Authors: Tapia, A; Contreras, LF; Jefferies, M; Steffen, O

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Tapia, A, Contreras, LF, Jefferies, M & Steffen, O 2007, 'Risk Evaluation of Slope Failure at the Chuquicamata Mine', in Y Potvin (ed.), Proceedings of the 2007 International Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering, Australian Centre for Geomechanics, Perth, pp. 477-495.

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Abstract:
The possibility of increasing the pit slope angles of the Chuquicamata Mine as the pit approaches its planned closure is being considered. Compared to the conventional mine design, the slope steepening is understood to raise the net present value (NPV) of the mine, but also, attracts an increase in possible adverse outcomes related to the increase in the likelihood of slope failures. A quantitative risk evaluation was undertaken to provide information to assist the mine management in their decision by: defining risks in terms of safety and economics, quantifying risk level for different slope configurations and comparing results against industry norms. The approach included three main tasks: (1) evaluation of the total probability of failure (POF) representative of the stability conditions of slopes. (2) Evaluation of the consequences of slope failure on safety of personnel. (3) Evaluation of the consequences of slope failure in terms of economic losses associated with impact on equipment and production, including the Force Majeure event situation (major economic loss affecting the continuation of the mine business). Options for risk mitigation are also discussed briefly. The main purpose of this paper is to present the process of a risk evaluation of mine slopes; therefore, the emphasis has been put on the methodology followed rather than on the actual results obtained.

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