When the mine is to be operated, he shall have the prescribed working places of such mine examined by a certified mine examiner within 3 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 multi-gas detector for accumulation of methane and oxygen deficiency in the air therein; examine intake seals used to ventilate a working section 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 worki
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When the mine is to be operated, he shall have the prescribed working places of such mine examined by a certified mine examiner within 3 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 multi-gas detector for accumulation of methane and oxygen deficiency in the air therein; examine intake seals used to ventilate a working section 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, if the mine has a minimum of 120 psi seals, he shall have the mine examined by a certified mine examiner in any area where any person is scheduled to work or travel underground. If the mine has less than 120 psi seals, he shall have the mine examined by a certified mine examiner 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. If the mine has a minimum of 120 psi seals and the mine has not been examined in its entirety for 7 consecutive days, he shall have a certified mine examiner conduct a full mine examination, including seals and escape ways, prior to anyone other than the mine examiner or mine examiners designated by the mine manager to make the examination enter the underground areas of such mine. If it is known that the air downwind of a minimum 120 psi seals 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, air analysis, or other recognized means of accurately detecting such gas, 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, or 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 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. 4. If the mine has constructed a minimum of 120 psi seals, he shall have a certified mine examiner conduct weekly examinations at each seal along return and bleeder air courses and at each seal along intake air courses where intake air passing by the seal is not used to ventilate a working section. If the mine has constructed less than 120 psi seals, he shall have a certified mine examiner conduct a daily examination of each seal along return and bleeder air courses. If it is known that the air downwind of a minimum 120 psi seals 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, air analysis, or other recognized means of accurately detecting such gas, he shall have each seal along return and bleeder air courses and at each seal along intake air courses where intake air passing by the seal not used to ventilate a working section to be examined by a certified mine examiner 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. 5. He shall have a certified mine examiner conduct weekly examinations of escape ways required by Sections 19.11 and 19.13.