预裂爆破技术在二台子金矿采矿方法中的应用

在二台子金矿的浅孔留矿采矿法中成功地使用了预裂爆破技术。该技术是沿矿体边界线设计一排较密集的预裂孔 ,预裂孔超前主爆孔起爆 ,从而沿矿体与围岩交界处形成整齐的预裂缝 ,大大地减少了围岩的混入 ,降低了矿石的贫化率指标 ,取得了良好的经济效益。

The application of the pre-splitting blasting in Ertaizi Gold Mine

The pre-splitting blasting technique was applied successfully in the short hole shrinkage mining method at Ertaizi Gold Mine.A line of close pre-splitting holes were designed along ore boundary and the pre-splitting holes blasted before the main blasting holes did .so a regular pre-splitting chink along the ore and rock juncture was formed and the rock misscellany ration and the ore dilutionration were largely reduced and the better economic profits were achieved.