An area that is not sealed shall be ventilated. Return air may be used to ventilate the area. The department shall approve a ventilation plan for an abandoned, unused or sealed part of a mine.
52 P.S. § 690-235
An area that is not sealed shall be ventilated. Return air may be used to ventilate the area. The department shall approve a ventilation plan for an abandoned, unused or sealed part of a mine.
52 P.S. § 690-235