Dynamic-programming based model for phase-mining optimization in open-pit metal mines

GU Xiaowei; XU Xiaochuan; WANG Qing

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Dynamic-programming based model for phase-mining optimization in open-pit metal mines

GU Xiaowei *,XU Xiaochuan #,WANG Qing

Resources and Ecological Economics Research Center, Northeastern University, Shenyang 110004, China.

*Correspondence author

#Submitted by

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Funding: SRFDP（No.20090042120040）, National Natural Science Foundation of China（No.50974041）

Opened online:21 December 2012

Accepted by: none

Citation: GU Xiaowei,XU Xiaochuan,WANG Qing.Dynamic-programming based model for phase-mining optimization in open-pit metal mines[OL]. [21 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4503130

Three important aspects of phase-mining must be optimized: the number of phases, the geometry and position of each phase-pit (including the ultimate pit), and the ore and waste quantities to be mined in each phase. A model is presented in this paper in which, a sequence of geologically optimum pits are first generated and then dynamically evaluated to simultaneously optimize the above three aspects, with the objective of maximizing the overall net present value. The model takes into full account of the dynamic nature of the problem with respect to both time and space, and is robust in accommodating different pit wall slopes and different bench heights.

Keywords: open-pit; phase-mining; dynamic programming; optimization

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