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Acid mine drainage from the Panasqueira mine and its influence on Zêzere River (Central Portugal)
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Orientador(es)
Resumo(s)
The Panasqueira hydrothermal mineralization, located in central Portugal, is the biggest Sn–W deposit
of the Western Europe. The main evidences of the mining exploitation and ore treatment operations
are testified with huge tailings, mainly, in the Rio and Barroca Grande areas. The mining and benefi-
ciation processes, at the site, produces metal rich mine wastes. Oxidation of sulfides tailings and flow
from open impoundments are responsible for the mobilization and migration of metals from the mine
wastes into the environment. Acid mine drainage (AMD) discharged from Rio tailing has a pH around
3 and high metal concentrations. In Zêzere river, Fe and As are the most rapidly depleted downstream
from AMD once As adsorbs, coprecipitate and form compounds with iron oxyhydroxides. The Zêzere
river waters are oversaturated with respect to kaolinite and goethite and ferrihydrite can precipitate
on stream with a near-neutral pH. At sites having low pH the dissolved Fe species in the water,
mainly, occur as sulfate complexes due to a high SO4 concentration. Melanterite (Fe2+(SO4)7(H2O))
and minor amounts of rozenite (Fe2+(SO4)4(H2O)) and szomolnokite (Fe2+(SO4)(H2O)) were observed
on Rio tailing basement.
Descrição
Palavras-chave
Mining Areas Acid Mine Drainage Geochemical Modeling Hydrogeochemistry Mineralogy Panasqueira Mine Ar e Saúde Ocupacional Genotoxicidade Ambiental
Contexto Educativo
Citação
J Afr Earth Sci. 2014; 99:705-12. Doi: 10.1016/j.jafrearsci.2013.10.006. Epub 2013 Oct 25
Editora
Elsevier