CORDIS proporciona enlaces a los documentos públicos y las publicaciones de los proyectos de los programas marco HORIZONTE.
Los enlaces a los documentos y las publicaciones de los proyectos del Séptimo Programa Marco, así como los enlaces a algunos tipos de resultados específicos, como conjuntos de datos y «software», se obtienen dinámicamente de OpenAIRE .
Resultados aprovechables
A new geochemical methodology has been developed for the exploration of deep metalliferous ores. It involves detecting modifications to the chemical composition of groundwater induced by the vicinity of an orebody. Its validation is based on geochemical, hydrogeological, mineralogical, geological and environmental investigations carried out over and around two massive sulphide deposits located in the South West Iberian Pyrite Belt (SWIPB): La Zarza and Masa Valverde.
The methodology has also required the development of high-performance sampling and analytical tools. Thus a Voltammetric In situ Probe (VIP) for in situ metal (Cu, Pb, Zn, Cd, Fe, Mn) detection has been miniaturized to 75 mm diameter, and a new device has been built for sampling water in small-diameter exploration boreholes at selected depths to 450 m without any risk of metal contamination during the procedure. The field sampling programme for groundwater analysis at the two sites was undertaken using these tools. The analyses concerned both major and trace elements. Metals (Cu, Pb, Zn, Cd, Fe, Mn) were determined in situ in some boreholes by using the VIP, but analysis for these metals, as well as for As, Ni and Co, were also performed by ICP-MS in the laboratory after sampling. Comparison between the VIP and ICP-MS results indicates that a large part of the metals in groundwater are present in form of complexes with organic matter and/or adsorbed onto colloids and/or small particles.
Orebody and host-rock characterization was carried out on the basis of petrographic and mineralogical observation, as well as chemical analysis. Compiled hydrogeological and metal-source maps of the sites highlight possible water and metal transfers from and towards the deposits and their subsequent influence on the chemical composition of groundwater in the vicinity of the deposits.
Application of the EQ3/6 software code to the chemical composition of the groundwaters in the proximity of and in the vicinity of the La Zarza and Masa Valverde deposits has made it possible to demonstrate the minerals with which the waters interact, and to confirm the important influence that organic matter or even thiosulphates and colloids have on the measured metal concentrations, significantly enhancing the measured concentration by up to several orders of magnitude. These results also indicate that the VIP probe is not yet totally operational for exploration, as it measures only truly dissolved metals, which are not detectable in some samples. Provided further modifications/developments are performed on the VIP probe, it will be a very useful tool for exploration as it measures the metals of interest for the methodology and represents a significant time saving, thus enabling an increased amount of data to be obtained.
The synthesis of all the results has led to the identification of indicators of deposit proximity. These are particularly useful for the implementation of the exploration methodology.
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