To pump a slurry of water and waste material, such as sand or mill tailings, into excavated underground voids. Once the water drains away, the remaining material forms a dense, compact mass that supports the surrounding rock. This method helps prevent surface subsidence and safely disposes of waste material that would otherwise require surface storage.
Heard on the job
After we pull the last pillars from that block, we'll flush the stope with cemented paste backfill to stabilize the ground.
Also heard as
- hydraulic backfill