Authors: Hormazabal, E; Veramendi, R; Barrios, J; Zuñiga, G; Gonzalez, F


Cite As:
Hormazabal, E, Veramendi, R, Barrios, J, Zuñiga, G & Gonzalez, F 2013, 'Slope design at Cuajone Pit, Peru', in PM Dight (ed.), Proceedings of the 2013 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering, Australian Centre for Geomechanics, Perth, pp. 527-539.

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Abstract:
The Cuajone porphyry copper deposit is located on the western slopes of Cordillera Occidental, the southern Andes of Peru. The current pit measures about 2.5 km east–west, 3.0 km north–south, and at the end of 2012, had a maximum depth of 950 m. Mining by open pit methods commenced in 1976 and has continued since that time. Ore production is 80 ktpd. As part of the slope design program and slope optimisation, the past and present performance of the pit slopes was evaluated to provide information on the potential behaviour of future pit expansion. A geomechanical assessment is being carried out to evaluate the stability of the walls of the next expansion. To evaluate the stability of the open pit, a series of geotechnical studies have been performed. These studies involve, among others, slope stability analyses based on limit equilibrium methods and finite element numerical models. In addition, a detailed back-analysis of a five million ton failure (DSE42) was performed to calibrate rock mass properties and to understand slope behaviour in poor rock mass quality. This paper describes the back-analysis of the DSE42 failure and the slope design process for the current pit and next pushback.

References:
Barrios, J. and Veramendi, R. (2011) Condición Actual Zona Inestable D42, Flanco Oeste (Current condition of failure D42, West Wall), SPCC Internal Report R011, submitted in July.
Bellido, B.E. (1979) Geología del Cuadrángulo de Moquehua (Moquehua Geology): Lima, Perú, Instituto Geológico Minero y Metalúrgico, Perú, boletín 15, 78 p.
Bellido, B.E. and Landa, C. (1965) Mapa geológico del Cuadrángulo de Moquehua 1:100.000 (Geologic map of Moquehua), Lima, Perú, Comisión de la Carta Geológica Nacional.
Bieniawski, Z.T. (1989) Engineering Rock Mass Classifications: A Complete Manual for Engineers and Geologists in Mining, Civil and Petroleum Engineering, J. Wiley & Sons, Queensland, 272 p.
Esterhuizen, G. (2004) SBLOCK, Vol. 2.01, User Guide and Reference Manual.
Golder Associates, Itasca S.A. and Piteau Associates (2000) Cuajone Pit Slope Design Recommendations, Vol. 1, Technical Report submitted to Southern Peru Copper Corporation, November.
Goodman, R. and Shi, G.H. (1985) Block theory and its application to rock engineering, Prentice Hall, USA.
Hoek, E. (1994) Strength of Rock and Rock Masses, News Journal, International Society for Rock Mechanics, Vol. 2(2), pp. 4–16.
Hoek, E., Carranza, C. and Corkum, B. (2002) Hoek-Brown Failure Criterion 2002 Edition, Mining and Tunnelling Innovation and Opportunity, in Proceedings 5th North American Rock Mechanics Symposium, R. Hammah, W. Bawden, J. Curran and M. Telesnicki (eds), 7–10 August, Ontario, Canada, University of Toronto Press, Toronto, Vol. 1, pp. 267–273.
Hoek, E. and Diederichs, M. (2005) Empirical estimation of rock mass modulus, International Journal of Rock Mechanics and Mining Sciences, Vol. 43(2), pp. 203–215.
Jennings, J.E. (1970) A mathematical theory for the calculation of the stability of slopes in open cast mines, in Proceedings International Symposium Planning Open Pit mines, P.W.J van Rensburg (ed), Johannesburg, A.A. Balkema, Cape Town, pp. 87−102.
Prudencio, M. and Van Sint Jan, M. (2007) Strength and failure modes of rock mass models with non-persistent joints, International Journal of Rock Mechanics and Mining Sciences, Vol. 44, pp. 890–902.
Read, J. and Stacey, P. (2009) Guidelines for Open Pit Slope Design, CRC Press, 1st edition.
Rocscience Inc. (2010) SLIDE v 6.0, Limit Equilibrium Slope Stability Analysis Software, "" .
Rocscience Inc. (2005) DIPS v 5.0, Graphical and statistical Analysis of Orientation Data Software, "" .
Rocscience Inc. (2011) PHASE2 v. 8.0. Finite Element Analysis for Excavations and Slopes Software, "" .
SRK Consulting, Chile (2012) Estudio Geotécnico rajo Cuajone, Technical Report submitted to Southern Peru Copper Corporation, March 2012.
Steffen, O.K.H., Contreras, L.F., Terbrugge, P.J. and Venter, J. (2008) A Risk Evaluation Approach for Pit Slope Design, in Proceedings 42nd US Rock Mechanics Symposium and 2nd US-Canada Rock Mechanics Symposium 2008, 29 June–2 July 2008, San Francisco, America, American Rock Mechanics Association, Virginia, Vol. 2, pp. 833–850.
WMC (1999) Water Management Services. Numerical Models of Groundwater flow in the Toquepala and Cuajone Pit Areas, Technical Report submitted to Southern Peru Copper Corporation, December 1999.




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