Quality: low calorific value and high ash (47 to 58%) and sulfur (1 to 4.7%) contents (jica, 1995). the main activities of coal mining (exploration, development, extraction, concentration, processing, refinement and deactivation) have a variety of impacts, which include soil damage, air pollution and water contamination (mcallister and milioli, 2000). areas that have been explored but not rehabilitated are a source of water pollution. this is mainly because of acid mine drainage (amd), due to pyrite oxidation (fes ). when pyrite is in contact with oxygen and water, highly concentrated

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• who: Resumo Objetivo Avaliar a et al. from the Universidade Estadual Paulista, UNESP, Av, março, Alto Boa Vista, CEP, Sorocaba, SP, Brazil have published the article: quality: low calorific value and high ash (47 to 58%) and sulfur (1 to 4.7%) contents (JICA, 1995). The main activities of coal mining (exploration, development, extraction, concentration, processing, refinement and deactivation) have a variety of impacts, which include soil damage, air pollution and water contamination (McAllister and Milioli, 2000). Areas that have been explored but not rehabilitated are a source of water pollution. This is mainly because of . . .
  

   

  

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