COMPOSITION OF COAL SEAMS. 



327 



iii, show the benches and partings represented in the first two columns 

 of the accompanying table and figure 13. Seam number ii dips south- 

 ward 15°. The upper bench of coal. 24 inches thick, is left up in the 

 rooms to form the roof. The sandstone lying above the seam occasion- 

 ally cuts out the slate over the coal. The thickness of coal is 7 feet 8 

 inches ; coal worked, 5 feet 2 inches. The roof of scam number ii is a 

 soapstone. This seam, though showing several thick benches, is not 

 worked on account of the partings. If worked in the future it will be 

 by the long-wall method. 



N? 2. 



Coal Seams of Red Lodge Mines. 

 N?3. N£4. 



N?5. 



Figure 13. — Coal Seams of Red Lodge Mines. 



.X umber ii Section. 

 Sandstone roof. 

 Shite <;" 



Slate 2" 



Coal n" 



Slate 2" 



Coal 21" 



Parting....:.... 2" 



Coal is" 



Dirl c" 



l loal, clean, ) 

 shackly, in" 

 fractured.. ) 



Parting I" 



Coal i" 



Fire-clay 6" 



-' tndstone. 



Number iii Section. 



Coal 



36" 



Slate 2" 



Coal 7" 



Slate H" 



Coal 5" 



Slate 2" 



• loal 6" 



Clay and ) ..„ 

 dirty coal J 



Coal, clean ... 24" 



Fire-clay... <5"-18" 



Coal 48" 



Slate. 



Coal 

 Clay 



Coal 



Number iv Section 



18" 

 3" 



40" 



Parting 1" 



Coal 24" 



Parting i" 

 Coal 18'* 



