SOUDAN FORMATION. 



237 



raise, which passes throug'h the level and from which rock for the filling- 

 is obtained, with a loaded tram car below its mouth. This raise extends 

 upward through the foot wall, with ore forming the front side of the raise, 

 to the level above, through which it passes in a cribbed wa}', and so on to 

 the surface. Below the point shown in the figure the raise is cribbed, and is 



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Fig. 15.— Longitudinal section tlirough Soudan miuu 



carried by this cribbing through the fills on the various levels Ijelow. To 

 the left is shown a diamond drill, used in drilling holes in the ore forming 

 the roof of the stope, iiito which dynamite is then introduced and 

 discharged, Ijringing down enormous masses of the ore. 



The rock for this filling is obtained from the raises which are cut in 

 the soap rock at the foot or hanging wall, and which communicate 



