Abstract: The western ore-body of Chambishi Copper Mine has characteristics of broken ore and rock,bad stability,complicated hydrogeology,and poor mining conditions.The upward horizontal cut and fill method was primarily chosen.Combining with actual situation,the method was optimized twice to finally determine the approach of paste filling mining method for adoption.Combined with preliminary works such as mining ore and rock physical and mechanical properties test,engineering geological survey and stability evaluation,the layout and structure parameters were optimized twice,and then the classification and regionalization of surrounding rock,and the supporting work were carried out.The production results showed that the upward drift backfill mining method make the ore recovery rate increased from 50% to 80%,and the dilution rate reduced from 15% to 6% or below.With mining production capacity of 3000t/d,it can save or create economic value of $4.5 million for mine,and effectively solve the difficulty in gently inclined broken ore-body of the copper mine.

Key words: Gently inclined, Broken ore rock, Upward drift backfill mining, Paste filling