 The concentrate is removed for further treatment while the tailings are discharged down a sluice at the stern of the dredge.The oversize from the trommel screen is passed to a conveyor mounted on a moveable arm at the stern of the dredge (normally called a stacker) and deposited behind the dredge.Traditionally, it is not rehabilitated but at Nettle Creek it is a requirement that the tailings be levelled and covered with topsoil, thereby restoring the dredged area to near its original state.