Authors: Douglas-Brown, RE

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DOI https://doi.org/10.36487/ACG_repo/2205_35

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Douglas-Brown, RE 2022, 'Monitoring and controls for sublevel caving in an anisotropic rock mass', in Y Potvin (ed.), Caving 2022: Fifth International Conference on Block and Sublevel Caving, Australian Centre for Geomechanics, Perth, pp. 517-528, https://doi.org/10.36487/ACG_repo/2205_35

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Abstract:
Nickel West Venus orebody at Leinster, Western Australia is being mined using the sublevel caving (SLC) method. Learnings from the initial caving area, a small footprint SLC project within a high stress environment, are presented in this paper. The Venus orebody is situated within a heterogenous, anisotropic geological setting creating complexities for easy cave creation. Factoring in all geotechnical variables and potential risks, including, but not limited to, seismic response, dilution of ore, airgap creation, mud rush and surface subsidence impacting existing infrastructure. The first section of the Venus orebody SLC was created from three levels and established a means to calibrate the impacts of draw controls in an area with distinct changes in rock mass strength vertical to drawpoints. The draw strategy focused not only on maximising ore extraction but maintaining an adequate crown pillar due to the inferred subsidence zone and potential for interaction with surface infrastructure. Cave monitoring included seismic analysis, Elexon Smart Markers, fragmentation for bulking factor of blasted and caved material. Displacement of sigma one stress was inferred from seismic analysis, with expected energy release zones established. Cave height was tracked through a combination of all datasets, seismicity, geotechnical instrumentation, and height of draw (HOD).

Keywords: sublevel caving, cave monitoring, draw control, seismicity, height of draw

References:
Bewick, RP 2021, ‘The strength of massive to moderately jointed rock and its application to cave mining’, Rock Mechanics and Rock Engineering, vol. 54, no. 8, pp. 3629–3661. .
Cumming-Potvin, D, Wesseloo, J, Jacobsz, SW & Kearsley, E 2018, ‘A re-evaluation of the conceptual model of caving mechanics’,
in Y Potvin & J Jakubec (eds), Caving 2018: Proceedings of the Fourth International Symposium on Block and Sublevel Caving, Australian Centre for Geomechanics, Perth, pp. 179–190,
Dempers & Seymour Pty Ltd 2017, BHP Billiton Nickel West Perseverance MRMM.
Duplancic, P 2001, Characterisation of Caving Mechanisms Through Analysis of Stress and Seismicity, PhD thesis, The University of Western Australia, Perth.
Duplancic, P & Brady, BH 1999, ‘Characterisation of caving mechanisms by analysis of seismicity and rock stress’, Proceedings of the 9th ISRM Congress, International Society for Rock Mechanics, pp. 1049–1053.
Duuring, P, Bleeker, W & Beresford, SW 2007, ‘Structural modification of the komatiite-associated Harmony nickel sulfide deposit, Leinster, Western Australia’, Economic Geology, vol. 102, no. 2, pp. 277–297.
Gumulya Y, Zea L & Kaksonen AH 2022, ‘In situ resource utilisation: The potential for space biomining’, Minerals Engineering, vol. 176, p. 107288,
Hogan, P & Thompson, A 2019, Report on Intact Rock Properties Testing for Venus Nickel Project, Western Australian School of Mines, Curtin University.
Johnson, DB 2014, ‘Biomining—biotechnologies for extracting and recovering metals from ores and waste materials’, Current Opinion in Biotechnology, vol. 30, pp. 24–31, ISSN 0958-1669,
Kalenchuk, KS, McKinnon, S & Diederichs, MS 2008, ‘Block geometry and rockmass characterization for prediction of dilution potential into sub-level cave mine voids’, International Journal of Rock Mechanics and Mining Sciences, vol. 45, issue 6, pp. 929–940,
Laubscher, DH 2001, ‘Cave mining – the state of the art’, in WA Hustrulid & RL Bullock (eds), Underground Mining Methods: Engineering Fundamentals and International Case Studies, Society for Mining, Metallurgy and Exploration, Englewood, pp. 455–463.
Laurent, G, Izart, C, Lechenard, B, Golfier, F, Marion, P, Collon, P, Truche, L, Royer, JJ & Filippov, L 2019, ‘Numerical modelling of column experiments to investigate in-situ bioleaching as an alternative mining technology’, Hydrometallurgy, vol. 188, pp. 272–290,
Martens, E, Prommer, H, Sprocati, R, Sun, J, Dai, X, Crane, R, Jamieson, J, Ortega Tong, P, Rolle, M & Fourie, A 2021, ‘Toward a more sustainable mining future with electrokinetic in situ leaching’, Science Advances, vol. 7, no. 18, ,
Perring, CS 2015, ‘A 3-D geological and structural synthesis of the Leinster area of the Agnew-Wiluna belt, Yilgarn craton, Western Australia, with special reference to the volcanological setting of komatiite-associated nickel sulfide deposits’, Economic Geology, vol. 110, no. 2, pp. 469–503.
Pierce, M, Cundall, P, Potyondy, D & Mas Ivars, D 2007, ’A synthetic rock mass model for jointed rock’, Proceedings of the 1st CanadaU.S. Rock Mechanics Symposium, vol. 1, Vancouver, Canada, pp. 341–349.
Prado, D & de Bruyn, I 2019, Venus Geotechnical Model Update for BHP Nickel West, SRK Consulting, West Perth.
Sainsbury, B 2012, A Model for Cave Propagation and Subsidence Assessment in Jointed Rock Masses, PhD thesis, University of South Wales.
Varden, RP & Woods, MJ 2015, ‘Design approach for squeezing ground’, in Y Potvin (ed.), Design Methods 2015: Proceedings of the International Seminar on Design Methods in Underground Mining, Australian Centre for Geomechanics, Perth, pp. 489–504,




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