A Two-Step Framework for the Open-Pit Mine Production Scheduling Optimization Under In-Pit Crushing and Conveying System

2021

Dingbang Liu

In-pit crushing and conveying (IPCC) systems have drawn attention to the modern mining industry. This material transportation technology has numerous benefits compared to conventional truck/shovel systems. However, the implementation of the IPCC system can reduce mining flexibility and introduce additional requirements. This presentation will discuss the open-pit mine production scheduling under different conveyor and crusher allocations. The applied methodology is divided into two steps. In the first step, different candidate conveyor routes accommodated in a set of dedicated ramp slots is investigated; a mixed-integer linear programming model is proposed to maximize the net present value (NPV) for each conveyor layout scenario. The optimum conveyor layout gives the maximum NPV over all scenarios. The second step is to determine the crusher location and relocation plan based on the conveyor route from the previous step; a facility location model is applied to minimize the total transportation cost. A clustering method is applied to reduce the computation size in the two-step calculation. Clusters' precedence relationship is defined based on the mining direction and vertical block precedence. The results indicate that the conveyor and crusher location can significantly impact the NPV and operating costs, which means the system should be carefully designed at the beginning of the mining stage.
Keywords: In-pit crushing and conveying; Production scheduling; ramp slot; Hierarchical clustering; Mixed-integer linear programming; Conveyor location
cim.paperattributes.header.paperkeywordsfrench: In-pit crushing and conveying; Production scheduling; ramp slot; Hierarchical clustering; Mixed-integer linear programming; Conveyor location
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