海南铁矿倾斜中厚矿体开采方案优化研究

Study on Mining Scheme Optimization of Inclined Medium-thick Orebody in Hainan Iron Mine

海南铁矿保秀矿区的矿体为矿岩稳定性较差的倾斜中厚到厚矿体,采用无底柱分段崩落法开采,设计垂直矿体走向布置回采进路,生产探矿揭露矿体分支复合严重,分支矿体的厚度及角度变化较大,垂直矿体走向布置回采进路导致较大的采准工程量和预计较高的矿石损失与贫化。因此,提出沿脉布置回采进路的采场结构的优化方案。与原设计方案相比,优化后下盘矿石损失率可降低10.91个百分点,采准工程量可节省28.4%。在充分利用矿山现有工程的基础上,以分段双进路采场结构为主合理回采下盘矿量,同时诱导上盘不稳围岩及时冒落。优化的开采方案可较好地适应矿体产状与厚度的变化,显著提高矿床开采的经济效益。

The orebody in Baoxiu mining area of Hainan Iron Mine is an inclined one with thickness from medium-thick to thick and poor stability,which is mined by sublevel caving without sill pillar.The stoping roadway was arranged perpendicular to the orebody strike.Considering that the occurrence of ore body revealed by production exploration was complex and the thickness and angle of the branching orebody was great,its previous arrangement leaded to large amount of preparatory engineering and high expected loss dilution rate.Thus,the stoping roadway parallel to the strike of the orebody was proposed.Compared with the original design,the ore loss rate of footwall can be reduced by 10.91 percentage points after the optimization,and the amount of mining engineering can be saved by 28.4%.On the basis of making full use of the existing engineering of the mine,the stope structure with sublevel double approach was adopted to recover the footwall ore reasonably and to induce the unstable surrounding rock of the hanging side to cave in time.The optimized mining scheme can better adapt to the change of orebody occurrence and thickness and significantly improve the economic benefit of mining.