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    Optimal production scale of open pit mining operations with uncertain metal supply and long-term stockpiles

    Access Status
    Fulltext not available
    Authors
    Asad, Mohammad Waqar
    Dimitrakopoulos, R.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Asad, M.W. and Dimitrakopoulos, R. 2012. Optimal production scale of open pit mining operations with uncertain metal supply and long-term stockpiles. Resources Policy. 37 (1): pp. 81-89.
    Source Title
    Resources Policy
    ISSN
    03014207
    URI
    http://hdl.handle.net/20.500.11937/28400
    Collection
    • Curtin Research Publications
    Abstract

    An open pit mining operation consists of various stages, and the calculation of the production capacities of these stages depends upon the available supply of ore (mineralized material of economic value) and waste material. Cutoff grade is the criterion that specifies the amount of ore and waste. The material with grade equal to or higher than the cutoff grade is classified as ore. The material with grade less than the cutoff grade is considered waste. While this explains the link between cutoff grade theory and the calculation of production capacities, the majority of optimization models for finding production capacities not only disregards this relationship but also ignores expected variations and uncertainty in metal content or the available supply of ore and waste material. This work proposes an extension to an established theory of cutoff grade to determine the optimal production capacities using a stochastic framework relying on multiple realizations of the grade-tonnage curves. The proposed model (i) maximizes the net present value of cash flows over the life of an operation; (ii) offsets the initial investment in developing the constituent stages of an operation; and (iii) explores the impact of creating a long-term stockpile on the designed operational capacities. Applications to both a hypothetical and an actual copper deposit demonstrate the benefits of this model.

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