基于三维仿真和动态评估的露天矿采剥顺序优化

Open Pit Mining-stripping Sequence Optimization Based on 3D Simulation and Dynamic Evaluation

矿石品位分布无序,导致矿山不同采剥顺序所得经济效益差别很大,为获得优越的矿山排产方案,提出了基于三维仿真和动态评估的露天矿开采顺序优化方法。利用三维仿真技术实现复杂露天矿山矿岩多层次约束的动态开挖,获得每年矿岩采剥量及出矿品位。根据矿山总图布置、采剥位置和发展方式计算矿岩运距,进行矿山设备选型,进而估算矿山基建投资,在矿产品预测售价基础上计算各方案净现值,经比较确定最优开采顺序。以某大型钼矿为例,在矿业软件Surpac中创建了地质块体模型并进行品位估算和价值参数赋值,然后通过矿石售价折扣方式获得系列嵌套境界方案,根据矿山实际条件,借助MineSched软件通过多种约束手段对采剥方案进行排产,运用经济动态评估方法确定了最优采剥方案。

The disorder distribution of ore grade leads to different economic benefits caused by different stripping order.In order to obtain superior mine scheduling scheme,the paper proposed a mining sequence optimization method based on 3D simulation and dynamic assessment.By 3D simulation,the dynamic excavation of complex open mine under multi-level constraints was realized,and excavation quantity and grade of ore were obtained.According to mine general layout,stripping position and development,the calculation of transport distance,equipment selection,and infrastructure investment evaluation were carried out.And then combining the mineral advance price,the net present value of each scheme models was calculated.And finally the best optimization scheme through comparing NPV was determined.Take one molybdenum mine as example.First create a geological block model in the Surpac,and then assign the mine grade and value to the model,finally obtain series nest limit schemes by discounting price.According to the actual mining conditions,using MineSched software,the mining-stripping schemes were scheduled through various constraint means,and the optimal scheme was determined by applying the dynamic economic assessment.