Timbering in Thick Seams

CIM Bulletin1954
WE HAVE HEARD quite a lot recently on newer methods of supporting roof, such as roof bolting or the use of metal props and booms, but, with the exception of roof bolting, these methods are confined mostly to comparatively low, regular seams and even .bolting cannot be used to hold soft sides. Thus, where a seam of coal has great variations in thickness, or where it is faulty, or where the coal sides must be supported, nothing can wholly take the place of timbering with wood.
Keywords: Alberta, coal, duck, seam, timber, Coal, Development, Mine, Mines, pillar, Pillars, Raises, Skips, Timbering
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