首页|Geophysics applied to the optimization of blasting design at the S11D mine, Carajas, Brazil
Geophysics applied to the optimization of blasting design at the S11D mine, Carajas, Brazil
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NSTL
Elsevier
Carajas mineral province, Para State, Brazil, is one of the world's largest producers of iron ore. The study area is located inside this province at the S11D Mine in its southern portion. The iron ore is composed by banded iron formations (BIFs), consisting basically of hematite and jaspilite bodies. The weathering processes promoted formation of blocks of jaspilite immersed in friable hematite. The current methodology applied in the production benches, using just drillhole investigations, is limited to detect boulders of compact rock, that depending on their sizes, can compromise the Truckless System operation making it costly and unproductive. Electrical and electromagnetic dataset were able to differentiate these two types of materials, one, more conductive (<8000 Omega-m), with attenuated signal in the GPR section associated with jaspilites and another, most resistive (> 8000 Omega-m) with the coinciding contrasted signal from GPR sections associated with the friable hematite. The near surface geophysical dataset interpretation constrained by a detailed bench geological mapping, was capable to solve the referred problem by indicating the location of the compact bodies through the interpretation of the 3D resistive / reflective models, enhancing geological model and rescaling blast design. The final Geophysical model guided the optimization of the blasting design with geometric and energetic improvements.
ResistivityGPRBlastingJaspiliteFriable Hematite
Vieira, Andre Luiz、Braga, Marco Antonio da Silva、Barbosa, Marcelo Roberto、Koppe, Jair Carlos、Oliveira, Lorena Andrade、da Rocha, Demetrius C. G.、Cunha, Alan de Souza、Dias, Leonardo S. O.、da Gama, Maria Filipa Perez
NSTL
Elsevier
