Authors: Hutchison, BJ; Chambers, J

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DOI https://doi.org/10.36487/ACG_repo/2025_103

Cite As:
Hutchison, BJ & Chambers, J 2020, 'Monitoring of structurally controlled deformations at the 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. 1495-1506, https://doi.org/10.36487/ACG_repo/2025_103

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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. The latest Giant Pit was a 360 m deep cutback with a 300 m high inter-ramp slope that had been steepened from 45o from the previous Kavanagh cutback to 57o. The western wall was monitored by various Maptek Sentry Systems over three years from 2016 to 2019. During this time, the wall underwent significant relaxation and encountered multiple rockfalls; the latter which increased in size and frequency as the pit bottom was approached. Maptek laser scanners were positioned at various locations to monitor the wall over the three years. Sentry was used to provide real-time monitoring and alarming capabilities. The Sentry laser scan data captured was analysed in Maptek PointStudio, to remotely map geological structures and identify rockfalls. These rockfalls ranged in size from several kilograms to more than 2,000 t. PointStudio was used to create a report from this data showing the complete mine life dilation and rockfalls that occurred during this period. This paper discusses the deformation history of the west wall, the relationship of these movements to the geological structure and to various rockfalls that occurred during the latter excavation stages.

Keywords: steep wall mining, laser deformation monitoring, remote geologic structural mapping, rockfalls, mine life dilation

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, Southern African Institute of Mining and Metallurgy, Johannesburg.
Hutchison, BJ & Howarth, J 2015, Kanmantoo Mine rockfall and rock wall failures: I-Site 8820 laser scanning applications, Proceedings of the 2015 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering, Southern African Institute of Mining and Metallurgy, Johannesburg, pp. 546–562.
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 2017, Australasian Institute of Mining and Metallurgy, Melbourne.
Hutchison, BJ, Chambers, J, Richards, J & Herrmann, J 2018, ‘Mine Rockfall and Rock Wall Failures – Proven digital laser-based approach for monitoring slopes at the Kanmantoo Copper Mine’, Proceedings of the Fourth Australasian Ground Control in Mining Conference, Australian Institute of Mining and Metallurgy, Melbourne.
Hutchison, BJ, Morrison, AT & Lucas, D 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. 825–842.
Lucas, DS, Vakili, A & Hutchison, BJ 2020, Three-dimensional numerical modelling for successful design of steep slopes at the Kanmantoo Copper Mine, South Australia, 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. 1077–1090.
Maptek 2020, PointStudio, version 8 computer software, Adelaide, South Australia, Australia, products/pointstudio/index.html




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