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- Copiapite group: occurrence and properties in mining contamination scenariosPublication . Barroso, Ana; Valente, Teresa; antunes, Isabel Margarida; Reis, Amelia; Correia Neves, IsabelABSTRACT: The copiapite group shows a wide range of chemical compositions, allowing the identification of several mineral phases (e.g., aluminocopiapite and magnesiocopiapite). These minerals, typically observed in mining environments, are formed from evaporation and acid mine drainage (AMD) precipitation. In these areas, the copiapite has been studied to comprehend its ability to store some potentially toxic elements (PTE), specifically the As. Therefore, the present work aims to characterize mineral samples of copiapite using different techniques (binocular microscope, XRD, SEM-EDS, and FTIR) to understand their morphology, mineralogical and chemical composition, and environmental role. Copiapite samples were collected in two abandoned mining areas of the Iberian Pyrite Belt (IPB): São Domingos (Portugal) and Trimpancho (Spain). The results from the mining areas showed differences corresponding to two phases of the copiapite group, expressed by distinct occurrence modes and variations in morphology and chemical composition.
- Mineralogical and geochemical characterization of surface soils and waste piles collected in the Preguiça-Vila Ruiva mining areaPublication . André da Silva Costa, Óscar Filipe; Reis, Amelia; Nogueira, Pedro; Simões, Pedro Pimenta; Kumoleha, A.ABSTRACT: The Preguiça and Vila Ruiva mines, located in the Ossa Morena Zone, Beja district, were explored for Fe-Zn-Pb in the early and mid-20th century. This study aims to reassess their mining potential by creating geochemical maps using modern exploration techniques combined with petrographic and mineralogical analyses. These maps resulted from field measurements obtained by portable X-ray fluorescence (XRF-P) equipment. The geochemical mapping shows that the Zn, Pb, and Fe anomalies correspond to the waste rock piles presenting, however, variations in their spatial distribution. Spatially concordant anomalies of Fe, Co, Cr, and V were detected in the soil NW of the Preguiça mine.