Affiliation: | 1. FEPAM–Funda??o Estadual de Prote??o Ambiental do Estado do Rio Grande do Sul, Rua Carlos Chagas, 55, sala 604, CEP: 90030-020, Porto Alegre, RS, Brasil 2. Mining Engineering Department, Federal University of Rio Grande do Sul, Av. Bento Gon?alves, 9500, Setor 4, prédio 75 salas 101/102/104, CEP: 91509-900, Porto Alegre, RS, Brasil
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