100 



Prof. J. Prestwich. 



I 



II 



Ill 



IV 





Number 











in 

 general 



list, 

 Table I. 



Name of mine and place. 



Nature of rock. 



Depth. 







rflf) ft 1 n yi n, . .c k c\Y\\"\ mipn 





Feet. 





49e 





Slate. 



33 

 33 



222 

 480 

 600 









33 



768 





11 







1248 





51 



TlPvmi sill it»a VV VipqI TTt»i An r\ aVnn 



-L/ C V U 11 £11 11 C VV UtJctl JJ I IClILlblJlU >.< 





282 

 810 

 282—810 







n 



33 

 33 





26 





».. 



930 





28 





Granite. 



768 





38 





Slate and granite. 



1380 





16 





>3 



1530* 





11 





33 



1530 





16a 





33 



1530 





40 





Granite. 



1740 





39 





33 



1572 





18 





33 



1572 





19 





33 



» 



2112 

 2112 





30 





Slate. 



33 



300 

 756 

 1056 

 300- 1056 





80 



,, United or Fowey Consols 



Slate. 



1728 





82 



J) 33 33 





1530 





52 





Granite. 



33 

 33 



108 



462 

 810 



462 810 





53 



„ Wheal Wreath, St. Ires . 



33 33 33 

 33 33 33 

 33 3) 33 



33 33 33 



33 

 33 

 33 



162 

 1242 

 1482 

 162—1242 

 1242—1482 

 162—1482 





18 



„ Average of six mines. . . . 



Granite and slate. 



500—550 





