Section 732. Shafts Abandoned After Effective Date of This Act.--(a) Every shaft permanently abandoned after the effective date of this act shall be filled for its entire depth.
(b) Every slope, drift or tunnel permanently abandoned after the effective date of this act shall be filled for a distance of twenty-five feet with incombustible materials.
(c) All drillholes and boreholes, permanently abandoned after the effective date of this act, shall be effectively plugged or sealed with concrete.