Dwumfour, D, Dixon, J & Mylvaganam, J 2020, 'Waste rock characterisation and stability assessments for feasibility level studies', in PM Dight (ed.), Proceedings of the 2020 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering
, Australian Centre for Geomechanics, Perth, pp. 677-690, https://doi.org/10.36487/ACG_repo/2025_43
Regulatory approval frameworks, such as that of the Department of Mines, Industry, Regulation and Safety (DMIRS) in Western Australia Mining Proposal approval process, require detailed design reports for waste rock dumps for mining projects.
Determination of waste rock shear strength parameters for waste rock dump design at a feasibility project level is often challenging as a result of factors such as spatial variation, lack of representative data and limited knowledge of waste rock movement schedules. Trial open pits or blasted representative material are rarely available.
A practical approach to derive design material parameters using the Barton–Kjaernsli criterion (Barton & Kjaernsli 1981; Barton 2008) is provided, based on available site-specific feasibility level geotechnical data for a case study site in the Pilbara region of Western Australia. Stability assessments for various scenarios including for possible unfavourable conditions such as earthquake and storm events expected in the long-term are required to demonstrate that safe operational conditions and effective mine closure designs can be facilitated.
Keywords: material classification, waste rock dumps, slope stability analysis
AMC 2019, Technical Report: Iron Bridge Geotechnical Feasibility Study, internal report, unpublished.
Barton, N & Kjaernsli, B 1981, ‘Shear strength of rock fill’, Journal of the Geotechnical Engineering Division, vol. 107, no. 7,
Barton, N 2008, ‘Shear strength of rockfill, interfaces and rock joints, and their points of contacts in rock dumps design.’, in AB Fourie (ed.), Proceedings of the International Seminar on the Management of Rock Dumps, Stockpiles and Heap Leach Pads, Australian Centre for Geomechanics, Perth, pp. 3–18.
Franklin, JA & Chandra, R 1972, ‘The slake durability index’, International Journal of Rock Mechanics and Mining Sciences, vol. 9, pp. 325‒342.
Hawley, MP & Cunning, J 2017, Guidelines for Mine Waste Dump and Stockpile Design, CSIRO Publishing, Clayton, 496 p.
Indraratna, B, Wijewardena, L & Balasubramaniam, A 1993, ‘Large-scale triaxial testing of greywacke rockfill’, Geotechnique, vol. 43, no. 1, pp. 37–51.
Leps, T 1970, ‘Review of shearing strength of rockfill’, Journal of the Soil Mechanics and Foundations Division, Proceedings of the American Society of Civil Engineers, vol. 96, iss. 4, pp. 1159–1170.
Read, JRL & Stacey, PF 2009, Guidelines for Open Pit Slope Design, CSIRO Publishing, Clayton, 496 p.
Simpson, C 2017, ‘The Iron Bridge magnetite deposits’, Proceedings Iron Ore 2017, The Australasian Institute of Mining and Metallurgy, Melbourne, pp. 287–294.
SRK Consulting 2014, Technical report: Solomon Mine – Geotechnical Characterisation of Coarse-Grained Wastes, internal report, unpublished.