clearance
clearance
The space between the top or side of a car and the mine roof or wall
echnically, 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.
The amount of open space around a drill or piece of mining equipment in an underground workplace.