No. 1.] GEOLOGICAL SURVEY OF CANADA. 67 



Ft. In. 

 Good coal with a smooth parting two feet nine inches from 



the bottom, (^fuU coal) 5 9 



Light gray soft fireclay ; it varies slightly in thickness ; 



(holing) 3 



Good coal, top bench 1 5 6 



Gray hard coal, giving a pink ash. [ 6 



Good coal, second bench 



Coarse coal, not worked 



)■ 



4 6 

 2 1 



18 7' 

 Underground Worhings. 



The present workings consist of two working slopes driven 

 about 900 feet from the crop of the seam, the dip being about 

 16^ at the surface, decreasing to 14^ at the lower level, at 730 

 feet from the surface. The size of these slopes is 9 by 9 feet, 

 with a central barrier of coal between them of 28 feet, each slope 

 having a single track and travelling-way. Main levels for two 

 lifts have been driven from the slopes north and south upon the 

 seam, the north levels being worked from No. 1 slope and the 

 south from No. 2 ; thus far I believe the lower levels have been 

 most extensively worked, a considerable amount of coal being left 

 near the crop for safety. I have not had an opportunity of ex- 

 amining a detailed plan of the workings, but my inspection of 

 them would lead me to believe that the system of pillarage is 

 planned with more than usual regard for safety. Both the post 

 and stall and counterbalance systems of getting the coal were at 

 first tried with a view of ascertaining their comparative economy, 

 and I believe that Mr. Dunn has selected the counterbalance 

 system for the future working of the mine. 



But little water has as yet been met with, and it is at present 

 raised by water cars, no pump having been found necessary. 



Over-ground Works, 



The arrangements at the surface seem exceptionally well plan- 

 ned and have given great satisfaction. At the head of the slopes 

 a large heapstead or covered screening platform is erected for the 

 separation of different sizes and qualities of coal, and for banking- 

 out. The coal boxes are drawn on to this platform in trams of 

 from five to twelve (holding from 500 to GOO pounds each) and 

 thence delivered by dumps on to the screens, where the coal is 

 separated, as at the Acadia colliery, into three sizes : round coal, 



