a. The dusting of underground areas with powdered limestone to dilute the coal dust in the mine atmosphere and on the mine surfaces, thereby reducing explosion hazards.
b. A very widespread control measure used in coal mines to combat explosive dusts. By machine, inert (combustible) dust is sprayed, dry or wet, on the roof, floor, and ribs in all working places and haulageways, to reduce the explosibility of settled coal dust. The Mine Safety and Health Administration requires rock dusting to within 40 ft (12 m) of the face. The incombustible content of settled dust samples after rock dusting must constitute 65% or more by weight, with an increase of 1% for each 0.1% methane present. A dust as nearly inert, physiologically, as possible, should be employed in rock dusting; limestone (calcium carbonate) is most widely used. Hartman, 2
Source: Dictionary of Mining, Mineral, and Related Terms












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