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Phase Planning for Open Pit Coal Mines through Nested Pit Generation and Dynamic Programming

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  • Xiaowei Gu
  • Qing Wang
  • Xiaochuan Xu
  • Xiaoqian Ma

Abstract

This paper presents a phase planning method specially designed for coal deposits with nearly horizontal, bedded coal seams. The geology of this type of deposit is modeled into a column model, instead of a block model, to avoid coal-rock mixing in blocks. A nested pit generation algorithm is developed for producing a series of nested, least-strip ratio pits with a column model as its input. The algorithm completely overcomes the troublesome gap problem. Taking the least-strip ratio pits as possible phase states, a dynamic programming formulation is proposed to simultaneously optimize the number of phases, the phase-pits, and the ultimate pit, with an objective of maximizing the net present value. The merits and capability of the proposed method are demonstrated through a case study on a large coal deposit.

Suggested Citation

  • Xiaowei Gu & Qing Wang & Xiaochuan Xu & Xiaoqian Ma, 2021. "Phase Planning for Open Pit Coal Mines through Nested Pit Generation and Dynamic Programming," Mathematical Problems in Engineering, Hindawi, vol. 2021, pages 1-8, February.
    • Handle: RePEc:hin:jnlmpe:8219431
    DOI: 10.1155/2021/8219431
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