SECONDARYBOULDERBREAKING矿石二次爆破Secondarybreakinginsurfaceminesandquarriesoccurswhereoversizerocksareproducedfromaprimaryblastthatneedtobereducedtoamanageablesizeforloadingandcrushing.Inpracticemosthard-rocksurfaceminesandquarrieswouldexpecttore-blastorbreakupto5%oftheirrockaftereffectiveprimaryblasting.露天矿场和采石场的二次爆破，指的是发生在初次爆破后，那些体积过大的岩石需要再分解到可运输和压制的状态。在实践中，大多数出产硬质岩石的矿场和采石场，希望能有再次爆破，或者更为有效的初次爆破使他们出产的矿石体积分解至原体积的5%。Therearehiddencostsassociatedwithoversizeresultingfromamassblastusingconven
