a. To remove a horizontal section of kerf in the bottom of a block of coal to facilitate its fall. See also: underhole; undercutting. BCI b. To undermine, to hole, or to mine. To cut below or in the lower part of a coalbed by chipping away the coal with a pick or mining machine. Undercutting is usually done on the level of the floor of the mine. See also: cut; undermine. Fay c. A machine cut along floor level in a coal seam to ease its removal by hand, machine, or shotfiring. See also: holding d. Excavation of ore from beneath a larger block of ore to induce settling under its own weight. Nelson e. In stoping, removal either of footwall or of the lower part of a a flattish lode, bed, or seam of ore or coal, thus facilitating detachment of the portion left hanging. Method used in block caving to induce caving in. Pryor, 3 f. To enlarge a drillhole at a depth that has been previously drilled. Source: Dictionary of Mining, Mineral, and Related Terms
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