1864 Seeing that the obtained law presents a higher prediction than the first (K95% > K50%), it was validated with the results of the blasting design executed on site. 2.6 Drilling Quality Control The quality of the drilling process significantly influences downstream mining and processing operations, including rock fragmentation and ore recovery rates. Uncontrolled drillhole deviation often results in poor blast performance, excessive overbreak, dilution from adjacent cemented hydraulic fill walls, reduced stope recovery efficiency, potential geomechanical instability in exposed walls and increased operational costs. 2.6.1 Diagnostic Framework and Improvement Evolution Based on the experience during the mineral extraction at the Sofía D orebody, one of the primary challenges during the sequential recovery of secondary stopes was reducing overbreak in the surrounding cemented hydraulic backfill from an initial 18% to 10%. Analysis identified drill hole deviations as a key contributing factor adversely affecting blasting performance and fragmentation uniformity. To address this issue, a comprehensive diagnostic process was implemented using a multi-dimensional assessment framework visualized as a radar chart (Figure 4). The radar chart facilitated a baseline “Current” evaluation of actual performance, direct comparison against a “Base Target” representing optimal operational goals, and assessment relative to a “Risk Threshold” defining the minimum acceptable levels to prevent geomechanical instability or excessive cost overruns. Figure 6. Multi-Dimensional Assessment of Drilling Quality in SLS Production Rings. Initial diagnosis (pre-improvement) identified critical deficiencies in drill hole deviation (scored 4/10), drilling tools (4/10), drill string condition (5/10), and operator performance (4.5/10), with several indicators falling near the Risk Threshold. These findings prompted the implementation of targeted corrective measures, including optimized drill ring patterns, real-time deviation monitoring, and vibration studies to calibrate explosive charges. Improvement was tracked over a six-month period, with postintervention radar chart assessments showing progressive convergence toward the “Base Target.” For example, the deviation score improved from 4/10 to 8/10, operator performance from 4.5/10 to 7/10, and drilling tools from 4/10 to 9/10.
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