RM - Artigos em revistas internacionais
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Browsing RM - Artigos em revistas internacionais by Field of Science and Technology (FOS) "Ciências Naturais::Ciências da Terra e do Ambiente"
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- Chemical and Mineralogical Characterization ofWaste from Abandoned Copper and Manganese Mines in the Iberian Pyrite Belt, Portugal: A First Step Towards the Waste-to-Value Recycling ProcessPublication . de Oliveira, Daniel Pipa Soares; Silva, Teresa; Morais, Igor; Fernandes, JoãoABSTRACT: This study examines the chemical and mineralogical composition of waste materials from abandoned copper and manganese mines in the Iberian Pyrite Belt, Portugal, as a first step toward their potential recycling for critical and strategic raw materials (CRM and SRM). Using portable X-ray fluorescence (pXRF) and other analytical techniques, this research highlights the presence of valuable elements, including copper, manganese, and rare earth elements, in concentrations significantly above their crustal abundance. The findings underscore the dual potential of these wastes: as sources of secondary raw materials and for mitigating environmental hazards such as acid mine drainage (AMD). Recovered materials include chalcopyrite, pyrolusite, and rhodochrosite, with critical elements like cobalt, lithium, and tungsten identified. pXRF proved to be a reliable, cost effective tool for rapid field and laboratory analyses, demonstrating high precision and good correlation with standard laboratory methods. The study emphasizes the importance of characterizing historical mining waste to support a circular economy, reduce reliance on foreign material imports, and address environmental challenges. This approach aligns with the European Union’s Critical Raw Materials Act, promoting sustainable resource use and the recovery of strategic resources from historical mining sites.
- Decision criteria for the exploration of ornamental-stone deposits: Application to the marbles of the Portuguese Estremoz AnticlinePublication . Falé, Patrícia; Carvalho, Jorge; Henriques, Paulo; Luís, GabrielABSTRACT: Ornamental stones are almost ready-made raw materials with a high economic value for the building-construction industry. The discovery of new near-surface deposits, the very low exploitation efficiency, the huge amounts of wastes produced, and the land-use accessibility conditions are the main challenges that the extractive industry for this mineral resource is facing nowadays. Research on advanced geological exploration tools and methodologies is needed to reply to those challenges. During the process of geological ornamental-stone deposits exploration, the unique and decisive criteria that should be considered are its dimensions, homogeneity, and fracturing state. Lithostructural geological mapping and in situ fracturing surveys are the basic indispensable tools for their field assessment. By applying these criteria and tools to a marble-rich area in the Portuguese Estremoz Anticline and a step-by-step numerical evaluation of the qualitative geological parameters, the delimitation of the best target areas for exploitation or environmental rehabilitation has been effectively mapped.
- The Geological Survey Organisations in delivering Critical Raw Materials autonomy through a Geological Service for EuropePublication . Hollis, Julie; Albert, Capucine; Bertrand, Guillaume; Cabidoche, Marina; de Oliveira, Daniel Pipa Soares; Dobnikar, Meta; Teran, Klemen; Tulstrup, JørgenABSTRACT: Europe’s dependence on foreign-sourced critical raw materials poses a significant threat to its strategic autonomy and competitiveness. In this paper, we examine the historical significance of mining in Europe, the current geopolitical complexities surrounding critical raw materials supply, and recent EU policy initiatives aimed at bolstering domestic critical raw materials production and processing and building resilient supply chains. We highlight the crucial role of National Geological Survey Organisations in delivering knowledge of Europe’s critical raw materials potential, as well as contributing to international partnerships through technical engagement and geoscientific diplomacy. National Geological Survey Organisations collect and compile data on mineral resources, often serving as a primary resource for national and regional decision-making. This work is now crucial at EU level, with National Geological Survey Organisations mandated under the EU Critical Raw Materials Act to deliver National Exploration Programs to promote exploration investment through technical de-risking, and to coordinate efforts and geoscientific data and knowledge management at pan-European level. The National Geological Survey Organisations already share knowledge and best practices on European mineral resources through EuroGeoSurveys. Future efforts to secure European critical raw materials resilience will be served through their shared vision of a Geological Service for Europe.