Notice on the Coal Mines of the Basin of the 

 •; Aveyron : * by M. le Chevalier Du Bosc, 

 Engineer of the Royal Mining Corps. 



(Annales des Mines, 1821.) 



THE department of the Aveyron is without contradiction, 

 of all those in the kingdom, that in which the thickest as 

 well as the thinnest known beds of coal are worked. This 

 assertion at first sight strange, ceases to be so when the dif- 

 ferent parts of this department are visited, in which the coal 

 mines occur. Enormous beds of coal will be seen in the 

 Canton of Aubin, some of which are more than from 15 to 

 20 metres [about 49 feet 6 in. to 66 feet 6 in.] thick 

 and in the Cantons of Milhau and its vicinity, coal seams are 

 worked which are generally not more than from 20 to 25 

 centimetres [8 to 10 inches] thick.t 



, [The author then proceeds to state that there are three 

 distinct coal basins in this department, including that of the 

 Aveyron — viz.] 



1st. The coal basin of the N.W, or of the Lot, which 

 belongs to the sandstone formation, :{: and contains the rich 

 mines of Aubin. 



2dly. The centre coal basin, or of the Aveyron, which 

 belongs to the sandstone formation ||. 



* In the coal basin of the Glane, and the rivers flowing into it(PaIati- 

 nat) numerous coal mines are opened on beds which are less than 2 

 decimetres [8 inches] thick. 



+ This is extracted from a detailed account of the mode of working 

 the mines, &c. in (his district. (Trans.) " 



i and |[ Coal measure sandstone I presume. (Trans.) ' ' 



