a. A part of a bed of stone worked by quarrying.
b. Eng. Roof or floor removed to make height and side removed to make width. If above the seam, it is called a top canch; if below the seam, a bottom canch. A canch on a roadway close to the face is called a face canch; a canch on a roadway outbye is called a back canch. Also called brushing; ripping. SMRB
c. The face of the roof ripping in a roadway. It follows that the canch is continually being excavated and advanced. See also: ripping face support
Source:
Dictionary of Mining, Mineral, and Related Terms












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