Development of An Integrated Mathematical Model to Optimize Waste Rock dumping Satisfying Environmental Aspects

IF 1.1 Q3 MINING & MINERAL PROCESSING
T. Ramezanalizadeh, M. Monjezi, A. Sayadi, A. Mousavinogholi
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引用次数: 2

Abstract

Waste rock dumping is very important in the production planning of open-pit mines. This subject is more crucial when there is a potential of acid-forming (PAF) by waste rocks. In such a type of mines, to protect the environment, the PAF materials should be encapsulated by non-harmful rocks. Therefore, block sequencing of the mined materials should be in such a way that both the environmental and economic considerations are considered. If non-acid forming (NAF) rocks are not mined in a proper time, then a stockpile is required for the NAF materials, which later on would be re-handled for encapsulation of PAF rocks. In the available models, the focus is on either block sequencing or waste dumping strategy. In this work, an attempt has been made to develop an integrated mathematical model for simultaneous optimization of block sequencing and waste rock dumping. The developed model not only maximizes the net present value (NPV) but also decreases the destructive environmental effects of inappropriate waste dumping. The proposed model, which is solved by a CPLEX engine, is applied to two different iron deposits. Also the performance of the proposed model is cross-checked by applying the available (traditional) models in a two-step manner. According to the results obtained, it can be considered that utilizing the developed model, because of extensive re-handling cost reduction, the NPV improvement is significant, especially when the overall stripping ratio is higher (deposit case A).
满足环境要求的废石倾倒优化综合数学模型的开发
废石排土场在露天矿生产规划中占有重要地位。当废石有可能形成酸(PAF)时,这个问题就显得尤为重要。在此类矿山中,为了保护环境,PAF材料应采用无害岩石包埋。因此,开采材料的块排序应同时考虑到环境和经济方面的考虑。如果没有在适当的时间开采非酸形成(NAF)岩石,则需要储存NAF材料,稍后将重新处理以封装PAF岩石。在现有的模型中,重点是块排序或废物倾倒策略。在这项工作中,试图建立一个同时优化块体排序和废石倾倒的综合数学模型。所建立的模型不仅使净现值(NPV)最大化,而且减少了不当倾倒废物对环境的破坏性影响。该模型由CPLEX引擎求解,并应用于两种不同的铁矿床。此外,通过以两步的方式应用可用的(传统)模型来交叉检查所提出模型的性能。根据得到的结果,可以认为利用所建立的模型,由于大量的再处理成本降低,NPV的改善是显著的,特别是当整体剥离比较高时(矿床情况A)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Mining and Environment
Journal of Mining and Environment MINING & MINERAL PROCESSING-
CiteScore
1.90
自引率
25.00%
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