a. The weight of that portion of the strata overlying a coal seam at the face, which is supported by the timber or steel props. See also: nether roof; overarching weight; traveling weight. Nelson
b. A diamond bit, the crown of which is inset with diamonds so widely spaced that part of the crown is without cutting points and the bit cannot be made to cut. Fay
Source: Dictionary of Mining, Mineral, and Related Terms











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