ECONOMIC SUMMARY. 19 
In contrast to the absence of igneous rocks in the Damüdá and 
Talehir series, is their abundance beyond the limits of the field. Along 
the southern boundary near Panki Loharsi, Kundri and elsewhere, there 
are little hills of what I would call greenstone; and again on the north 
there is a very conspicuous hill called Kálápahár, entirely constituted 
of broken pieces of the same rock. 
. Economic SUMMARY. 
On aecount of the limited area occupied by the Barákars and the 
paucity of coal seams, the economie value of this field is small. There 
is indeed but one workable seam—that which occurs at Pandáa and 
Rajhéra ; and in calculating the available yield of coal, I would leave out 
of consideration the seams at Singra and the one in the Sádábah river, as 
they would only be worked for supplying fuel should their proximity to 
a lime or brick-kiln give them the advantage of position over the Rajhéra 
seam. For any demands from a distance that may be made upon the 
Daltonganj field, the Rajhéra (or Pandáa) seam only would be available, 
and as I question whether any loeal demand will ever arise, a computa- 
tion of its yield will give the true index of the value of the field. The 
area covered by this seam may be assumed to be three miles by one, and 
assuming that there is 6 feet of coal, the yield would be 18,000,000 tons. 
But a considerable correction has to be made on account of the specially 
irregular character of the coals of this field, and on account of waste, &c., 
in working. From the 18,000,000 tons of available coal I do not think 
a deduction of f would be excessive, and we shall have remaining 
11,600,000 tons of available coal. 
Although this amount is small, it is sufficient to supply for the next 
50 years any centres of economy that might find it advantageous to 
draw their fuel from the Daltonganj field. 
) 343 ) 
