1861 Figure 2 – Geomechanical zoning of Sofia D body (DCR Ingenieros S.R.L. Geomechanical study,2018) 2.1.4. Stope and pillar design parameters Based on the classification of mining geo-conditions, appropriate parameters were selected to determine the stope dimensions. Stope design was performed using the stability chart method (Figure 3) and complementary stability analysis. In this geomechanical study, the criteria proposed by Nickson et al. (2001) was adopted. Their stability chart incorporates the calculation of the stability number “N,” which makes it particularly suitable for the complex and variable ground conditions encountered at the María Teresa mine. Figure 3 – Sofia D Geomechanical zoning, on the right side the calculated values of “N”. (DCR Ingenieros S.R. Ltda. Geomechanical Study,2018) 2.2 Blast vibration monitoring All blasting operations require precise control to minimize their disruptive effects on nearby structures and the environment. As described earlier, recovery of the secondary stopes at Sofia D employs mass blasting, with radial boreholes drilled in a burden-spacing pattern tailored to the rock mass characteristics. To characterize the propagation of detonation-induced waves and assess their potential impact on exposed CHF walls and overall geomechanical stability, blast vibration monitoring was implemented.
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