马坑铁矿扇形中深孔的实践与应用创新

Innovational Application of Medium-length Hole Blasting During Actual Mining in Strike Mutation Ore of MA-Keng

马坑铁矿是国内著名的特大型磁铁矿床之一,经探明的铁矿石地质储量4.34亿吨,平均含铁品位37.99%。马坑铁矿生产规模从2013年到2016年实现了稳步增长,同时也逐步淘汰产量小、效率低的浅孔留矿法,发展和应用了规模化中深孔的采矿方法,也在中深孔的实践中,总结出了不少设计经验。文中对马坑铁矿井下走向突变矿体回采方案进行对比讨论,提出了多排炮孔一次毫秒微差爆破方案,其现场应用效果显著。

Makeng iron ore is one of the famous iron ore deposits in China,proved the geological reserves of 434 million tons of iron ore,with an average iron grade of 37.99%. The production scale of Ma-Keng has achieved steady growth from 2013 to 2016. At the same time,Ma-Keng iron ore from the of the shallow hole shrinkage method which is production of small, low efficiency, to the scale of the deep hole in the main mining method transformation. In this paper, we discuss the recovery plan of the mutated ore body, and put forward an effective blasting scheme for the application.