铅硐山铅锌矿井下核部矿体桃心矿柱人工假底替换试验研究分析与应用OA

The core ore body is located in the contact zone between the core limestone and phyllite of the Lead Cave Mountain anticline.The western part of the ore body is composed of phyllite,which is moderately stable;The north,south,and east parts of the ore body are all composed of limestone,which is stable.The geological reserves of Taoxin ore pillar are 10308 tons,with lead grade of 7.56%,zinc grade of 16.32%,and comprehensive grade of 23.88%.The commonly used mining method is the segmented open pit method for backfilling.The mining room is first mined,and then the mining pillars are recovered.The recovery rate of the mining pillars is 48%to 70%,and the loss rate is relatively high.In order to improve the recovery rate of the mining pillars and ensure the effective recovery of high-grade ore,considering the overall ore allocation in the underground mining area and improving economic efficiency,it is proposed to use artificial false bottom technology to replace the Taoxin mining pillars.The Taoxin mining pillars will be mined in sections with layered full section retreat,and the pillars will be replaced with concrete or mortar rubble.