COMPARISONS AND ESTIMATED COSTS OF WORKING A THICK PITCHING COAL SEAM BY ADVANCING AND DOWNWARD METHOD, AND BY THE PROPOSED RETREATING AND UP\VARD METHOD

A paper read by J. A. H. Church before the Northern Alberta Branch last February described a method of working thick inclined coal-seams from the dip upwards, with the view to preventing fire risk by using water for the stowage of waste workings, and extinguishing a conflagration should such break out, was favorably received; but there was some doubt as to the cost of such a method, as it involves a retreating system, which might prove too expensive for practical adoption.
Keywords: Coal, coal, leasehold, miles long, mine, outcrop, Cost, Costs, Equipment, Mine, Mines, pillar, Pillars, Slopes
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