316 



Mr. Buddle on Mining Records. 



ing of the pillars had taken place, the discharge of inflammable air gra- 

 dually diminished. 



METAL COAL 



Coat. 



The Metal Coal Seam has been worked, to a very limited extent only, 

 in the C and G pits. It produces coals of respectable quality and of a 

 good riibbly size, and was approved in the coast markets, but it could not 

 be worked to profit, owing to the seam, as well as the roof and Thill, being 

 broken and dislocated by the creep in the High Main Coal, which lies 1\ 

 to 8 fathoms above it, as shewn in the annexed diagram, which is drawn to a 

 scale, shewing the relative proportions of the pillars and excavations, or 

 board-rooms, in the Main Coal Seam, and the manner in which the rising 

 of the metal ridges, in the latter, has fractured the Metal Coal Seam, as 

 well as the strata between the two seams. To a certain extent, the pillars 

 of coal in the Main Coal Seam were 10 yards thick, and the board-rooms 

 were 5 yards wide, as represented in the Diagram. But, in a great part of 

 the colliery, the pillars were only 8 yards thick, and the boards 4 yards 

 wide, in which case the fractures of the Metal Coal Seam occur more fre- 

 quently than is represented in the diagram. 



Main- 



Coal 



Seam. 



