DOI https://doi.org/10.36487/ACG_repo/708_21
Cite As:
Pothitos, F & Li, T 2007, 'Slope Design Criteria for Large Open Pits - Case Study', in Y Potvin (ed.),
Slope Stability 2007: Proceedings of the 2007 International Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering, Australian Centre for Geomechanics, Perth, pp. 341-352,
https://doi.org/10.36487/ACG_repo/708_21
Abstract:
The selection of design criteria for large open pits is an area of ongoing importance and one which must
continually be reviewed and improved upon during the lifetime of a mine project. Not only do the design
criteria directly impact upon the business case [and longevity] of a mine project but also the safety related
geotechnical issues, which must be planned for during the design process. The case study presented, is used
to illustrate the criteria and considerations of a large open pit design from an operational perspective. A
consistent message is required to be communicated at all stages and levels involving operators, operational
engineers, designers and management. This paper presents concepts to help interpret what percentage of pit
slope failure is acceptable and the resources required to implement varying inter-ramp slope angles with a
certain percentage of planned failure.
References:
Call, R.D. (1992) Surface Mining Engineering Handbook, Society for Mining, Metallurgy, and Exploration Inc.
Litterton, Colorado, pp. 881-896.
Duncan, J.M. (2000) Factors of safety and reliability in geotechnical engineering. J. Geotechnical and
Geoenvironmental Engineering, 126(4), pp. 307-316.
Karzulovic, A. (2004) The importance of rock slope engineering in open pit mining business optimisation, Invited
Lecture, Proc. 9th Int. Symp. Landslides: Landslides; Evaluation & Stabilisation, Rio de Jeneiro, Brazil, W.
Lacerda, M. Ehrlich, S. Fontoura and A. Sayao (editors), pp. 443-456, Vol. 1, Balkema, New York.
Kirsten, H.A.D. (1983) Significance of probability of failure in slope engineering. The Civil Engineer, South Africa.
pp. 17-27.
Numerical Modelling of Rock Slope
Slope Stability 2007, Perth, Australia 351
Li, T., Pothitos, F. and Hewson, S. (2003) Design and optimisation of Cadia Hill Open Pit, Cadia Valley Operations,
Newcrest Mining Limited. Proc. 5th Large Open Pit Conference, The Australian Institute of Mining and
Metallurgy, Melbourne, pp. 123-126.
McCracken, A. and Jones, G.A. (1986) Use of probabilistic stability analysis and cautious blast design for an urban
excavation, Rock Engineering and Excavation in and Urban Environment, The Institute of Mining and
Metallurgy, Hongkong.
Pine, R.J. (1992) Risk analysis design application in mining geomechanics, Transactions of Institute of Mining and
Metallurgy, (Section A: Mining Industry), pp. A149-A158.
Pothitos, F., Clark, D., Li, T. and Hewson, S. (2003) Slope stability major hazard management plan and operating
procedures at Cadia Hill Open Pit, Cadia Valley Operations, Newcrest Mining Limited. Proc. 5th Large Open Pit
Conference, Kalgoorlie, November 3-5, 2003.
Pothitos, F., Webster, S., Meagher, L. and Li, T. (2006) Cadia Extended Pit instability monitoring and management.
Proc. 2nd Int Seminar on Strategic versus Tactical Approaches in Mining, March 2006, Perth.
Priest, S.D. and Brown, E.T. (1983) Probabilistic stability analysis of variable rock slopes, Transactions of Institute of
Mining and Metallurgy, (Section A: Mining Industry), 1983, pp. A1-A12.
Sjoberg, J. (1999) Analysis of Large Scale Rock Slopes, PhD Thesis, Lulea University of Technology, Lulea.
Sullivan, T.D. (1994) Mine Slope Design, The Chances of Getting the Answer Right and The Risk of Getting it Wrong.
Proceedings Fourth Large Open Pit Mining Conference, Perth, 5-9 September 1994.
U.S. Army Corps of Engineers (1998) Risk-based analysis in geotechnical engineering for support of planning studies.
Engrg. Circular No. 1110-2-554, Department of the Army, Washington, D.C., www.usace.army.mil/usace-
docs&, 27 February 1998.
Slope Design Criteria for Large Open Pits ― Case Study F. Pothitos, T. Li
352 Slope Stability 2007, Perth, Australia