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    A new model for open-pit production and waste-dump scheduling

    Access Status
    Fulltext not available
    Authors
    Fu, Z.
    Asad, Mohammad Waqar
    Topal, Erkan
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Fu, Z. and Asad, M.W. and Topal, E. 2019. A new model for open-pit production and waste-dump scheduling. Engineering Optimization. 51 (4): pp. 718-732.
    Source Title
    Engineering Optimization
    DOI
    10.1080/0305215X.2018.1476501
    ISSN
    0305-215X
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/74506
    Collection
    • Curtin Research Publications
    Abstract

    An open-pit mine schedule defines the optimal sequence of mining valuable (ore) and waste material with the objective of maximizing the value of the project. Given this production schedule, a waste-dump schedule is then developed to determine the optimal waste-rock allocation in waste dumps. Thus, production and waste-dump schedules are managed separately, which leads to an inappropriate consideration of the material haulage cost, suboptimal schedules generating less value, and the incorrect classification of ore and waste. This article proposes a mixed-integer programming-based model that determines the optimal production and waste-rock dumping schedule concurrently with the objective of maximizing the discounted cash flow [net present value (NPV)] of the project. An implementation of the proposed model on a gold-mining operation outperforms the two existing methods [traditional and two-step mixed-integer programming (TSMIP) model] in the context of project NPV as well as its practicality.

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