1969 Figure 124 - Vibration model from signature holes (Antas 2) Based on validation outcomes, the A3N pit was segmented according to distance to the administrative area, as shown in Figure 125. The data demonstrated that achieving the required control and quality necessitated reducing blasthole diameter from 5.5 in to 4.5 in. In closer zones (Sectors I and II), bench height was reduced from 10 m to 5 m to respect MIC limits needed to control vibration at the nearby administrative area and the water dam. A summary of initial drill‑and‑blast parameters for each A3N sector is presented in Table 47. Figure 125 - Zoning map by stand‑off y = 323.75x-1.446 R² = 0.8687 y = 523.35x-1.446 R² = 1 1.00 10.00 100.00 1.00 10.00 100.00 Vibration (mm/s) Scale Distance Vibration Regression 95% Prediction Mean Vibration Regression 95% Prediction
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