COAL, EXPLORATIONS. 109 



to exist there at all) is such as to render it unworkable in the 

 present state of Indian mining. 



In a direct line from the Dhoramuda (No. 6) to the Kodopali 

 (No. 4) borehole is a distance of fully six miles. The country is 

 very jungly so that good surface exposures are practically absent. 

 Under these conditions it is obvious that any figures intended, at 

 present, to fix the relative horizons of the Kodopali and Dhoramuda 

 borehole must be viewed with a very elastic mind. I have stated 

 earlier in this paper that there appears to be still a thickness of 

 some 500 to 600 feet of measures between the bottom of the Dhora- 

 muda and the top of the Kodopali boreholes, but for the reason 

 given above this can be but a very rough approximation. 



Owing to their different geological horizons no correlation of 

 seams in the (Dhoramuda) borehole can of course be established 

 with those of the Kodopali borehole. Nos. 5 and 6 boreholes of 

 Dr. King (Rec. Geol. Surv. Ind., Vol. XIX) appear to have passed 

 through the same rocks as the Dhoramuda borehole. 



The seams met with at depths 184. feet and 62 feet in No. 6 bore- 

 hole (Dr. King) may be taken as the represent- 



Analogy of seams at 



Dhoramuda to those atives of the seams proved by the Dhoramuda 



proved by Dr. King (Rec. 



Geol. Surv. Ind., Vol. borehole at depths of 772 feet and 685 feet 9 



inches ; and those at 203 feet, 1I4 feet, and 37 



feet in Dr. King's No. 5 borehole as representatives of seams proved 



at Dhoramuda at 471 feet, 338 feet, and 309 feet. 



The data for such supposition are as follows:— 



Dr King's No. 5 borehole lies (as nearly as I can gather from the 



Records) f mile to the rise of the line of strike 



Coal seams proved in r , , , - -,, , , , , _ 



the Dhoramuda (1859) ot the beds at the Dhoramuda borehole, The 



Borehole. , . ... 



dip is not very constant over the intervening 

 country, but 1 in 12 is perhaps a fair average. From this it can be 

 found that a seam near the surface at the No. 5 borehole of 

 Dr. King (near Khaliabahal) will be about 276 feet deep at 

 Dhoramuda. This gives the correlation for Dr. King's No. 5 bore- 

 hole, and since the main sandstone bands fall in more or less 



( 21 ) 



