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The industrial brownfield site of Montagne-du-Nord (France) is home to zinc metallurgy and lead and sulphuric acid manufacturing activities. Hydrological and geochemical studies were carried out in pits and boreholes after the site had been shaved and covered by backfilling. Geophysical data (slingram electromagnetic mapping, 2D and 3D electrical panel, and electrostatic dideshy) make it possible to locate ground and mineral water, to position interfaces between layers, to identify where water is released to river drains and to characterise the unsaturated area, with good spatial resolution. ; International audience The industrial waste land in Montagne-du-Nord (France) has been occupied by a zinc and a lead smelter unit linked to sulphuric acid production. Then this factory has been razed and covered by coarse waste deposits below sandy fillings. Hydrological and geochemical studies have been systematically carried out by drillings and pits following a mesh of 50m x 50m. This waste land constitutes an area where the metallic contamination is important. The physical property of subsoil materials, sensitive to this contamination, is the electrical resistivity; it depends on water mineralization and quantity presented in all formations. Geophysical data allow to locate precisely mineralized soil and water with higher spatial resolution. A complete geophysical study, using methods based on electrical resistivity (slingram electromagnetic mapping, 2D and 3D electrical imaging, and electrostatic logging) has been carried out. The slingram mapping allows to determine conductive anomalies coincident with chemical anomalies obtained into the piezometers, and to locate the water seepage toward the river drain. The electrical imaging allows to indicate precisely the location of clayey alluvial deposits, and to describe the superficial seepage areas. The electrostatic logging gives an accurate description of the not saturated area in boreholes, near anomalies located with the two other methods. Those geophysical ...

The utilization of induced courents in the subsoil has currently constítuted an outstanding point in the development of complex systems, capable to quantitatively assess the electrical charge conduction level by a determinated ground volume. This study analizes the response, as a physical sign, by certain devices based in the physics principie of induction (magnetic dipoles) with regard to archaeological structures and certain elements that once were part of the surroundings of one of the most important political - religious sites of the mesoamerican civilization. As a specific case, the response of a paleochannel obtained in the western zone of the Conjunto Principal de Copán - Ruinas, Honduras, is presented. ; La utilización de corrientes inducidas en el subsuelo ha constituido, hoy día, un punto muy importante en el desarrollo de instrumentos complejos, capaces de cuantificar el nivel de conducción de carga eléctrica a través de un determinado volumen de terreno. En este trabajo se analiza la respuesta, como señal física, de ciertos dispositivos electromagnéticos basados en el principio fisico de inducción (dipolos magnéticos), ante la presencia de estructuras arqueológicas y ciertos elementos que formaron parte de los alrededores de uno de los centros político— religiosos más importantes de toda la civilización mesoamericana. Se presenta, como caso específico, la respuesta de un paleocanal obtenida en la zona oeste del Conjunto Principal de Copán - Ruinas, Honduras.