ABSTRACT

Short-term production scheduling in open pit mining consists of defining the extraction sequence and process allocation of mineralised material over time-scales of either months, weeks, or days. An effective short-term production schedule ensures compliance with the production targets and restrictions imposed by the long-term plan. The method proposed herein outlines a new approach to simultaneously optimise the short-term production sequence with the mobile equipment allocation plan while incorporating both material grade and equipment performance uncertainty. A new simulation methodology is introduced to generate more realistic equipment performance scenarios, as well as a new concept of including ramp positions in the formulation to efficiently facilitate minable extraction patterns. This short-term model is bench-marked against a conventional design at one of the largest copper mines in the world, and the results show improved production target compliance by delivering more consistent ore quantity and quality to each processing destination, and a physical extraction sequence that has a greater likelihood of being realised in the face of equipment performance and truck cycle time uncertainty.

摘要

露天采矿的短期生产计划包括在数月，数周或数天的时间范围内定义矿化材料的提取顺序和过程分配。有效的短期生产计划可确保遵守长期计划所规定的生产目标和限制。本文提出的方法概述了一种新方法，该方法可同时利用移动设备分配计划优化短期生产顺序，同时兼顾材料等级和设备性能不确定性。引入了一种新的模拟方法来生成更现实的设备性能场景，以及一种新概念，其中将斜坡位置包括在配方中以有效地促进可开采的模式。