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Semi-symmetrical production scheduling of an orebody for optimizing the depth of transitioning from open pit to block caving

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  • Khaboushan, A.Soltani
  • Osanloo, M.

Abstract

A combination of open pit (OP) and underground (UG) mining methods may be applied for extraction of large scale orebodies. Although the optimization of production scheduling of each of these methods has been addressed separately, the simultaneous optimization of the whole mining operations has less been studied. However, such overall optimization strategy may enhance the net present value (NPV) of the adventure, determine the optimum transition depth (OTD), and help to manage natural resources accurately. This paper aims to determine an OTD between OP and block caving (BC) mining methods while scheduling an orebody entirely. In this regard, a semi-symmetrical integer programming (IP) model has been developed and implemented on a real orebody. The numerical results indicate that the OTD locates 10 m above the original OP bottom. By considering this level as the optimum separating limit of OP and UG mining operations, the NPV of the whole project will increase by up to 0.28%. Through the study, the definition of transition zone has been clarified and the transition capability has been introduced as a new term in mining literature.

Suggested Citation

  • Khaboushan, A.Soltani & Osanloo, M., 2020. "Semi-symmetrical production scheduling of an orebody for optimizing the depth of transitioning from open pit to block caving," Resources Policy, Elsevier, vol. 68(C).
    • Handle: RePEc:eee:jrpoli:v:68:y:2020:i:c:s0301420720301537
    DOI: 10.1016/j.resourpol.2020.101700
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    References listed on IDEAS

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    1. King, Barry & Goycoolea, Marcos & Newman, A., 2017. "Optimizing the open pit-to-underground mining transition," European Journal of Operational Research, Elsevier, vol. 257(1), pages 297-309.
    2. Daniel Espinoza & Marcos Goycoolea & Eduardo Moreno & Alexandra Newman, 2013. "MineLib: a library of open pit mining problems," Annals of Operations Research, Springer, vol. 206(1), pages 93-114, July.
    3. Alexandra Newman & Candace Yano & Enrique Rubio, 2013. "Mining above and below ground: timing the transition," IISE Transactions, Taylor & Francis Journals, vol. 45(8), pages 865-882.
    4. Whittle, D. & Brazil, M. & Grossman, P.A. & Rubinstein, J.H. & Thomas, D.A., 2018. "Combined optimisation of an open-pit mine outline and the transition depth to underground mining," European Journal of Operational Research, Elsevier, vol. 268(2), pages 624-634.
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    1. Chung, Joyce & Asad, Mohammad Waqar Ali & Topal, Erkan, 2022. "Timing of transition from open-pit to underground mining: A simultaneous optimisation model for open-pit and underground mine production schedules," Resources Policy, Elsevier, vol. 77(C).

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