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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 beneficiation
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
Available online 25 October 2013
Palavras-chave
Actividade mineira Poluição do ambiente Resíduos mineiros Drenagem ácida mineira Hidrogeoquímica Minas da Panasqueira (Portugal) Rio Zêzere (Portugal) Portugal (Centro)
Contexto Educativo
Citação
Candeias, Carla... [et al.] - Acid mine drainage from the Panasqueira mine and its influence on Zêzere river (Central Portugal). In: Journal of African Earth Sciences, Vol. 99 (2014), p. 705-712