DETAILEJ) DESCRIPTIONS OF THE RESPECTIVE COALFIELDS. 53 
parallel to the strike of the measures. Some of them, as on the 
west of the Jamuni, have considerable throw and render difficult 
the correlation of the coal seams. 
As in the Giridih and Raniganj fields dykes of mica-peridotite 
and basalt are common. The former are especially destructive and 
their evil effects on the coal as referred to above are more pro- 
nounced in this than in the above-mentioned coalfields. 
The coal resembles the Raniganj coal in appearance and much 
of it is perhaps superior in quality to the majority of the seams 
in that coalfield. Several of the seams furnish coal of good caking 
quality, that from Nos. 15, 14 and Bhowra A seams being perhaps 
the most valuable for the manufacture of coke. The average 
analysis by Ward of four samples from seams Nos. 12 (two 
samples), 13 and 17, is : — 
Volatile matter 29-14 
Fixed carbon 59-30 
Ash 11-56 
The following assays ^ of coal and coke were made in 1902 of samples 
selected by Mr. W. Jones, acting for Messrs. E. P. Martin and 
Professor H. Louis. 
The samples were cut uniformly across the working face of 
the seams, and the}' are consequently not open to the usual 
objection made against samples taken from a particular part of 
a seam : — 
No. of seam. 
Mois- 
ture. 
Volatile 
matter. 
Fixed 
carbon. 
Ash. 
Sulphur. 
Ks. of 
water 
evapo- 
rated 
by lib 
of coal. 
BEMABES. 
17 . 
1-40 
26-54 
59-76 
11-77 
0-53 
12-91 
15 . 
0-83 
21-79 
65-01 
11-92 
0-46 
13-18 
Average of 4 samples. 
14 . 
0-69 
18-60 
69-C8 
10-50 
0-53 
13-61 
Average of 3 samples. 
14 . 
1-06 
20-01 
55-80 
22-57 
0-56 
12-27 
One sample. 
13 . 
1-08 
20-00 
62-69 
15-64 
0-59 
12-74 
Average of 2 samples. 
12 . 
0-92 
22-02 
55-?;* 
20-50 
"-63 
12-47 
One sample. 
12 . 
1-14 
21-65 
62-28 
14-20 
0-73 
1316 
One sample. 
11 . 
0-68 
19-56 
57-39 
21-75 
0-62 
11-96 
One sample. 
Bhowra A 
0-78 
26-22 
65-99 
7-01 
One sample. 
1 Rec, a. S. I., XXXI, pp. 238-239 (1904). 
