Study and Practice of Pillar Stoping of Shitouzui Copper and Iron Ore

The pillar stopng of Shitouzui copper and iron ore faces a series of technical problems.The key to solve is the success on the test and application by low sublevel open stoping with subsequent backfilling method,which has laid a reliable foundation for the mine continuous safe,efficient,low cost and low losses depleted stable production;3D numerical simulation analysis showed that the stoping order should be from top to bottom,from the central to both ends;it uses the low sublevel open stoping with subsequent backfilling first,then transitions to the high when conditions are ripe;the upper and lower middle stoping pillars should be aligned;before the goaf water threat of-220m above relieved,it should adopt the lower middle stope pillars and then the upper one first or the low part of the upper middle pillars only for the moment.The study has played an important guiding role in the mining area pressure control,flood prevention and safety production.