Integrated short- and medium-term underground mine production scheduling

M. Nehring, E. Topal, M. Kizil, P. Knights

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The development of short- and medium-term mine production schedules in isolation from each other has meant that only a local optimum can be achieved when each scheduling phase is carried out. The globally optimal solution, however, can be achieved when integrating scheduling phases and accounting for the interaction between short-term and medium-term activities simultaneously. This paper addresses the task of integrating short- and medium-term production plans by combining the short-term objective of minimizing deviation from targeted mill feed grade with the medium-term objective of maximizing net present value (NPV) into a single mathematical optimization model. A conceptual sublevel stoping operation comprising 30 stopes is used for trialling segregated and integrated scheduling approaches. Segregated medium- and short-term scheduling using separate models achieved an NPV of $42 654 456. The final scheduling approach involved integrating the two scheduling horizons using the newly-developed globally optimal integrated production scheduling model to achieve an NPV of $42 823 657 with smoother mill feed grade. The larger the stope data set, the larger the difference between the two scheduling approaches is likely to be. At the very least, an integrated approach ensures feasibility across the two scheduling horizons, which cannot always be assumed when using a segregated approach.

Original languageEnglish
Pages (from-to)365-378
Number of pages14
JournalJournal of the Southern African Institute of Mining and Metallurgy
Volume112
Issue number5
Publication statusPublished - May 2012
Externally publishedYes

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Scheduling
integrated approach
mill
stoping
Stoping
plan

Keywords

  • Integrated scheduling
  • Mine planning
  • Mixed integer programming
  • Optimization
  • Production scheduling

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Materials Chemistry
  • Metals and Alloys

Cite this

Integrated short- and medium-term underground mine production scheduling. / Nehring, M.; Topal, E.; Kizil, M.; Knights, P.

In: Journal of the Southern African Institute of Mining and Metallurgy, Vol. 112, No. 5, 05.2012, p. 365-378.

Research output: Contribution to journalArticle

Nehring, M. ; Topal, E. ; Kizil, M. ; Knights, P. / Integrated short- and medium-term underground mine production scheduling. In: Journal of the Southern African Institute of Mining and Metallurgy. 2012 ; Vol. 112, No. 5. pp. 365-378.
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