**Acknowledgements**

*Magnetometers - Fundamentals and Applications of Magnetism*

structure. It is represented in an aeromagnetic map by the magnetic lows (blue color) the pit area and magnetic highs (color red). Thus, La Dulcita area is located in the limits of three aeromagnetic domains, which already indicates in ground magnetic measurements and should necessarily have a magnetic susceptibility contrast that will be reflected with significant differences in the amplitude of the

*The graphs that support the existence of a fractured area and with humidity in the underground are shown. The magnetism intensity graph (a) shows a clearly fractured zone towards the NW portion of the section. In the geoelectric profile (B), a contrast in resistivity is observed towards station 400, it decreases to openings of AB/2 = 200 m with respect to AB/2 = 100 m. the SEV 3 (C) shows association with type H curves.*

The ground magnetic sections indicate the zones that can be associated with permeability and the zones that do not have association with this physical property. The magnet simile is parameter for the interpretation of fracture in the underground. It will generate a simple anomaly if not related with fracture and provide a series of anomalies, which will be characterized by high frequencies. The calculation of the horizontal gradient of the magnetic field is completely resolutive to be able to observe fractured (permeable) zones of relatively healthy zones. In the magnetic section 1, the different physical behaviors that exist in the underground are clearly shown in the first portion of a highly fractured area contrasted with the rest of the section, which indicates that the magnetic susceptibilities of each

With the aerial and terrestrial magnetism, it was easy to find areas with high

In the area that was most likely to be associated with permeability and humidity in the underground (**Figure 20**) where a drilling was carried out by the State Water

With the electrical sections, it was possible to quickly scan the areas with possibilities of being associated with permeability and verify if they could also be associated with humidity. Producer well is key to facilitating the interpretation of vertical electric soundings, which in order to be associated with humidity should

terrestrial magnetic domains are associated with different units.

possibilities of being associated with fracturing (permeability).

have as part of their morphology a portion type H.

**42**

magnetic field.

**Figure 20.**

This work was funded by the State Water Commission, San Luis Potosí and COPOCYT-SLP. My sincere gratitude goes to Ing. Víctor J. Martínez Ruíz for his support to drawing geological map. I also thank David E. Torres Gaytán for his contribution in the preparation of this work. Also my sincere gratitude to Dr., Sanjeet Lumar Verna and Lucia Aldana Navarro for their comments on writing.
