Abstract: When the medium-thick ore-body is mined by depressurized mining method, it is not only to consider the depressurized effect, but to consider its mining technical and economic index. The influence factors of depressurized mining are analyzed, and the relationship between mining parameters and waste rock mixed rate is established according to the stope structure layout of depressurized mining. Then the applicable condition for medium-thick ore-body depressurized mining is ensured based on the permitted technical and economic index of mining, and the influence of stope structure parameters on technical and economic target is discussed. Based on the research above, a reliable way for determination of applicable condition for depressurized mining of medium-thick ore-body and the parameters optimization of the depressurized mining is provided.

Key words: Medium-thick ore-body, Depressurized mining, Technical and economic index, Applicable condition