detailed field work accompanied 
by a minute microscopic study of the rocks. Consequently, on the 
map (Plate 43) of the Nagpur-Balaghat area, the whole of the crystalline 
complex in the Nagpur district has been coloured pink, the manganese- 
ore deposits alone being indicated by a different colour — blue. 
This crystalline complex consists of acid gneisses, pyroxenic gneisses, 
hornblende-schists, mica-schists, quartzites, crystalline limestones, and 
calciphyies, with intrusive granite and pegmatite. A perusal of the ac- 
count given elsewhere! of the Archaean rocks of the manganese area 
of the Chhindwara district will convey a very good idea of the characters 
of the Archaean rocks of the Nagpur district, which are essentially 
the same. In the Nagpur district these rocks are arranged in parallel 
bands having a general east to east-south-east strike, often varying 
1 Rec. G. 8. I., XXXIII, pp. 159-220, (1906). 
