Beer, AJ 2023, 'A case study of a waste dump design for oxidised material in a Western Australian mine', in PM Dight (ed.), SSIM 2023: Third International Slope Stability in Mining Conference
, Australian Centre for Geomechanics, Perth, pp. 261-276, https://doi.org/10.36487/ACG_repo/2335_14
This paper uses a design review for an in-pit waste dump in partly to fully oxidised material as a case study to discuss the generalised processes adopted in geotechnical design (or validation of a mining design) for waste dumps. The example used is for a West Australian open pit nickel mine in an area of moderate rainfall, with the mining above the natural groundwater table. Issues addressed in detail include methods for material characterisation (laboratory testing, or empirical relationships available in the literature, backanalysis), factors influencing the stability of different parts of the dump (dump base, main dump body and tip face), rationale behind selecting the appropriate shear strength model types for modelling the dump material, simulation of runoff for surface-water management design, effects of loading the tip head by vehicles operating nearby, influence of water, foundation conditions and their assessment and practical considerations for dump operation. The role of back-analysis and assessment of tip face angles in selecting appropriate material properties for modelling is also described.
Keywords: waste dump design, material characterisation, slope design principles, operational considerations for waste dumps
Barton, N & Kjærnsli, B 1981, ‘Shear strength of rock fill’, Journal of the Geotechnical Engineering Division, vol. 107, no.7,
Dwumfour, D, Dixon, J & Mylvaganam, J 2020, ‘Waste rock characterisation and stability assessments for feasibility level studies’, in PM Dight (ed.), Slope Stability 2020, Australian Centre for Geomechanics, Perth, pp. 677–690,
Hawley, MP & Cunning, J 2017, Guidelines for Mine Waste Dump and Stockpile Design, CSIRO Publishing, Melbourne.
Leps, T 1970, ‘Review of shearing strength of rockfill’, Journal of the Soil Mechanics and Foundation Division, Proceedings of the American Society of Civil Engineers, vol. 96, no .4, pp. 1159–1170.
Linero-Molina, S, Contreras, LF & Dixon, J 2021, ‘Estimation of shear strength of very coarse mine waste’, in PM Dight (ed.), Slope Stability in Mining 2021, Australian Centre for Geomechanics, Perth, pp. 341–356,
Terzaghi, K & Peck, RB 1967, ‘Soil mechanics in engineering practice’, John Wiley & Sons, New York.