关键词: 协同开采, 平面分区, 采铁保钒, 空场法转崩落法

Abstract: The double-layered vanadium and iron orebodies at Qijiaojing Mine extend greater than 4 km along the strike and distribute approximately parallel.When exploiting the iron mine at footwall，the ore loss and dilution rates are high，and it brings great challenge for vanadium protection at hanging wall.The mining technical characteristics of two deposits include long orebody strike，parallel distribution，negative correlation of thicknesses，severe mine-out area threat.According to these conditions，a series of methods were carried out to propose the synergetic mining of two deposits.These methods contained plane partition， mining sequence programming，mining method optimization and regional stability control.Practically，two orebodies were partitioned into eastern，western and central areas along the long strike according to their morphological characteristics，especially noted that the iron deposit was thick at central section and thin at both sides，while the vanadium deposit distributed on the contrary.In engineering space，the double-layered deposits used a same exploiting，preparation and haulage system. In mining sequence，the scheme provided a flexible mining schedule of vanadium deposit when ensuring the iron capacity expansion.In mining methods，stage open stoping with subsequent slightly paste backfill was proposed at eastern and western areas， and stage open stoping and sublevel caving was proposed at central area.Moreover，regional stability was controlled in and after mining with roof and hanging wall rock caving at central area，and paste backfill at eastern and western areas.The study results show that designed iron mining reserve increased 10 647 kt after the introduction of synergetic mining scheme， solid wastes such as rocks and tailings consumed more than 0.86 Mt in paste backfill.The synergetic mining was advantageous for safety and economic benefits.

Key words: Synergetic mining, Plane partition, Vanadium reservation when iron mining, Stage open stoping with subsequent sublevel caving