Veredas
1998-
Type
article
Identifier
ANTUNES, I.M.H.R. ; GOMES, M.E.P. ; NEIVA, A.M.R. (2013) - Caracterização e contaminação de águas associadas à mina da Fonte Santa (Bragança, Portugal). Agroforum : Revista da Escola Superior Agrária de Castelo Branco. ISSN 0872-2617. Ano 21:30, p. 23-30.
0872-2617
Title
Caracterização e contaminação de águas associadas à mina da Fonte Santa (Bragança, Portugal).
Characterization and contamination of waters related Fonte Santa mine, (Bragança, Portugal).
Characterization and contamination of waters related Fonte Santa mine, (Bragança, Portugal).
Subject
Águas
Contaminação
Fonte Santa
Mineralizações
Scheelite
Contamination
Mineralizations
Waters
Contaminação
Fonte Santa
Mineralizações
Scheelite
Contamination
Mineralizations
Waters
Date
2018-02-17T16:41:16Z
2018-02-17T16:41:16Z
2013
2018-02-17T16:41:16Z
2013
Description
Na região da mina de Fonte Santa ocorrem filões de quartzo mineralizados em W, com scheelite, que cortam quartzitos do Ordovícico Inferior aflorantes nas imediações de granitos Variscos, e que se relacionam com a zona de cisalhamento de Moncorvo-Bemposta. Alguns filões com scheelite têm quartzo recristalizado e brechificado e sulfuretos associados, tendo sido explorados para volfrâmio (W) entre 1942 e 1982. As águas relacionadas com a mina da Fonte Santa são pouco mineralizadas, com condutividade eléctrica < 965 μ S/cm, e classificadas como de tipo misto. A maioria dos valores de pH (pH = 5.0 - 8.5) indicam que não há drenagem ácida significativa associada às actividades mineiras e os valores mais ácidos (pH = 3.4) foram obtidos numa lagoa da mina. Nas águas associadas com os filões mineralizados e antigas explorações foram encontradas concentrações elevadas de Fe e Mn que proíbem o seu consumo humano e utilização na agricultura.
Abstract At Fonte Santa mine area, W-bearing quartz veins containing scheelite cut the Lower Ordovician quartzites and Variscan granites, which are related to the Moncorvo - Bemposta shear zone. Some quartz veins containing scheelite have recrystallized and brecciated quartz and sulphide and were exploited for tungsten (W), between 1942 and 1982. The waters related to Fonte Santa mine are of mixed type and poorly mineralized with electrical conductivity of < 965 µS / cm. Most pH values (5.0 and 8.5) indicate no significant acid drainage associated with the mining activities. The most acid water has pH = 3.4 and belongs to a mine lagoon. Waters associated with the mineralized quartz veins and old mining activities have high Fe and Mn concentrations that forbid their use for human consumption and agriculture.
info:eu-repo/semantics/publishedVersion
Abstract At Fonte Santa mine area, W-bearing quartz veins containing scheelite cut the Lower Ordovician quartzites and Variscan granites, which are related to the Moncorvo - Bemposta shear zone. Some quartz veins containing scheelite have recrystallized and brecciated quartz and sulphide and were exploited for tungsten (W), between 1942 and 1982. The waters related to Fonte Santa mine are of mixed type and poorly mineralized with electrical conductivity of < 965 µS / cm. Most pH values (5.0 and 8.5) indicate no significant acid drainage associated with the mining activities. The most acid water has pH = 3.4 and belongs to a mine lagoon. Waters associated with the mineralized quartz veins and old mining activities have high Fe and Mn concentrations that forbid their use for human consumption and agriculture.
info:eu-repo/semantics/publishedVersion
Access restrictions
openAccess
http://creativecommons.org/licenses/by/4.0/
http://creativecommons.org/licenses/by/4.0/
Language
por
Comments