(1)In every gassy mine, the precautionary measures as specified in sub-regulations (2) to (7) shall apply.(2)No working or gallery shall be extended to a distance of more than 3 meters from the nearest ventilation connection unless the current of air is coursed up to a point within 3 meters of the face by means of fire resistant pipes, tubes, brattices or other material.(3)No narrow main or advance gallery shall be driven more than three meters ahead of the widened gallery.(4)Every stopping between the main intake and the main return airway shall be substantially built and every air-crossing shall be so constructed and maintained as to withstand the force of an explosion.(5)The main air current shall be so split and coursed that an air current which ventilates a goaved out area, whether packed or unpacked, or any disused workings shall not, except with the prior permission in writing of the Regional Inspector and subject to such conditions as he may specify therein, ventilate any workings where coal is being extracted.(6)No major alteration shall be made in the system of ventilation except with the prior permission in writing of the Regional Inspector and subject to such conditions as he may specify therein:Provided that where the safety of the mine or of the persons employed therein is seriously threatened, the provisions of this sub-regulation shall be deemed to have been complied with, if information of such alteration is sent to the Regional Inspector forthwith.(7)Except in an emergency, when a major alteration is made in the system of ventilation, only such persons as are engaged in making the alteration shall be present belowground.
