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- W3143661256 abstract "The active Panasqueira mine is a Sn-W mineralization hosted by metasediments with quartz veins rich in ferberite. The economic exploitation has been focused on wolframite, cassiterite and chalcopyrite. The mineralization also comprises several sulphides, carbonates and silver sulphosalts. The mining and beneficiation processes produces arsenic-rich mine wastes laid up in two huge tailings and open impoundments, one deactivated and the other (Barroca Grande tailing) still active. the rejected materials from the ore processing, containing high concentrations of metals, stored in the open-air impoundments are responsible for the continuous generation of acid drainage. Average contents (mg kg-1) in Barroca Grande impoundment of As=44252, Cd=491, Cu=4029 and Zn=3738 and in Rio impoundment As=73649, Cd=1227, Cu=2497 and Zn=6843 were determinate. DRX analysis reveals the existence of arsenopyrite, ferberite and natrojarosite in the course materials and scorodite, arsenopyrite, sphalerite pyrite, chalcopyrite, ferberite and hematite are still present in the fine grained materials existing in those opens impoundments. The unconfined tailings and open impoundments are the main source of pollution in the surrounding area once the oxidation of sulphides can result in the mobilization and migration of trace metals from the mining wastes into the environment, releasing contaminants into the ecosystem." @default.
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- W3143661256 date "2012-01-01" @default.
- W3143661256 modified "2023-09-27" @default.
- W3143661256 title "Heavy metal pollution in Mine-Soil-Plant System in S.Francisco de Assis - Panasqueira mine (Portugal)" @default.
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