Abstract: A large number of top and bottom pillars were left in the stoping process of a copper mine.Sublevel open stoping with backfilling method was used to recover high quality ore that remained in the top and bottom pillars safely and reduce the loss.The sill pillar was replaced by the backfill body with high strength,and the artificial bottom was laid as the roof of the next stage.Based on the condition of mine production,the study on the method of sill pillar replacement was carried out to determine the means and parameters in the formation of the replacement space.The reinforcement of the concrete was calculated in theory,and the specific laying process of the rebar was put forward.The method had been successfully applied in the mine,and can be used as reference for similar mines.

Key words: Sublevel open stoping with subsequent cementing and backfilling method, Sill pillar replacement, Artificial bottom, Reinforcement calculation