The aanaue-backfillina hvdraulic support for coal seam extractioris suitable for coal seams with interbedded ganque. lt allows folthe extraction of the coal layer above the gangue firstllowed byreverse operation of the face conveyor to extract the middlegangue layer. The gangue is then transported to the goaf via aseparate transfer conveyor. Additionally, gangue from other working faces can also be backfilled into the goaf. This achieves enyironmentally friendly coal mining by keeping gangue undergroundwhile simultaneously improving mining efficiency and reducincproduction costs