缓倾斜破碎矿床上向进路膏体充填采矿技术

谦比希铜矿西矿体矿岩破碎、稳固性差,水文地质条件复杂,开采技术条件差,初选上向水平充填采矿法,矿山结合实际情况,进行了2次工艺优化,最终确定采用上向进路膏体充填采矿法进行回采。结合矿山矿岩物理力学性质试验、工程地质调查和稳定性评价等前期工作,先后2次在此基础上对采场布置方式、结构参数进行优化,开展了采场围岩分级分区和支护等工作。现场生产表明:采用上向进路膏体充填采矿后,矿石回收率从原有的50%提升至80%,贫化率从15%下降到6%以下,采矿生产能力达3 000 t/d,每年为矿山节省或创造450万美元经济价值,有效解决了该矿山缓倾斜破碎矿床开采难的问题。

Upward Drift Paste Backfill Mining Technique in the Gently Inclined and Broken Ore Deposit

The western ore-body of Chambishi Copper Mine has characteristics of broken ore and rock,bad stability,com-plicated hydrogeology,and poor mining conditions. The upward horizontal cut and fill method was primarily chosen. Combining with actual situation,the method was optimized twice to finally determine the approach of paste filling mining method for adop-tion. Combined with preliminary works such as mining ore and rock physical and mechanical properties test,engineering geolog-ical survey and stability evaluation,the layout and structure parameters were optimized twice,and then the classification and re-gionalization of surrounding rock,and the supporting work were carried out. The production results showed that the upward drift backfill mining method make the ore recovery rate increased from 50% to 80%,and the dilution rate reduced from 15% to 6%or below. With mining production capacity of 3000t/d,it can save or create economic value of $4. 5 million for mine,and ef-fectively solve the difficulty in gently inclined broken ore-body of the copper mine.