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(a) Except as provided in subsection (b) of this section, no primary blasting shall be done in a mine during the working shift, except where the ventilating currents are arranged so that dust, smoke, and gases from the blast go out of the mine without circulating through any active working place.
(b) Where it is necessary to do primary blasting during the working shift and the ventilating currents pass from the blast area through active mine workings, all employees shall be removed from such workings to the fresh air side of the blast area before the shots are fired.
(c) After a blast, employees shall not be required or permitted to return to their working places until the atmosphere of such places is reasonably free of smoke, dust, and gases from the blast.
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