Vidal da Silva, AE 2022, 'The B11 support methodologies and QAQC systems: creating and implementing a traceable support system', in Y Potvin (ed.), Caving 2022: Fifth International Conference on Block and Sublevel Caving
, Australian Centre for Geomechanics, Perth, pp. 255-268, https://doi.org/10.36487/ACG_repo/2205_16
The B11 block cave at BHP Leinster mine is a mini block cave located below and adjacent to the historic Perseverance sublevel cave. The host environment is characterised by high stress conditions (due to both regional stress and previous mining) as well as localised zones of poor rock mass.
The history of the Perseverance cave and the expected high levels of stress conditions and stress changes that the B11 excavations were anticipated to undergo required a development methodology that would provide a high level of assurance, both from the design as well as from the implementation points of view.
This paper describes the QAQC systems developed and implemented, as well as the practical implementation difficulties and gaps encountered between design and implementation.
Variations from the original mine design and scheduling, as well as its impacts are described and evaluated.
Keywords: Leinster, monitoring, seismicity, permit, cave, development
BHP 2018, B11 Project Execution Plan, internal document.
Barnes, SJ, Gole, MJ & Hill, RET 1988, ‘The Agnew nickel deposit, Western Australia’, Economic Geology, vol. 83, pp. 524–536.
Hill, RET, Barnes, SJ, Gole, MJ & Dowlings, SE, 1995, ‘The volcanology of komatiites as deduced from field relationships in the Norseman-Wiluna greenstone belt, Western Australia’, Lithos, vol. 34, p. 159–188.
Hopkins, M 2018, Nickel West Seismic Hazard Management Plan, internal document.
Liu, SF, Champion, DC & Cassidy, KF, 2002, Geology of the Sir Samuel 1:250 000 Sheet Area, Western Australia, Report 2002/14, Geoscience Australia.
Thin, I, Windsor, C, Villaescusa, E & Stone, C 2006, ‘Understanding the stress environment for the Perseverance Deeps pre-feasibility study’, in J Hadjigeorgiou & M Grenon (eds), Proceedings of the Third International Seminar on Deep and High Stress Mining, Université Laval, Quebec City, Section 10, 15 p.
Trofimovs, J, Tait, MA, Cas, RAF, McArthur, A & Beresford, SW 2003, ‘Can the role of thermal erosion in strongly deformed komatiite-Ni-Cu-(PGE) deposits be determined? Perseverance, Agnew-Wiluna Belt, Western Australia’, Australian Journal of Earth Sciences, vol. 50, no. 2, pp. 199–214.
Vidal da Silva, A, 2022a, Leinster Mine Ground Control Management Plan, internal document.
Vidal da Silva, A, 2022b Leinster Mine Support Standards, internal document.