(225 ILCS 705/5.09) (from Ch. 96 1/2, par. 509)
    Sec. 5.09. (A) In gassy mines:
    1. When the mine is to be operated he shall have the prescribed working places of such mine examined by a certified mine examiner within 4 hours before the workers of any shift, other than the examiner or the examiners designated by the mine manager to make the examination, enter the underground areas of such mine. Have the mine examiner inspect every active working place in the mine and make tests therein with a permissible flame safety lamp for accumulation of methane and oxygen deficiency in the air therein; examine seals and doors to determine whether they are functioning properly; inspect and test the roof, face and rib conditions in the working areas and on active roadways and travelways; inspect active roadways, travelways, approaches to abandoned workings and accessible falls in active sections for explosive gas and other hazards; and inspect to determine whether the air in each split is traveling in its proper course and in normal volume.
    2. On "non-coal producing shifts" he shall have the mine examined in its entirety the same as for a coal producing shift, except where persons are to work only in the shaft, slope, drift or on the immediate shaft or slope bottom, then only that area immediately surrounding the bottom shall be examined.
    3. He shall see that no person, other than competent personnel, enters any underground area in a gassy mine, except during a coal-producing shift, unless an examination of such area has been made by a mine examiner within 12 hours immediately preceding his entrance into such area.
    (B) In non-gassy mines:
    1. Have the underground areas examined by a certified mine examiner at least once in each calendar day during which coal is produced. Such examination shall be made within 4 hours immediately preceding the beginning of the first coal-producing shift on such day.
    2. On idle days, have all sections of the mine examined where men are to be required to work.
    3. On idle nights, when the mine has been examined for the day shift and the men are to work in sections previously examined and no coal is to be mined, no further examination shall be required.
    (C) One examination on each day when workers perform production or idle day work shall include the escape ways required by Sections 19.11 and 19.13.
(Source: P.A. 81-992.)