2034 Table 1 – Lithological and geotechnical characteristics dos rock masses da Brucutu mine Geomechanical characteristics / Lithology type Friable itabirite (IF) Semicompacta (ISC) Compacta (IC) Litologias hal, hf, ia, ial, if ha, hgo, hmn, igp, imn xi cg, hc, ic Occurrence (%) 9,3 17,6 73,1 Densidade (t/m3) 2,9 3,30 3,7 Velocidade onda P (m/s) 1500 - 2250 2250 - 3000 >3000 Uniaxial compressive strength (MPa) 50 - 125 125 - 225 225 - 300 Tensile strength (MPa) 5 - 12 12 - 22 22 - 30 Young's Modulus (GPa) 15 25 47 Coeficiente de Poisson, u 0,20 0,21 0,22 Fator de rocha, Ar 2,3 4,5 7,8 Legend: cg=canga; ha=amphibolitic hematite; hal=aluminous hematite; ...; igo=goethitic itabirite; imn=manganiferous itabirite; xi=schist After a rigorous study and analysis of the actual technical and economic data from the drilling, blasting, loading, transport, and primary crushing operations at the Brucutu mine, corresponding to the years 2023 to 2025, it was possible to obtain the results presented in Table 2.
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