On the use of Parametric Open-Pit Design Models for Mine Scheduling - Pitfalls and Counterexamples
(English)Manuscript (preprint) (Other academic)
This paper discusses a Lagrangian relaxation interpretation of the Picard and Smith (2004) parametric approach to open-pit mining, which finds a sequence of intermediate contours leading to an ultimate one. This method is similar to the well known parametric approach of Lerchs and Grossmann (1965). We give examples of worst case performance, as well as best case performance of the Picard-Smith approach. The worst case behaviour can be very poor in that we might not obtain any intermediate contours at all. We also discuss alternative parametric methods for finding intermediate contours, but conclude that such methods seem to have inherent weaknesses.
Open-pit mining, Picard-Smith model, Lagrangian relaxation, pit design, block value, scheduling
IdentifiersURN: urn:nbn:se:liu:diva-70838OAI: oai:DiVA.org:liu-70838DiVA: diva2:442009