ABSTRACT

Simultaneous stochastic optimisation manages risk and capitalises on the unique interactions that occur in a mining complex, where materials are transferred between mines, processors, stockpiles, and waste facilities to achieve a marketable product. Typically, when optimising the production schedule, the primary focus is to deliver valuable products to the market. However, this tends to ignore the environmental and economic impact of simplifying waste management requirements, including the storage and disposal of waste material. Stricter regulations and engineering requirements are transforming past mining practices to develop more sustainable operations. These transformations increase the financial cost of waste management and identify the requirement to integrate waste management into the production schedule. Additionally, misrepresenting the material uncertainty and variability associated with the amount of waste produced can impact, both, the stakeholders and the profitability of a mining complex. In this case study, a simultaneous stochastic optimisation approach is applied in a gold mining complex that integrates waste management into the long-term production schedule. The resulting schedule leads to a 6% increase in the net present value when compared to a conventional approach, while minimising the likelihood of deviating from production targets and ensuring permit constraints are satisfied.

摘要

同时随机优化管理风险并利用采矿综合体中发生的独特交互作用，在该综合体中，物料在矿山，加工商，库存和废物设施之间转移，以实现可销售的产品。通常，在优化生产进度时，主要重点是向市场提供有价值的产品。但是，这往往会忽略简化废物管理要求（包括废物的存储和处置）对环境和经济的影响。更严格的法规和工程要求正在改变过去的采矿实践，以发展更具可持续性的运营。这些转变增加了废物管理的财务成本，并确定了将废物管理纳入生产计划的要求。另外，虚假陈述与产生的废物量相关的物质不确定性和可变性会影响利益相关者和采矿综合体的盈利能力。在本案例研究中，同步随机优化方法应用于金矿综合体，该综合体将废物管理纳入长期生产计划。与常规方法相比，最终的进度计划使净现值增加了6％，同时最大程度地降低了偏离生产目标的可能性，并确保满足许可约束条件。同时随机优化方法应用于金矿综合体，该综合体将废物管理纳入长期生产计划。与常规方法相比，最终的进度计划使净现值增加了6％，同时最大程度地降低了偏离生产目标的可能性，并确保满足许可约束条件。同时随机优化方法应用于金矿综合体，该综合体将废物管理纳入长期生产计划。与常规方法相比，最终的进度计划使净现值增加了6％，同时最大程度地降低了偏离生产目标的可能性，并确保满足许可约束条件。