OFFICIAL Figure 3; Results obtained under intact rock conditions for packaged explosive diameters of 1 1/2" and 1 1/4", with a 1.2 m spacing and a 0.5 x 0.5 m grid. Illustration 6; Presplit filter results for 1.2 m spacing. 1.8 m. Spacing. In the simulation utilizing a 1.8 m spacing, the following observations were made: • 1 1/2-inch Explosive Diameter: The performance regarding presplit filter generation is classified as "fair," according to the criteria established in Table 3. As shown in Figure 3, there is sufficient connectivity between the fractures generated by the 1 1/2inch diameter to allow for the formation of a continuous fracture plane. • 1 1/4-inch Explosive Diameter: In contrast, the cracks generated by the 1 1/4-inch diameter fail to coalesce, resulting in an attenuation percentage of less than 20%. According to the classification in Table 3, this represents "Very Poor" performance. • Attenuation Efficiency: The theoretical attenuation percentage calculated through numerical modeling is 34% for the 1 1/2" diameter, while the 1 1/4" diameter yields a value of 18% (see Figure 7).
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