The accident had occurred unexpectedly that the tailings outpoured from the gab during the gob hydraulic fill in Dongguashan copper mine.

• 冬瓜山铜矿东山采空区全尾砂充填过程中,发生尾砂泄漏事故,经事故原因分析,查处尾砂泄漏点,采用高压旋喷注浆技术堵水,结果表明治理效果很好。