Authors: Hutchison, BJ; Morrison, AT; Lucas, DS

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DOI https://doi.org/10.36487/ACG_repo/2025_54

Cite As:
Hutchison, BJ, Morrison, AT & Lucas, DS 2020, 'Steep wall mining: engineered structures used in the management of rockfall hazards at Kanmantoo copper mine', 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. 831-848, https://doi.org/10.36487/ACG_repo/2025_54

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Abstract:
The Kanmantoo Copper Mine in the Adelaide Hills of South Australia was operated by Hillgrove Resources Limited from 2010–2019. This was a steep-walled, 360 m deep, open pit mine that required an extensive rockfall management plan and the installation of significant rock support and rockfall mitigation measures. The adoption of these systems allowed inter-ramp angles of the structurally controlled west wall to be steepened from 45 to 57°, over a height of 300 m. This paper describes the various methods utilised to manage a range of rockfall hazards experienced at the mine including the use of shear pins, drape mesh, attenuator fences, low- and high-energy rock catch fences and mesh/cable strapping. The design, construction methods, associated costs and the performance of the various engineering controls are described.

Keywords: rockfall, steep mining, rock support

References:
Hutchison, BJ, Chambers, J, Macqueen, G, Salas, E & Huang, N 2015, ‘The use of rockfall statistics in managing small rockfalls in two Australian open pit mines’, Proceedings of the 2015 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering, The Southern African Institute of Mining and Metallurgy, Johannesburg.
Hutchison, BJ, Chambers, J, Gannon, S & Oko-oboh, D 2017, ’Case study of joint structure and the design and performance of open pit walls at the Kanmantoo Copper Mine’, Proceedings of the Tenth International Mining Geology Conference, The Australasian Institute of Mining and Metallurgy, Melbourne, pp. 355–364.
Rocscience 2018, RocFall, version 6.011, computer software, Toronto, https://www.rockscience.com




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