Integrated short- and medium-term underground mine production scheduling

Nehring, M., Topal, E., Kizil, Mehmet S. and Knights, P. (2012) Integrated short- and medium-term underground mine production scheduling. Journal of The South African Institute of Mining and Metallurgy, 112 5: 365-378.

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Author Nehring, M.
Topal, E.
Kizil, Mehmet S.
Knights, P.
Title Integrated short- and medium-term underground mine production scheduling
Journal name Journal of The South African Institute of Mining and Metallurgy   Check publisher's open access policy
ISSN 0038-223X
Publication date 2012-05
Sub-type Article (original research)
Volume 112
Issue 5
Start page 365
End page 378
Total pages 14
Place of publication Johannesburg, South Africa
Publisher Southern African Institute of Mining and Metallurgy
Collection year 2013
Language eng
Formatted 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 mediumterm 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.
Keyword Production scheduling
Mixed integer programming
Integrated scheduling
Mine planning
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2013 Collection
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 21 Sep 2012, 13:05:46 EST by Dr Mehmet Kizil on behalf of School of Mechanical and Mining Engineering