Widely used for draining methane in coal mines in the United States where the room-and-pillar method is employed. They are panel entries driven on a perimeter of a block of coal being mined and maintained as exhaust airways to remove methane promptly from the working faces to prevent buildup of high concentrations either at the face or in the main intake airways. They are maintained, after mining is completed, in preference to sealing the completed workings. Hartman, 1
Source: Dictionary of Mining, Mineral, and Related Terms
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