关键词: 无底柱分段崩落法, 双进路, 分流出矿, 损失贫化控制

Abstract: Gently inclined medium-thick ore body as a kind of hard-to-caving ore body has perplexed mineral engineering technicians for a long time.The pillarless sublevel caving with its advantages of safety，efficiency and adaptability can better explore this type of ore body.However，this method has problems of high footwall ore loss and dilution which usually affects its application.To solve this problem，under the background of caving gently inclined medium-thick ore body in Chambishi Copper Mine and based on the diversion effect of draw-point from stochastic medium theory of ore-drawing，a divided-flow drawing technology scheme with double drifts was put forward.In order to verify the feasibility of the scheme，ore drawing model was firstly established in the laboratory.Then according to the difference of drifts drawing sequence，three kinds of drawing scheme were designed.The experiment results show that the recovery indicators were better when drawing from the drift farther away from ore body.According to the laboratory experimental results，industrial tests were carried out in No.5 stope at 408 meters' level of Chambishi Copper Mine.In the tests，the recovery ratio was increased by 9.34%，and dilution ratio was decreased by 0.36%，so the experimental effect was very remarkable.

Key words: Pillarless sublevel caving, Double drifts, Divided-flow drawing, Loss and dilution control