Abstract: With the rapid growth in fertilizer demand,it is particularly important to improve the recovery of high grade,and high quality phosphate.Yichang phosphate ore is in high grade,and belongs to the gently inclined thin ore.The current mining method results in the loss rate of ore pillar by 25% to 30%.To solve the problem of excessive loss rate,the scheme of artificial pillar substituting the original ore pillars is proposed.Based on the comparative analysis on the bearing capacity and stability of artificial pillar and ore pillar,the compressive strength of artificial pillar under different pillar distribution forms was obtained.The on-site implementation indicated that the scheme of artificial concrete pillar substituting the ore pillar ensured security of the stope after replacement,and significantly improved the recovery rate of the ore.

Key words: Artificial pillar, Structural size, Pillar strength, Ore extraction rate