关键词: 地下开采, 倾斜矿体, 边角矿, 分段崩落法, 回采方案

Abstract: When the I# ore body of Jingtieshan Mine extends downward， the dip angle changes from steep to inclined. If the mining and cutting projects are continued according to the mining method of the steeply inclined ore body， the triangle corner ores will be left on the upper or lower part of the ore body， which in turn leads to an increase in ore loss rate. In order to effectively solve the problem of difficult recovery of the ore body in the triangle area due to the dip angle reduction of the ore body， firstly， two types of mining schemes were proposed to arrange the reef drifts along the orebody trend and along the boundary， in which the reef drifts arrangement three different medium-deep hole-edge hole angle layout schemes of 15°，30°， and 45°. Then， the advantages and disadvantages of different mining schemes of four schemes were analyzed qualitatively from four aspects such as the accuracy requirements of the medium-deep hole， the adaptability of the medium-deep hole construction，the ore body condition adaptability and production efficiency qualitatively. Finally， integrate the production efficiency， construction adaptability， ventilation effect， engineering quantity， construction period and cost， etc.， the analytic hierarchy process （AHP） is used to construct the analytic optimization model for the hanging wall residual orebody of the inclined orebody mining scheme. The final evaluation values of the three schemes of sublevel drifts along orebody trend and along the orebody boundary scheme are calculated to be 0.213，0.201，0.198 and 0.388， respectively. The results show that sublevel drifts along the orebody boundary is the best mining program. The practice results show that the selected scheme in Jingtieshan Mine has achieved ideal results with significant economic benefits， and meet the mining demand of the inclined ore body. The above study results can provide useful reference for the mining of residual orebody under the similar mining conditions.

Key words: Underground mining, Inclined orebody, Corner ores, Sublevel caving method, Mining scheme