Pt. III.] 



ECONOMIC GEOLOGY — SUMMARY. 



187 





West 



of the Field 





1. Chinakuri seam 





10 J 



Hirakhund. 



2. Sath Pokaria ditto 





4 





3. Gviskm ditto 





8 



Asansol, Mainanagar ? Dhadkia ? 



4. Nmga ditto 



.. 



7 



Sripiir. 



5. Purikarpur ditto 



.. 



9 





6. Gharwi ditto 





10 



Fattipur, Baracliuk. 



7. Dkanwa ditto 





. 12 





8. Sitaranrpiir ditto 





8 





9. Charnpiir ditto 



,. 



13 



Samsundarpur, Baraboni ? 



10, Hatinal ditto 



.. 



10 





11. Deoli ditto 



.. 



4! 







Lower Damuda. 





1. Chanch seam 





9 



Nuckibad. 



*2. Durnarkkunda ditto 





9 





3. Lalbazar ditto 



,, 



18 





4. Kasta ditto 



3. 



33 to 35 





Thus, in the Kanlganj beds, nine seams, (perhaps eleven,) with an 

 aggregate thickness of 120 feet, are worked in the Eastern portion of the 

 field; eleven (perhaps thirteen) seams, amounting to about 100 feet, in 

 the Western portion, and four seams, with a thickness altogether of 69 

 feet, in the Lower Damuda. But many other seams are known to exist 

 in all these areas, and are enumerated in the preceding pages, while the 

 beds in the Raniganj series, West of the Nunia, may be considered as 

 replacing those East of that stream, although it is by no means certain 

 that any known seams in each locality exactly correspond. 



Before, therefore, any reliable statement can be put forth of the 

 absolute thickness of coal in the Raniganj field, 

 far more extensive underground explorations will 

 be necessary, and as the total available quantity of coal depends, in the 

 first place, upon the thickness of each seam ; and, secondly, upon the 

 area underlied by that seam at such a distance beneath the surface, as 

 to be accessible by ordinary mining operations, the problem of 

 ascertaining the whole amount is one for which none of the requisite 

 data are sufficiently exact. It has been conclusively established 



* Perhaps Nos. 1 and 2 are the same. 



Total thickness of coal. 



