73 documents found, page 1 of 8
Advanced monitoring of abandoned mining sites with High-Resolution UAV Technology
Barroso, Ana Raquel; Henriques, Renato F.; Cerqueira, Ângela; Gomes, Patrícia; Antunes, Isabel Margarida Horta Ribeiro; Marinho Reis, A. Paula[Excerpt] In the past decade, unmanned aerial vehicles (UAVs), or drones, have become invaluable tools in the mining industry, supporting applications ranging from mineral exploration to environmental remediation. When equipped with high resolution image sensors, UAVs enable high spatial and temporal resolution surveying, making them particularly effective for monitoring abandoned mining sites. This paper prese...
Improved acidity estimation by integrating comprehensive dissolved metal(oid)s ...
Barroso, Ana Raquel; Cravotta III, Charles A.; Gomes, Patrícia; Antunes, Isabel Margarida Horta Ribeiro; Marinho Reis, A. PaulaThis study introduces a geochemical modeling approach using PHREEQC to improve the accuracy of acidity estimates in waters influenced by acid mine drainage (AMD). AMD, common in regions like the Iberian Pyrite Belt, is characterized by low pH and high concentrations of metals, sulfate and acidity. Conventional methods, such as net acidity, often underestimate actual acidity by excluding additional metal(oid) s ...
Secondary mineralogy in mine waste: geochemical and environmental controls acro...
Valente, Teresa Maria Fernandes; Barroso, A.; Marinho Reis, A. Paula; Gomes, P.; Antunes, Isabel Margarida Horta Ribeiro[Excerpt] The mineralogical evolution of mine waste under supergene conditions reflects complex interactions among the original paragenesis, climatic regime, environmental setting, and anthropogenic influences resulting from exploitation, beneficiation, and closure methods. This study characterizes secondary mineral assemblages formed in diverse mine waste environments, using case studies from northern to south...
Assessing microplastic pollution in horticultural soils under greenhouse cultiv...
Torre, A.; Gonçalves, L.; Valente, Teresa Maria Fernandes; Henriques, Renato F.; Davim, J.; Ferreira, J. G.; Macedo, J.; Pires, A.; Silva, A. C.[Excerpt] The widespread use of plastic materials in intensive agriculture, including greenhouse covers and irrigation systems, raises increasing concerns regarding microplastic (MP) contamination in terrestrial ecosystems. This study aims to characterize and quantify microplastics in greenhouse agricultural soils in the Minho region of northern Portugal, an area of intensive horticultural production. The main ...
Acid mine drainage and waste dispersion in legacy mining sites: an integrated a...
Barroso, Ana; Henriques, Renato; Cerqueira, Ângela; Gomes, Patrícia; Antunes, Isabel Margarida Horta Ribeiro; Marinho Reis, A. PaulaAbandoned mines pose environmental risks due to the accumulation of sulfide-rich waste, which generates acid mine drainage and produces fine-grained, unconsolidated materials that, when deposited on steep slopes, accelerate erosion and contaminant transport. This study assesses the environmental impact of the Trimpancho mining complex by integrating UAV-based photogrammetry, water analysis, and mine waste chara...
A data-driven high-accuracy modelling of acidity behavior in heavily contaminat...
Barroso, Ana; Valente, Teresa Maria Fernandes; Marinho Reis, A. Paula; Antunes, Isabel Margarida Horta RibeiroAccurate estimation of water acidity is essential for characterizing acid mine drainage (AMD) and designing effective remediation strategies. However, conventional approaches, including titration and empirical estimation methods based on iron speciation, often fail to account for site-specific geochemical complexity. This study introduces a high-accuracy, site-specific empirical model for predicting acidity in ...
Mineralogical and geochemical constraints on gold enrichment in the Tchiquele E...
Kumoleha, A.; Nogueira, P.; Pimenta, P.; Marinho Reis, A. PaulaThis study investigates the Tchiquele gold deposit in south-ern Angola, a geologically prospective region with limited prior research despite its recognised mineral potential. By integrating geochemical, mineralogical, and metallographic analyses, the research aims to provide new insights into the metallogenetic evolution of the area, contributing to the broader understanding of hydrothermal gold systems in sub...
Copiapite group: occurrence and properties in mining contamination scenarios
Barroso, Ana; Valente, Teresa Maria Fernandes; Antunes, Isabel Margarida Horta Ribeiro; Marinho Reis, A. Paula; Neves, Isabel C.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 (P...
Mineralogical and geochemical constraints on gold enrichment in the Tchiquele E...
Kumoleha, A.; Nogueira, P.; Pimenta, P.; Marinho Reis, A. PaulaThis study investigates the Tchiquele gold deposit in south-ern Angola, a geologically prospective region with limited prior research despite its recognised mineral potential. By integrating geochemical, mineralogical, and metallographic analyses, the research aims to provide new insights into the metallogenetic evolution of the area, contributing to the broader understanding of hydrothermal gold systems in sub...
Mineralogical and geochemical characterization of surface soils and waste piles...
Costa, Óscar; Marinho Reis, A. Paula; Nogueira, Pedro; Simões, Pedro Pimenta; Kumoleha, A.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) equipm...