136 documents found, page 1 of 14
The geochemical behavior of Pb and Zn in waters and stream sediments around a f...
Carvalho, Paula; Antunes, I.M.H.R.; Albuquerque, Maria Teresa; Santos, AntónioIn Portugal, ore mineral exploitation has left millions of tons of mining waste rich in metals in the environment. The former Várzea Pb-Zn mine is located in the Várzea dos Cavaleiros village, about 10 km from Sertã village and 65 km from Castelo Branco county, central Portugal. The Pb-Zn quartz vein with N10ºW; 75º SW orientation, 0.5-1.5 m thick, intruded the Neoproterozoic-Cambrian schist-greywacke complex. ...
Stream sediments as a repository of U, Th and As around abandoned uranium mines...
Carvalho, Paula; Antunes, I.M.H.R.; Albuquerque, M.T.D.; Santos, António; Cunha, Pedro ProençaThis work focuses on the study of water–sediment interaction around abandoned uranium mines with open-pit lakes and mine dumps. Nineteen water and eleven stream sediment samples were collected in the abandoned Barrôco D. Frango mine, central Portugal. The trace element distribution was compared with other abandoned uranium mines in Portugal and worldwide. Generally, U, Th, and As contents in the open-pit water ...
Mobility of uranium in groundwater-surface water systems in a post-mining conte...
Antunes, I.M.H.R.; Carvalho, Paula; Albuquerque, Maria Teresa; Santos, A.C.T.In uranium abandoned mine areas, particularly with mine tailings and open-pit lakes, the mobility of potentially toxic elements still acts as a source of surface and groundwater contamination. e water of open-pit lakes from Ribeira de Bôco mine and associated groundwater and surface water from the area is neutral and with low metal contents. However, some water samples are contaminated with Cd, Cr, Cu, Fe, Mn, ...
Effects of wastewater treatment plant’s discharges on a freshwater ecosystem: a...
Almeida, Pedro Dinis Nunes; Albuquerque, M.T.D.; Antunes, I.M.H.R.; Ferreira, Ana Maria; Pelletier, GregorySewage discharges constitute severe stress in freshwater ecosystems. The Ramalhoso River belongs to the Tagus River watershed and was chosen for a pilot study on the impact of wastewaters discharges in a freshwater ecosystem and its ability for self-depuration. Twelve water samples were collected along the river and were georeferenced. The first point is located upstream of the first discharge point, the second...
Water-rock interaction and potential ontamination risk in a U-enriched area
Antunes, I.M.H.R.; Teixeira, Rui; Albuquerque, M.T.D.; Valente, Teresa; Carvalho, Paula; Santos, AntónioThe Picoto mining area is in the village of Vilar Seco (Viseu), central Portugal. Mineralization occurs mainly in quartz veins with meta-torbernite and uranophane and some U-bearing minerals, cutting a Variscan granite. Exploitation took place in two phases, between 1917 and 1953, and since the closure, the area has never been remediated. Water–rock interaction processes, including the mobility of potentially t...
DRASTICAI: a new index for groundwater vulnerability assessment:a portuguese ca...
Albuquerque, M.T.D.; Roque, Natália; Rodrigues, Joana; Antunes, I.M.H.R.; Silva, C.Groundwater vulnerability assessment has become a useful tool for groundwater pollution prevention. Groundwater vulnerability maps provide useful data for protecting groundwater resources. Identification of agricultural patterns is an important issue for optimized land management. The watershed of the Tagus River is the backbone of this study. Naturtejo UNESCO Global Geopark, in the central interior of Portugal...
Spatial mobility of U and Th in a U-enriched area (Central Portugal)
Antunes, I.M.H.R.; Santos, António; Valente, Teresa; Albuquerque, M.T.D.Uranium and thorium are toxic in different environments. The exploitation of uranium mines and associated mine drainage leaching towards streams, sediments, and soils cause relevant pollution. The U-mine areas present high concentrations of potentially toxic elements with several consequences to ecosystems and human health. Physicochemical and potentially toxic elements of mine dumps, stream sediments, and soil...
Predicting ore content throughout a machine learning procedure: an Sn-W enrichm...
Iglesias, Carla; Antunes, I.M.H.R.; Albuquerque, M.T.D.; Martínez, JavierThe distribution patterns of trace elements are very useful for predicting mineral deposits occurrence. Machine learning techniques were used for the computation of adequate models in trace elements’ prediction. The main subject of this research is the definition of an adequate model to predict the amounts of Sn and W in the abandoned mine area of Lardosa (Central Portugal). Stream sediment samples (333) were c...
Groundwater vulnerability assessment in the Naturtejo UNESCO Global Geopark, Po...
Albuquerque, M.T.D.; Roque, Natália; Rodrigues, Joana; Antunes, I.M.H.R.; Catarina, SilvaNowadays, groundwater vulnerability assessment has become a useful tool for groundwater contamination prevention. Groundwater vul-nerability maps provide useful data to protect groundwater resources and work as a tool for the improvement of changes in agricultural patterns and land use applications. The study area of this research survey is the Naturtejo UNESCO Global Geopark, located in central inland Portugal...
New thermal mineral water from Aguas (Penamacor, Central Portugal): hydrogeoche...
Gomes, L. Ferreira; Antunes, I.M.H.R.; Albuquerque, M.T.D.; Silva, A. SantosThermal mineral waters are a potential resource in the local and economic development of a region. The thermal area of Termas das Águas is in the inner region of central Portugal and its grant will enable the exploration and exploitation of this water resource for medical and therapeutic purposes through a thermal medical SPA. In Portugal, the classification and legalization of a thermal unit must provide a nat...