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The mixture of gases that remain in a mine after a mine fire or an explosion of combustible gases. It consists of carbonic acid gas, water vapor (quickly condensed), nitrogen, oxygen, carbon monoxide, and in some cases free hydrogen, but usually consists principally of carbonic acid gas and nitrogen, and is therefore irrespirable. See also: blackdamp; damp. Fay
Source: Dictionary of Mining, Mineral, and Related Terms

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