ECONOMIC SUMMARY. 



57 



Regarding the excellence of the coal, the following assay may be 

 taken as giving a fair measure of the quality of the better coals. 



The specimen is from the larger of the Gondalpura seams : — 

 Carbon ... ... ... 64"5 



Volatile matter ... ... ... 27 "0 



Ash ... ... ... 8-5 



The amount of ash compares favorably with the ordinary Damuda 

 coals. 



Iron ores — occur in abundance. Within the field there are two 

 varieties — the clay iron ores of the ironstone shales and the hsematite 

 of the Barakar group. In the metamorphic area surrounding the field 

 magnetic iron ore is met with in several places. 



This variety of ores would be a great advantage to the iron manu- 

 facturer by enabling him to use judicious mixtures, so as to produce 

 every description of iron acceptable in commerce. 



The most abundant ore in the field is the clay ironstone of the 

 middle group ; and although no analysis of specimens from this field 

 have been made, it has probably the same composition as similar ores 

 from the Raniganj area, where the average amount of iron is 35 per cent. 



The richest ores come from the Barakar group, and yield from 50 

 to 60 per cent, of iron. 



The following list gives the percentage of iron of several different 

 varieties of iron ores collected by Mr. Donaldson and assayed for him at 

 the Geological Survey Office by Mr. Tween ; — 



1, Chepo Jiigra ... ... ... ... 56-8 



42-12 



2. Arahara (stream) 



3. Gondalpura (2 ft. seam) 



4. Mandu 



5. Belhargada 



6. Damiida river (12ft. seam) 



7. Mairan Kalan 



8. Arahara 

 h 



37-3 

 33-8 

 30-6 

 25-6 

 18-4 

 11-2 

 341 



