Study on Efficient Mining Method and Stope Structure Parameter Optimization in Gacun Silver Polymetallic Ore
The upward horizontal layered mining method is used in Gacun silver polymetallic ore.However,with the gradual deepening of mining depth and the change of the occurrence state of the surrounding rock of the ore body,it is urgent to explore safer and more efficient mining methods to improve the economic benefits of mining.According to the mining technical conditions of the silver-lead-zinc-copper ore body in the middle section of 3 900 m,the upward horizontal layered filling mining method and the downward medium-deep hole sublevel filling mining method were proposed.The safety,dilution rate,loss rate,mining-cutting ratio and comprehensive production capacity of the two mining methods were comprehensively analyzed.Finally,the downward medium-deep hole sublevel filling mining method was selected.At the same time,the stope segmentation parameters were optimized by numerical simulation.The optimal segmentation scheme is obtained:the stage is divided into three segments,and the height of the segments are 18 m,16 m and 16 m respectively from top to bottom.At this time,the maximum displacement of the surrounding rock on the hanging wall is 94.11 mm,and the overall displacement of the surrounding rock in the goaf is within 50-100 mm.There is no obvious penetration failure in the plastic zone inside the filling body.
万方数据
维普
