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LONG-TERM AND SHORT-TERM PRODUCTION SCHEDULING: INTERACTION AND COORDINATION
Abstract
In open pit mining operations, production scheduling is a hierarchical process for optimization of extraction capacities, resource allocations and types of ore dispatches. Production scheduling deals with equipment capacities, time periods, reserve constraints, wall slope restrictions, ore grade averages and feed controls to mill over a reasonable long-term schedule. Its results then form the inputs of short-term functions more detailed such as scheduling and to control at a lower level which usually has more accurate estimations of operational levels. It?s therefore necessary to integrate long-term scheduling and short-term scheduling in open pit mining. Main reasons of the idea include dictated constraints of a short-term schedule by the long-term scheduling decisions and also to keep on optimality and feasibility of both schedules. If the overall performance of the production system is to be improved, disruptions must be managed effectively, with careful consideration of both scheduling decisions. Many researchers have provided independent models for these two scheduling (long-term and short-term), and each of them has been considered independently. This paper focuses on the interaction between long-term production scheduling (LTPS) and short-term production scheduling (STPS), emphasizing the coordination of decisions, with special emphasis on making robust decisions at both levels in the face of unexpected disruptions. The proper coordination between LTPS and STPS is imperative to ensure that the LTPS output can be used to facilitate STPS. In this research, the disadvantages of independent scheduling models (LTPS and STPS) are expressed. On the other hand, the advantage of interaction and coordination between the two scheduling models is described. We will point out the necessity of the interaction between the two schedules so that researchers can solve this problem in the near future.
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