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a. A method of working small quarries or opencast pits in steps or
benches, in which rows of blasting holes are drilled parallel to the free
face. The benching method has certain dangers since the quarrymen must
work on ledges at some height. It is possible to work benches up to 30 ft
(9.1 m) high using tripod or wagon drills. See also:
bottom benching;
top benching. Nelson
b. The breaking up of a bottom layer of coal with steel wedges in cases
where holing is done above the floor. Nelson
c. Ches. The lower portion of the rock salt bed worked in one operation.
Fay
d. See: bench
Source:
Dictionary of Mining, Mineral, and Related Terms
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