Indício de mineralização de manganês no município de Comodoro, Mato Grosso, novas oportunidades para a indústria mineral

Abstract

Evidence of massive manganese was found in the northwest of the State of Mato Grosso, in the municipality of Comodoro. The area is located in the southwest portion of the Amazonian Craton, in the Calimian Jauru Tectonic Domain, which comprises metasedimentary rocks of the Rio Galera Complex and calc-alkaline granites of the Pindaituba Intrusive Suite (Praia Alta and Rio Piolho granites). Chemical analysis of the manganese--bearing sample yielded the following oxide and element concentrations: MnO = 61.4%, BaO = 13.2%, Cu = 751 ppm, Mo = 417 ppm, Pb = 4642 ppm, U = 107.8 ppm and Ce = 1608 ppm. Petrographic analysis allowed the identification of pyrolusite as the manganese mineral totaling 95% of the analyzed sample and 5% of gangue minerals.

The Mineralogy, Geochemistry and Origin of the Supergene Manganese Occurrences in the Southern Minas Gerais, Brazil

“…In 2017, the largest global Mn reserves were described in Brazil (272 Mt-32.3%), South Africa (200 Mt-23.7%), Ukraine (140 Mt-16.6%), Australia (91 Mt-10.8%), India (52 Mt-6.2%), China (43 Mt-5.1%), Gabon (22 Mt-2.6%) and Ghana (12 Mt-1.4%), totaling 98.8% of the world's total reserves [14]. Regarding Brazil, the average Mn content reaches 32.5%, with Minas Gerais (MG-181.2 Mt), Pará (PA-69.3 Mt), Amapá (AM-9.7 Mt) and Mato Grosso do Sul (MS-7.5 Mt) being the states with the largest national reserves [14]. The Brazilian Mn production in 2021 is concentrated in PA (720,182 t), followed by MG (346,475 t) and MS (271,011 t) [15].…”