against the planned stope geometry and quantify overbreak, particularly in the exposed cemented hydraulic fill (CHF) walls. Figure 9 presents an example of isometric view of the surveyed void in stope TJO 017U042U142, segmented by the three sequential extraction levels: • Upper span (Level 059U to Floor of Level 080U): 5,896.9 m³ • Middle span (Level 038U to Floor of Level 059U): 5,649.2 m³ • Lower span (Level 017U to Floor of Level 038U): 5,368.1 m³ The volume calculation was performed using wireframes through a mine planning software. Figure 9. 3D isometric view of post-blast volume survey for stope TJO 017U042U142. These reconciled volumes enabled precise measurement of overbreak in CHF exposures, confirming a reduction from 18% to 10% overall. The survey data supported validation of blast design effectiveness, vibration controls, and wall stability, contributing to the achieved 98% mineral recovery and minimized external dilution. 3. CONCLUSIONS • Implementation of this methodology has delivered measurable outcomes: mineral recovery in secondary stopes reached 98%, overbreak into cemented hydraulic fill was reduced from an initial 18% to 10%, and the economic value added per recovered stope averaged USD 54,000, generating an estimated annual opportunity value of USD 650,000 at current production rates. These results demonstrate that high-recovery pillar extraction can be achieved safely and repeatably in SLS operations bounded by cemented fill, offering a scalable and replicable strategy for similar underground mining projects • Geomechanical characterization and optimized blasting can enable safe, high-recovery stope extraction in underground mining. It aligns with the congress’s theme of Sustainable Infrastructure & Mine Design, showcasing a replicable strategy that balances productivity, stability, and economic value. The integration of blast monitoring tools and design adjustments supports continuous improvement and long-term viability.
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