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: Proceedings of the 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
(https://papers.acg.uwa.edu.au/p/2205_16_Vidal da Silva/)
Abstract: 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