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Planification stratégique d'une mine souterraine en tenant compte de l'incertitude géologique
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Planification stratégique d'une mine souterraine en tenant compte de l'incertitude géologique
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Dissertation
Planification stratégique d'une mine souterraine en tenant compte de l'incertitude géologique
2015
Overview
Long term mine planning is characterized by several uncertain parameters. Among these, geological uncertainty is the most critical due to its major impact on project feasibility. Indeed, an unexpected mine closure is frequently explained by an overvalued economic potential of the deposit. Furthermore, costs associated to exploration drilling are substantial and consequently, it is imperative to well represent, interpret and use the data collected. Conventionally, deterministic approaches are selected for underground mine planning where an estimated representation of the orebody is used. However, this type of reproduction leads to destruction of extreme values and misrepresentation of the grade variability. This context inspired the subject of this thesis, where, mainly, it aims to integrate and to manage risks related to geological uncertainty while optimizing long-term underground schedule. The selected approach is a stochastic optimization using a set of simulations corresponding to the deposit. First, the objective consists on developing a mathematical model for mine scheduling while considering geological uncertainty. It also aims for risk management regarding production targets. The method suggested is applied to a case study and results obtained are conclusive. Indeed, it leads to a significant increase of the project NPV and an improvement of risk management regarding production expectations. However, the large size of this problem made the resolution difficult and that is why, further studies should work on acceleration strategic without compromising the results quality.
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
9781369487947, 1369487940
