a. In the States and Territories of the United States west of the Missouri River (prior to 1880), a vaguely bounded and temporary division and organization made by the inhabitants of a mining region.
b. A limited area of underground workings. Nelson
c. A coal mine is generally divided into sections or districts for purposes of ventilation and daily supervision. Nelson
d. An underground section of a coal mine served by its own roads and ventilation ways; a section of a coal mine. CTD
Source:
Dictionary of Mining, Mineral, and Related Terms












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