(1)The roof and sides of all working places and travelling roadways, including airways and travelling road-ways to second outlets, shall be made and kept secure.(2)Proper provision shall be made to prevent premature collapse of working; and adequate steps shall be taken to isolate, control or remedy any such collapse which may occur.(3)Whenever crush of pillars or any symptom of an impending collapse other than ordinarily caused by pillar extraction is detected, the manager shall inform the Regional Inspector forthwith.
