1866 Figure 8. P80 determination via image analysis. 2.8 Volumetric surveys of mined stopes Post-blast 3D volumetric surveys were conducted to reconcile the actual mined volume 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.
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