房柱法在二里河铅锌矿的典型应用

Typical Application of Room and Pillar Method in Erlihe Lead-zinc Mine

二里河铅锌矿Ⅱ1号矿体呈不规则的马鞍状,鞍部矿体厚大,难采,矿山曾采用底盘漏斗空场法进行试采,效果不理想。根据Ⅱ1号矿体开采技术条件,经过研究,推荐采用房柱法对鞍部厚大矿体进行回采,通过试采,损失率、贫化率及千吨采切比都明显降低,同时采用锚杆支护采空区顶板,有效控制了采空区坍塌。综合各种因素,房柱法适合Ⅱ1号鞍部矿体的回采。

The Ⅱ1 ore body in Erlihe Lead-zinc Mine looks like an irregular saddle. The ore body at saddle is so thick that it is very difficult to exploit. The open stoping method with footwall chute was adopted once in the mine,but had a non ideal effect. According to the mining technical conditions of Ⅱ1 ore body,the room and pillar method is recommended for the thick saddle-like ore-body. In the tests,the loss ratio,dilution ratio and mining-cutting ratio were all significantly declined. Meanwhile,the collapse of mined-out area was effectively controlled by using the anchor to support the roof. The room and pillar method is ideal for exploiting the saddle of Ⅱ1 ore body based on analyzing all influencing factors.