关键词: 分段空场法, 分区回采, 回采率, 贫化率, 经济效益

Abstract: Jiling iron ore-body which belongs to Gansu Jinchang iron industry group is a gently inclined medium-thick ore body. The main mining method for it is sublevel stoping with its sublevel height of 10m and medium-length hole blasting. The ore recovery is about 50% and the dilution is about 29%, which have been maintained for many years. Research showed that there are many problems of the sublevel stoping process, such as large excavation volume of the footwall waste rock, large amount of ore drawing loss, and the top pillar can not be recovered etc. In light of the problems above, the sublevel stoping by step-stoping was applied in Jiling iron. The practice shows that the recovery can be increased from 50% to 68%～70%,and the dilution rate can be decreased from 29% to 17%～20%, so the economic benefits are greatly significant. The process provides a reference to the similar mine.

Key words: Sublevel stoping, Step stoping, Recovery rate, Dilution rate, Economic Benefits