Using geophysical methods to characterize an abandoned uranium mining site,Portugal |
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| Authors: | E Ramalho J Carvalho S Barbosa FA Monteiro Santos |
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| Institution: | 1. Instituto Nacional de Engenharia, Tecnologia e Inovação, Apartado 7586, 2721-866 Amadora, Portugal;2. EDM, Rua Sampaio e Pina, 1-7.°, 1070-248 Lisboa, Portugal;3. Universidade de Lisboa, Centro de Geofísica da Universidade de Lisboa-IDL, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal;1. Campus Tecnológico e Nuclear, Instituto Superior Técnico (CTN/IST), Universidade Técnica de Lisboa, EN10 (km 139.7), 2695-066 Bobadela LRS, Portugal;2. Departamento de Geociências, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal;3. GeoBioTec Research Centre, Universidade de Aveiro, Portugal;1. University of Lisbon, Instituto Dom Luiz, Lisboa, Portugal;2. EDM, Empresa de Desenvolvimento Mineiro, SA, Portugal;3. IMAR, Department of Earth Sciences, University of Coimbra, Portugal;1. Ghent University, Department of Analytical Chemistry, Krijgslaan, 281-S12, B-9000 Ghent, Belgium;2. Ghent University, Department of Materials and Science Engineering, Technologiepark, 903, B-9052 Zwijnaarde (Ghent), Belgium;1. Cooperative Major in Nuclear Energy, Waseda University, Tokyo 169-8555, Japan;2. Department of Nuclear Engineering and Management, The University of Tokyo, Tokyo 113-8656, Japan;1. Radiation Medicine Program, Princess Margaret Cancer Centre – University Health Network, Department of Radiation Oncology, University of Toronto, Canada;2. Département de radio-oncologie, Centre hospitalier de l’Université de Montréal (CHUM), Montréal, Canada;1. Department of Dermatology, Infanta Margarita Hospital, Cabra-Córdoba, Spain;2. School of Medicine, Granada University, Granada, Spain |
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| Abstract: | A major plan for Portugal Mainland is being envisaged to use old open pits from abandoned uranium mining sites as “Waste Containment Deposits”. These areas will store mining waste from other adjacent mines. The old mining sites classification to this kind of usage is carried out accordingly to its location, accessibility, geological and hydrogeological conditions. Mining waste deposition in the open pits may however cause environmental problems related with geological and hydrogeological features that must be predicted and prevented before a particular site is chosen. Therefore, the identification of faults and conductive zones that may promote groundwater circulation and the spread of contaminated waters is of great importance, since the surrounding area is highly populated. The possible negative environmental impacts of the presence of such potential waste disposal sites are therefore being assessed using geophysical methods and geological outcrop studies in several geological and hydrogeological critical areas. The abandoned Quinta do Bispo uranium mine is one of such places. This old open pit, chosen as one of the sites to be used in the near future as a “Waste Containment Deposit” (accordingly to the above mentioned criteria), needs to be characterized at depth to prevent any possible negative environmental impacts. Thus, the acquisition, processing and interpretation of electromagnetic, electrical and both seismic refraction and reflection have been carried out. 2D schematic models have been constructed, showing alteration and faults zones at depth. These fault zones control groundwater circulation and therefore, future water circulation problems with negative environmental impact may be predicted and prevented. |
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