67.—(1) Every person engaged at any working face (including a place in a road at which ripping or work of repair is in progress) or in setting or withdrawing supports shall make a careful examination of his working place at the beginning of each period of work and at appropriate times during the course of it and in particular after any shot has been fired thereat or near-by and after any other interruption of work. He shall remove or secure any loose part of the roof, face or sides at his working place which might be dangerous.
(2) Every person so engaged shall take any necessary steps to avoid interruption of the ventilation of the mine whether by accumulations of mineral, vehicles or stores.