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    Pilot Point Optimization of Mining Boundaries for Lateritic Metal Deposits: Finding the Trade-off Between Dilution and Ore Loss

    264675.pdf (2.006Mb)
    Access Status
    Open access
    Authors
    Dagasan, Y.
    Renard, P.
    Straubhaar, J.
    Erten, Oktay
    Topal, Erkan
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Dagasan, Y. and Renard, P. and Straubhaar, J. and Erten, O. and Topal, E. 2019. Pilot Point Optimization of Mining Boundaries for Lateritic Metal Deposits: Finding the Trade-off Between Dilution and Ore Loss. Natural Resources Research. 28 (1): pp. 153-171.
    Source Title
    Natural Resources Research
    DOI
    10.1007/s11053-018-9380-9
    ISSN
    1520-7439
    School
    Dept of Mining Eng & Metallurgical Eng
    Remarks

    The final publication is available at Springer via 10.1007/s11053-018-9380-9

    URI
    http://hdl.handle.net/20.500.11937/66634
    Collection
    • Curtin Research Publications
    Abstract

    Geological contacts in lateritic metal deposits (footwall topographies) often delineate the orebody boundaries. Spatial variations seen in such contacts are frequently higher than those for the metal grades of the deposit. Therefore, borehole spacing chosen based on the grade variations cannot adequately capture the geological contact variability. Consequently, models created using such boreholes cause high volumetric uncertainties in the actual and targeted ore extraction volumes, which, in turn, lead to high unplanned dilution and ore losses. In this paper, a method to design optimum ore/mining boundaries for lateritic metal deposits is presented. The proposed approach minimizes the dilution/ore losses and comprises two main steps. First, the uncertainty on the orebody boundary is represented using a set of stochastic realizations generated with a multiple-point statistics algorithm. Then, the optimal orebody boundary is determined using an optimization technique inspired by a model calibration method called Pilot Points. The pilot points represent synthetic elevation values, and they are used to construct smooth mining boundaries using the multilevel B-spline technique. The performance of a generated surface is evaluated using the expected sum of losses in each of the stochastic realizations. The simulated annealing algorithm is used to iteratively determine the pilot point values which minimize the expected losses. The results show a significant reduction in the dilution volume as compared to those obtained from the actual mining operation.

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