Section 281. Sealing openings.
(a) Permanently abandoned shafts.--Every shaft permanently abandoned shall be filled for its entire depth. The fill shall extend from the bottom of the coal seam to a height of 50 feet with incombustible material.
(b) Out of service openings.--Every slope, drift or tunnel permanently taken out of service shall be filled for a distance of 25 feet with incombustible material.
(c) Drillholes and boreholes.--All drillholes and boreholes permanently taken out of service after the effective date of this act shall be effectively plugged or sealed.
(d) Openings available for future use.--Every shaft, slope, drift or tunnel, temporarily taken out of service, which may be used for future mining purposes shall be properly sealed or fenced.