浅谈鑫城金矿露天转地下开采问题

鑫城金矿属高品位、急倾斜、椭圆形柱状矿体，矿石不稳固，矿岩界限不清。露天转地下开采后应用空场采矿法开采，致使预留的护顶矿柱冒落，采场与露天坑相通，露天边坡大量冒落的废石混入已采下矿石造成严重贫化。为此，重新确定适应该矿体开采的采矿方法，安全生产，减小贫化，提高效益成为矿山的当务之急。文中针对露天转地下开采问题进行了分析研究，并介绍了推荐方案的主要特征。

Preliminary discussion on the change of mining technique from open pit mining to underground mining in Xincheng Gold Mine

The orebody of Xincheng Gold Mine is elliptical columnar high-grade orebody with high inclination degree. The ores are instable,and the boundary between rock and gold ores is not distinct. After the mining method is changed from open pit mining to underground mining,the openstope method is used,resulting caving of reserved orepillar. In this case,the stope is connected with the open pit,making large amount of spoils around the slope of the open pit to drop into the mined ores. Therefore,the most important is to find a more suitable mining method,so as to decrease the depletion of ore grade,improve the benefits and assure the safety of production. The paper analyzed this problem,and introduced characteristics of recommended programme.