北洺河铁矿深部矿体采场结构参数优化

北洺河铁矿为接触交代矽卡岩型磁铁矿床，应用无底柱分段崩落法开采，分段高度15 m，进路间距18 m。在上部矿体开采中一直沿用这一参数,取得了较好的技术经济效果。然而近年来，随着采深的增加，矿石损失率有增大的趋势，所以需重新确定深部矿体结构参数。为此，根据目前无底柱分段高度发展趋势，按照3分段回采原则以及有利于回收下盘残留矿量的原则，推荐东部厚矿体选取20 m的分段高度。根据重新测定的深部矿体散体流动参数以及分段高度与进路间距的关系式，计算得出20 m的分段高度能更好地适应目前18 m的进路间距，并提出了不同分段高度间的过渡方式。

Stop Structure Parameters Optimization of Deep Ore Body in Beiminghe Iron Mine

Beiminghe iron mine is a contact metasomatic skarn type magnetite deposit，and the sublevel caving mining method was adopted. The sublevel height is 15 m and the drift interval is 18 m. These parameters have been used mining the upper orebody，and better technical economical effect was obtained. With the mining depth increasing in recent years，the ore loss rate increase gradually，so the mine needed a new structure parameter. 20 m sublevel height based on trend of subleve development was recommended in this paper，the principle of mining using at least three subleve and the factor of beneficial to recovery residual ore on footwall. Based on calculation using a new measured granular media flow parameter，20 m sublevel is better than the 18 m drift interval. In addition，the transition way of different sublevel is put forward.