Stochastic mine production scheduling with multiple processes: Application at Escondida Norte, Chile

Mining complexes can contain multiple mines operating simultaneously along with multiple processing streams, stockpiles and products. Stochastic optimization methods developed to date generate only local optimal solutions in the sense that they do not consider the entire mining complex. This paper p...

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Bibliographic Details
Published in:Journal of mining science 2013-07, Vol.49 (4), p.583-597
Main Authors: Montiel, L., Dimitrakopoulos, R.
Format: Article
Language:English
Subjects:
Algorithms
Deviation
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Mineral industry
Mineral Mining Technology
Mineral Resources
Mining industry
Production processes
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Summary:Mining complexes can contain multiple mines operating simultaneously along with multiple processing streams, stockpiles and products. Stochastic optimization methods developed to date generate only local optimal solutions in the sense that they do not consider the entire mining complex. This paper presents an extension of a multi-stage method used for generating long-term risk-based mine production schedules, to operations with multiple rock types and processing streams. The developed method uses a simulated annealing based algorithm during the optimization stage, seeking to minimize deviations from production targets for waste and different ore processing streams. The proposed approach is applied at Escondida Norte copper deposit, Chile, in which sulphide, oxide, mixed and waste materials are present with milling, bio-leaching and acid-leaching being the available processing streams. The stochastic schedule generates expected deviations from mill and waste production targets smaller than 5%, which avoid indirect costs associated to idle capacities. A schedule generated conventionally exhibits expected deviations of the order of 20%.
ISSN:1062-7391
1573-8736
DOI:10.1134/S1062739149040096