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CHARACTERIZATION OF ACID MINE DRAINAGE AT THE REGOUFE MINE, AROUCA GEOPARK, NORTHERN PORTUGAL
Abstract
The abandoned Regoufe mine is situated in Northern Portugal, in the Arouca Geopark. It was exploited for tungsten by underground mining till the 1970s. The tailings were deposited on the ground. The mine was abandoned without any environmental remediation. Mineralization occur in quartz veins, and consists of wolframite, cassiterite, and several sulfides (arsenopyrite, pyrite, sphalerite), bismuthinite and native bismuth (Bi). The present study aims to characterize the acid mine drainages (AMD) and superficial waters at the Regoufe mine area, based on a bimonthly monitoring scheme for a year. Portable instruments were used to measure water pH, Eh, temperature and electric conductivity (EC) in situ. HCO3 was also measured in situ using the titration method. Laboratory analyses were performed using current analytical methods: atomic absorption spectrometry (AAS) for Ca, Mg, Na and K; coupled graphite furnace AAS for Fe, Mn, Cu, Zn, Cd, Co, Ni, Pb and As; the spectrophotometric method for Cl; SO4 was analyzed by gravimetry. Mine drainage at the Regoufe mine have low pH and significant concentrations of SO4 (444 mg/L), arsenic (669 ?g/L) and metals (e.g., 304 ?g/L Mn; 269 ?g/L Zn; 32.3 ?g/L Cd), while in the superficial natural stream waters outside the mine influence the conductivity and metal concentrations are lower and the pH is close to neutral. The stream waters inside the mine influence have chemical composition between AMD and natural stream waters outside mine influence.
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References6
Favas P.J.C., Pratas J. & Gomes M.E.P. Hydrochemistry of superficial waters in the Adoria mine area (Northern Portugal): environmental implications. Environmental Earth Sciences, 65: 363 372, 2012.
Favas P.J.C., Sarkar S.K., Rakshit D., Venkatachalam P. & Prasad M.N.V. Acid mine drainages from abandoned mines: hydrochemistry, environmental impact, resource recovery, and prevention of pollution. In: M.N.V. Prasad, S. Kaimin (Eds.). Environmental materials and waste: Resource recovery and pollution prevention. Elsevier Academic Press, pp 413 462, 2016.
Sluijk, D. Geology and tin-tungsten deposits of the Regoufe area, Northern Portugal. PhD Thesis, Universiteit van Amsterdam, 123 p., 1963.
Favas, P.J.C. Biogeoquímica em áreas mineiras estano-volframíticas. PhD Thesis, University of Trás-os-Montes e Alto Douro, Vila Real, 805 p., 2008.
Pereira, E., Gonçalves, L.S.M. & Moreira, A. Notícia Explicativa da Folha 13-D, Oliveira de Azeméis, da Carta Geológica de Portugal na escala de 1/50 000. Lisboa: Serviços Geológicos de Portugal, 68 p., 1980.
Ficklin, W.H., Plumlee, G.S., Smith, K.S. & Mchugh, J.B. Geochemical classification of mine drainages and natural drainages in mineralized areas. In: Kharaka, Maest (Eds.). Water-Rock Interaction - Volume 1: Low Temperature Environments. Balkema, pp 381 384, 1992.
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