DETAILED DESCRIPTIONS OF THE RESPECTIVE COALFJELDB 2I 
is less than three miles. The general dip of the strata is to south 
30° east at a very high angle and the boundaries of the field are 
faults. There are not more than two or three known coal-seams 
and their thickness does not exceed 3 feet. An analysis of a two 
feet band in a seam of three feet thiekno.ss gave : — 
Moisture ... .... 6-8 
Volatile matter ....... 3o-8 
Fixed carbon ....... 52-9 
Ash 6-5 
Disai} — This field is situated on the Disai river about H 
miles south-west of the Janji field. It has not been thoroughly 
explored and its boundaries along the strike of the measures are 
unknown. The proved length of the outcrops is about 5 miles. 
The prevailing dip is to south 30° east at varying angles, but there 
is a considerable amount of irregular disturbance. Five or six coal 
seams have been discovered ; two of which have thicknesses of three 
and four feet, respectively. The coal is soft and much crushed. 
An analysis of the four feet seam gave :■ — • 
Moisture ....... 3-4 
Volatile matter ....... 36-9 
Fixed carbon ....... 54-9 
Ash 4-S 
The Mikir hills. — The Mikir hills occupv a tract of country Iving 
to the south of the Brahmaputra, between Nowgong and Golaghat. 
The Jamuna river, with its tributary the Deolao cuts through 
the hills from east to west, some 20 miles north of Lumding, dividing 
them into the north and south Mikir hills, the former also being 
known as the Rengma hills. 
In 1896-97, Mr. F. H. Smith ^ found exposures of coal in the 
following localities within the area. Longloi hill, Meyongdisa valley 
(Dilangsao and Langator streams), Diphu river and Nambor river. 
In only the first and last mentioned places did he consider the 
deposits to be of any economic importance. 
Longloi. — On the thickly jungle-clad slopes of Longloi hill a 
single exposure is seen of a coal-seam of doubtful Cretaceous age, 
12 f<^et thick dipping from 10° to 20° to north-north-west. The 
^ Mallet : op. cil., p. 76. 
2 Mem., G.a.I., XXVI II, p. 93 (1900). 
