Produce ojihe Copper Mines of Great Eriiain. 69 



has disappeared, it may then be difficult in tact to distinguish 

 between them. But between both of these and the newer red 

 sandstone there is a complete and total separation. To those 

 rocks the newer red sandstone is unconformable in position, 

 and whenever in contact with them reposes on their basset 

 edges : it is usually unaffected by the faults and disturbances 

 to which they are subject ; it is itself partly made up of the 

 fragments derived from their ruins ; and must therefore have 

 been deposited after their consolidation, dislocation, and partial 

 destruction. It is impossible, therefore, to imagine any 

 stronger grounds on which any two series of rocks can be re- 

 garded as distinct : and should we agree to throw these to- 

 gether, we might with equal propriety consider all groups of 

 strata, in which beds of limestone occur, as belonging to one 

 great calcareous formation, and treat as subordinate all the 

 rocks that happen to alternate with limestone. But this 

 would be in fact to confound together almost all the rocks 

 with which we are acquainted. 



PRODUCE OF THE COPPER MINES OF GREAT BRITAIN. 



Quantity of copper raised from the mines of Great Britain 

 in the last six months, ending December 31, 1824: 



Quantity of Ore. Quantity of Copper. 



Toils. Tons. cwt. qrs. 



Mines in Cornwall . . . 53,514 . . . 4, 119 16 2 



Devon .... 3,030 ... 308 1 2 



Various mines, including 'i 



Ireland, sold in ore at > 2,598 ... 250 12 3 



Swansea .... J 



59,142 4,678 10 3 



Anglesea and Stafford- 1 „^q „ „ 



shire estimated at . / 



5,028 10 3 

 The 4427 tons, 18 cwt. of fine copper raised in Corn- 

 wall and Devon is the produce of 80 mines, of which the fol- 

 lowing six are the principal : 



Ores. Fine Copper. 



Consolidated Mines . . . 7767 tons 712 tons. 

 EastCrinnis 3677 . . 309 



'^\ 

 Beauchamp .... J 



Wheal Friendship (Devon) 1757 . . 220 



Pembroke 4221 . . 216 



Dolcoath 3418 . . 215 



1899 tons. 



Copper ores arc weighcti at ^1 cwt. lo the ton, and fine copper at SJO cwt. 



OPENING 



Wheal BuUer and Wheal f nooa 227 



