a. The space between the top or side of a car and the mine roof or wall. Fay
b. Technically, the annular space between downhole drill-string equipment, such as bits, core barrels, casing, etc., and the walls of the borehole with the downhole equipment centered in the hole. Loosely, the term is commonly and incorrectly used as a syn. for exposure. See also: exposure; inside clearance. Long
c. The amount of open space around a drill or piece of mining equipment in an underground workplace. Long
Source:
Dictionary of Mining, Mineral, and Related Terms












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