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滨海硼生产联合公司各露天矿用2-200和-250MHA-32型牙轮钻机分别钻进直径为215和250mm的炮孔。用这种直径的炮孔进行爆破时对附近居民区产生地震危险,而且大块率也很高。
Binhai B Production Joint Venture each open-pit 2-200 and -250MHA-32-type cone drill were drilled into 215 and 250mm diameter holes. Blasting with such diameter blast holes creates a seismic risk to nearby residential areas and the bulk rate is also high.