露天矿生产规划要素整体优化方法及其应用

Holistic Optimization of Production Planning Elements and Its Application for Open-Pit Mine

以剥采比最大境界为基础,使用锥体排除法,逐步排除满足增量大小且平均品位最低的部分,得到一系列地质最优境界和对应境界的地质最优开采体序列.使用动态规划法得到每个境界的生产计划,从中选出净现值最大的境界作为最优境界,该境界的最佳开采路径作为最优开采方案,实现露天矿境界同生产计划整体优化.对上述算法进行软件开发和实例应用.结果表明,成本及价格保持不变条件下,整体优化最佳规划方案的采剥量及NPV比最大盈利境界分别小42.4%和大17.0%;成本及价格分别上升2%和3.5%条件下,整体优化最佳规划方案的采剥量及NPV比最大盈利境界分别大55.0%和6.0%.

Based on the biggest stripping ratio pit, cone elimination method was used to gradually remove the parts which satisfy the increment size while the average grade of removed parts was lowest. In this way, a sequence of geologically optimum pits and push-backs could be obtained. Dynamic programming was used to generate optimum production planning of each pit, based on which the largest NPV was chosen as optimum pit and the best mining path was further chosen as the optimal production design, thus realizing the simultaneous optimization of the pit and production design. The algorithm was programmed and applied on engineering project. The results show that, under the condition of costs and prices remaining the same, ore and waste quantities of the best plan in the holistic optimization are less than 42. 4% of the biggest profit pit while the NPV of the former is 17.0% above the latter. As costs and prices rising by 2% and 3.5% , respectively, ore and waste quantities of the best plan in the holistic optimization are more than 55.0% of the biggest profit pit while the NPV of the former is 6.0% above the latter.