Optimization of Cut-off Grades for Molybdenum and Tungsten Open-pit Mines

Resources Environment & Engineering Pub Date : 2017-01-01 DOI:10.15273/GREE.2017.02.004

Qinghua Gu, Jin Yuan, Yichuan Lv, Qiong Wu, Caiwu Lu

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Abstract

The cut-off grade is one of the important parameters of mining production. Different material cut-off grade is directed to different destinations. Based on reasonable and optimal cut-off grade, long term mining plan and investment decision analysis can be made for mining managers. In view of multiple-metals open-pit, the paper has proposed that multiple-metals cut-off grade optimization model is set using the objective function to maximize net present value (NPV). The method of equivalent coefficient calculation is proposed to convert multi-metals cut-off grade optimization to a single metal cut-off grade optimization. Then the optimization model is applied in a molybdenum and tungsten large open-pit mine in china. The parameters of concentrate price are calculated by PRT in the model and the curve of grade-recovery rate is analyzed and studied according to actual production data. Based on 3D metal deposit model, the distribution of grade-tonnage is analyzed. At final step, an optimal cut-off grade is proposed to guarantee to maximize NPV. The example shows that the model of multiple-metals cut-off grade optimization can provide reasonable analysis for optimal multi-metals cut-off grade and develop optimal production strategies.

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钼钨露天矿截止品位优化

截止品位是矿山生产的重要参数之一。不同的材料截止等级被导向不同的目的地。根据合理、最优的边界品位，为矿山管理者制定长期开采计划和投资决策分析。针对多金属露天矿，提出以净现值(NPV)最大化为目标函数，建立多金属品位边界优化模型。提出了将多金属边界品位优化转化为单金属边界品位优化的等效系数计算方法。并将该优化模型应用于国内某大型露天矿。利用模型中的PRT计算精矿价格参数，并根据实际生产数据对品位—回收率曲线进行分析研究。基于三维金属矿床模型，分析了品位-吨位分布。最后，提出了保证NPV最大化的最优截止等级。实例表明，多金属边界品位优化模型可为多金属边界品位优化提供合理分析，制定最优生产策略。

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Resources Environment & Engineering

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