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  1. A term improperly used by some diamond drillers as a syn. for air circulation. See also: air circulation
  2. A disturbance in underground workings accompanied by a strong rush of air. The rush of air, at times explosive in force, is caused by the ejection of air from large underground openings, the sudden fall of large masses of rock, the collapse of pillars, slippage along a fault, or a strong current of air pushed outward from the source of an explosion. Long
    Source: Dictionary of Mining, Mineral, and Related Terms

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