bau ite mining open pit procedure
MAIN PIT BACKFILLING CONCEPT APPROACHES, RUM Figure 23 Pit schematic of idealized pit shell at the end of mining and current inpit materials Figure 24 Photo of the open cut taken during mining in 1958 Figure 25 View of the pit model showing the backfill cone in the north Figure 26 Photo showing softened rock in the wetted zone of the pit walls Figure 31 Approach 1 schematic