(225 ILCS 705/31.04) (from Ch. 96 1/2, par. 3104)
Sec. 31.04. If the air at an underground working face in a mine, when tested at a point not less than 12 inches from the roof, face or rib contains more than 1.0% of methane as determined by permissible methane detector, a permissible flame safety lamp, air analysis, or other recognized means of accurately detecting such gas, changes or adjustments shall be made at once in the ventilation in such a mine so that such air shall not contain more than 1.0% of methane.
(Source: Laws 1953, p. 701.)
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Last modified: February 18, 2015