Backfill
Backfill is both the procedure and the material (filling material) for the backfilling of the still existing cavities or residual cavities during the final sealing phase in the post-closure phase of a repository mine.
Backfill is both the procedure and the material (filling material) for the backfilling of the still existing cavities or residual cavities during the final sealing phase in the post-closure phase of a repository mine.