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露天矿山开采境界动态优化是将时间因素加入露采境界三维优化过程的一种新方法。该法首先按不同的边界品位方案对矿床模型进行优化参数属性赋值计算,形成一系列静态价值模型,运用动锥法及L—G法获得一系列初步优化结果,通过反算法将时间属性植入矿床块体模型,计算不同边界品位所圈境界的年现金流,经贴现获得净现值(NPV),比较NPV确定最优方案。以某大型铜矿为例,创建了地质模型,对不同边界品位模型进行了境界初步优化,通过进度计划软件(MineSched)对初步优化结果编排进度计划,成功将时间属性加入到矿床块体模型,进而计算各境界方案的NPV,经比较分析确定边界品位0.43的优化坑为最优境界。实践表明,境界动态优化方法克服了传统方法的弊端,为露采矿山真实最优境界的寻找开辟了一条新的途径。
Dynamic optimization of open pit mining is a new method to add the time factor into the 3D optimization process of open cut mining. The method first assigns the optimal parameter attribute assignment to the mineral deposit model according to different boundary grade schemes and forms a series of static value models. A series of initial optimization results are obtained by using the moving cone method and the L-G method. The time attribute is implanted Deposit block model to calculate the annual cash flow of different boundary grade circles, the net present value (NPV) is discounted, NPV is compared to determine the optimal scheme. Taking a large copper mine as an example, a geological model was created to initial optimize the different boundary grade models. The schedule was optimized for the initial optimization results by using the MineSched software. Time attributes were successfully added to the ore block model. And then calculate the NPV of each state program, through the comparative analysis to determine the optimum grade of the boundary grade of 0.43 for the best state. Practice shows that the dynamic optimization of the state overcomes the disadvantages of the traditional methods and opens up a new way for the search of the real world of the open mining.