2036 target fragmentation range. Figure 3 – Cost minimization of the blasting-to-primary-crushing chain and the optimal fragmentation range 2.2 Optimization of rock fragmentation consistent with cost minimization In the previous section, the ideal fragmentation range to minimize operating costs across the drilling–blasting–loading–hauling and primary crushing chain at the Brucutu mine varies from 28 to 32 cm. Therefore, the next step is to develop and design blasting methodologies that deliver this fragmentation range, which in this case corresponds to optimal values, applying the developed model and present in 22. Item. To fragmentation outcomes used Artificial Intelligence, and make field tests, and evaluate the results, in order to finally calibrate and select the appropriate blast pattern. By applying Equations 6, 7, 8, 9, and 10 and Table 1, as well as blasting and AI software, for 7 7/8” and 9” drill holes, the geometric parameters and explosive charges using Emulsion 100 were obtained, as presented in Tables 1, 2, 3, and 4. Table 1 – Sizing of the geometric elements of the blast design for 7 7/8” Lithology A(m) E (m) T (m) J (m) Min Max Med Min Max Avg. Min Max Avg. Friable 5 6.5 10 8.3 3.5 5 4.3 1 2 1.5 Semi-compact 4.6 5.5 6.2 5.9 3.2 4.6 3.9 0.9 1.8 1.4 Compact 4.2 4.8 5 4.9 2.9 4.2 3.6 0.8 1.7 1.3 Table 2 – Sizing of the charge and powder factor for the 7 7/8” blast design Lithology Q (kg/furo) RC (g/t) Min Max Avg. Min Max Avg. Friable 216.8 307.1 261.9 131.4 192.4 161.9 Semi-compact 228.3 311.4 269.9 242.2 298.3 270.2 Compact 239.9 315.8 277.8 343.4 393.7 368.5 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 Cusotos de operaçao (US$/t) Fragmentação X80 (cm) IF ISC IC
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