Table 6 – Fragmentation Control Blasting 28 Feet Fragmentation % Passing Cx653010 Cx653017 Cx677010 Rp5970 Rp677010 Cx677011 Cx69961 Cx69941 Media (in) P(10) 0.15 0.82 0.98 0.78 0.83 0.62 0.59 0.66 0.75 P(20) 0.39 1.43 1.75 1.30 1.48 1.13 1.13 1.23 1.36 P(30) 0.72 2.04 2.51 1.80 2.12 1.65 1.70 1.81 1.99 P(40) 1.15 2.67 3.31 2.31 2.80 2.21 2.33 2.43 2.65 P(50) 1.70 3.37 4.19 2.85 3.54 2.82 3.04 3.12 3.39 P(60) 2.45 4.15 5.19 3.45 4.39 3.53 3.87 3.93 4.24 P(70) 3.48 5.10 6.40 4.17 5.42 4.39 4.91 4.92 5.28 P(80) 5.08 6.35 8.01 5.09 6.78 5.55 6.31 6.25 6.67 P(90) 8.08 8.31 10.55 6.52 8.93 7.40 8.62 8.40 8.89 Figure 12 – Fragmentation Long-length blasts of 28 feet. Discussion and Conclusions As a result of this technical project, the following conclusions are established: • Improved blasting efficiency: The combination of electronic and non-electric detonators allowed for more precise timing, optimizing the advance per shot from 6.13 m to 7.58 m. This represents an increase of 1.45 m per shot, equivalent to a 23.65% improvement in blasting performance. • Reduced Overbreak: The initial overbreak, estimated at 30%, was reduced to 17.1%, equating to a 43% decrease in the volume of unwanted broken material, improving contour quality and reducing the need for additional support.
RkJQdWJsaXNoZXIy MTM0Mzk2