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露天矿山开采境界圈定的合理性与矿山效益直接相关,为科学、简便的得到最优露天开采境界,借助三维数字矿床模型,结合NPV原理,采用L-G图论法,充分考虑贴现率、矿石的不同品级售价及不同岩石类型比重等现实情况,利用块段模型属性运算,以采剥进度计划所得各块段采剥年度值,计算块段净现值,以净现值为优化目标,做出投资方案评价,实现露天开采境界动态最优化计算。以某铁矿为例进行了动态优化计算,最终优化结果相较境界初始解,采剥总量减少210.4万m3,平均剥采比由2.25减小到1.52,效果明显。
The reasonableness of the delineation of the open pit mining is directly related to the mine benefit, and the optimal open pit mining is obtained scientifically and conveniently. With the 3D digital deposit model and the NPV principle, the LG graph theory method is adopted to take full account of the discount rate and the different ore Grade price and the proportion of different types of rock and other realities, the use of block model attribute operation to mining stripping progress plan of each block mining peel annual value, calculate the block net present value, with the net present value as the optimization goal, make Investment program evaluation, to achieve the dynamic optimization of open-cut mining state. Taking a certain iron mine as an example, the dynamic optimization calculation is carried out. Compared with the initial solution, the final result of optimization is reduced by 2.14 million m3 and the average stripping ratio is reduced from 2.25 to 1.52.