Void model construction for enhanced mine planning and geomechanical stability at Fazenda Brasileiro mine

Authors: Campos, RM; Soares, PR; Cambraia, DV; Manaia, DM Download Paper Open access courtesy of:

DOI https://doi.org/10.36487/ACG_repo/2535_33

Cite As:
Campos, RM, Soares, PR, Cambraia, DV & Manaia, DM 2025, 'Void model construction for enhanced mine planning and geomechanical stability at Fazenda Brasileiro mine', in JJ Potter & J Wesseloo (eds), SSIM 2025: Fourth International Slope Stability in Mining Conference, Australian Centre for Geomechanics, Perth, https://doi.org/10.36487/ACG_repo/2535_33



Abstract:
This paper presents a comprehensive methodology for developing void models in open cut mining operations, with application to sites transitioning from underground to surface extraction. The approach combines historical mine data, geotechnical investigations, and advanced scanning technology to accurately map subsurface voids. Key aspects include processing historical stope records, implementing targeted drilling programs, and evaluating backfill characteristics through reverse circulation drilling. The methodology emphasises continuous model refinement to address geomechanical changes and ensure operational safety during concurrent open cut and underground mining activities. Implementation resulted in 25% decrease in unplanned ore loss through proactive risk management and optimised resource allocation. Examples of geotechnical incidents include crown pillar collapses, uncontrolled subsidence, and rib pillar failures. Geostatistical void density models were used to prioritise drilling locations, eliminating redundant investigation in low-risk areas.

Keywords: void modelling, open cut, underground mining, void scanning, geotechnical engineering

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