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A Multi-stage methodology for long-term open-pit mine production planning under ore grade uncertainty

Enrique Jélvez, Julián M. Ortiz, Nelson Morales, Hooman Askari-Nasab and Gonzalo Nelis

Article (2023)

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The strategic planning of open pit operations defines the best strategy for extraction of the mineral deposit to maximize the net present value. The process of strategic planning must deal with several sources of uncertainty; therefore, many authors have proposed models to incorporate it at each of its stages: Computation of the ultimate pit, optimization of pushbacks, and production scheduling. However, most works address it at each level independently, with few aiming at the whole process. In this work, we propose a methodology based on new mathematical optimization models and the application of conditional simulation of the deposit for addressing the geological uncertainty at all stages. We test the method in a real case study and evaluate whether incorporating uncertainty increases the quality of the solutions. Moreover, we benefit from our integrated framework to evaluate the relative impact of uncertainty at each stage. This could be used by decision-makers as a guide for detecting risks and focusing efforts.

Uncontrolled Keywords

geological uncertainty; geostatistics; open-pit mine production planning; surface mining; stochastic mixed-integer linear programming; uncertainty assessment

Subjects: 1400 Mining and mineral processing > 1400 Mining and mineral processing
Department: Department of Civil, Geological and Mining Engineering
Funders: Chilean National Research and Development Agency (ANID) - Programs PIA/Basal, FONDECYT Iniciación
Grant number: AFB180004, AFB220002, 11221352, 11230022
PolyPublie URL: https://publications.polymtl.ca/56694/
Journal Title: Mathematics (vol. 11, no. 18)
Publisher: Multidisciplinary Digital Publishing Institute
DOI: 10.3390/math11183907
Official URL: https://doi.org/10.3390/math11183907
Date Deposited: 23 Jan 2024 15:48
Last Modified: 08 Apr 2024 17:07
Cite in APA 7: Jélvez, E., Ortiz, J. M., Morales, N., Askari-Nasab, H., & Nelis, G. (2023). A Multi-stage methodology for long-term open-pit mine production planning under ore grade uncertainty. Mathematics, 11(18), 3907 (19 pages). https://doi.org/10.3390/math11183907


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