CiiAP. XXXVI. ] 
NAGPUK : MANSAR, 
891 
amounts of nianganese-oro and air spaoo. (Consequently if the figures in 
the first two lines above be halved they will give the actual volume of the 
manganese-ore, as follows : — 
c. ft. 
c. ft. 
c. ft. 
7,100 
6,850 
5,600 
4,250 
1,900 
750 
and these correspond to the following percentages of ore in the material 
quarried : — 
Good ' boulder- ore" 
9 
7 
12 
8 
16-1% 
Bad ' boulder- ore ' 
5 
8 
3 
5 
2-1% 
Total 
15 
5 
16 
3 
18-2% 
9- Mansap Extension. 
(Central India Mining Company.) 
(See Plate 35.) 
This property — held by the Central India Mining Compan)^ — is a west- 
ward extension of the Mansar deposit (B, C, and A, in the sketch-plan, 
Plate 35). The ore was originally exposed for only a little way along the 
south slope of the low ridge of mica-schists that forms the westward 
continuation of the main Mansar ore-ridge. A series of excavations 
made along this line have exposed, for about 200 yards, the back of the 
ore-body, which, it seems, was in places just exposed at the surface, but 
more usually just below it. The ore-body, which here strikes roughly 
east and west, dips to the north side at 55° to 60° and is overlain by mica- 
schists. It often contains interlaminations of various rocks, such as mica- 
schist, soft white quartzite, and spessartite-bearing quartzites. The 
maximum width of the ore-band seen in any pit was 12 feet 9 inches 
measured horizontally, but it was not certain that this was the full 
thickness. Immediately underlying the ore -band there is usually a 
thickness of 1 to 6 feet of interbanded hard quartzite, soft manganese -ore, 
and yellow spessartite-bearing rock, doubtless to be regarded as part of 
the ore-body. Under this come the ordinary mica-schists. In one of the 
middle pits, however, a brown dolomitic limestone immediately underlay 
the ore-band. 
About 200 feet south of the west end of these pits is another (A), expos- 
ing what is probably a parallel band, perhaps taking up the main band en 
echelon ; or it may be the same band brought to the surface again by a fold. 
The ore is here overlain by vitreous grey quartzite with interlaminations 
of mica-schist and underlain by fine-grained micaceous quartzites followed 
