a. Scot. That part of the roof or floor of a seam removed to form roadways.
b. Digging up the bottom or taking down the top of an entry or room, where the seam of coal is too thin or shallow for the purpose of admitting cars. See also: brush
c. Cutting or blasting down the roof of a coal seam. Arkell
d. Ripping; normally enlarging a road by taking down the roof, but extended to sides and floor as well. Also called canch. Mason
e. Removal of dry enamel by brushing through a stencil or along an edge to produce a design or edging. Bryant
Source:
Dictionary of Mining, Mineral, and Related Terms












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