Our services of geophysics are directly linked to field data collection. Surveys are carried out with various instruments according to the most appropriate geophysics method for your project.
Here is the list of the main surveys carried out by Géophysique TMC :
Used as a basic geophysical tool, this method enables to measure the magnetic susceptibility contrasts of rock formation and thus to trace the geologic image of a sector.
Electromagnetic survey (HEM)
It permits to detect conductors as deep as 150 and to specify their physical properties through the use of an extended range of frequencies (110 – 14 080 Hz) and variable transmitter-receiver separations.
Induced Polarization (IP)
It is especially efficient for the detection of disseminated mineralization through the use of spacing and variable electrode arrangements. The various configurations enable us to conduct surveys more than 500 meters underground. This method also permits to highlight rock resistivity contrasts (silicified zone, shearing zone, etc).
Surface TDEM (Crone Deep-EM)
Operating in the field of time and using large transmitter loops fed by a powerful transmitter (4 kW), this deep-investigation method enables to detect conductors buried as deep as 300 to 400 m, depending on the configuration used and the dimension of desired targets.
Borehole TDEM (Crone Pulse-EM)
It allows determining the presence of mineralized conductive zones around a drill hole within a radius which can reach 200 m, regardless of the drill-hole depth. This method makes the cost of drilling profitable through the provided information and by permitting to increase the drill grid.
Measurements of the gravitational field in a series of different locations on an area of interest. The objective of exploration works is to associate variations with differences in the distribution of densities, and hence rock types. The gravity measurements provide information about the densities of underground rock. There is a wide range of density between types of rocks, therefore geologists can make inferences about the distribution of strata.
Geophysical technique that provides information about the distribution of electrical conductivities
of underground rocks. This is a method of electromagnetic exploration where electric currents, of natural or artificial origin, continuously scour the basement. Their variations induce magnetic fields which can be detected on the surface. The magnetotellurics are particularly suitable for search of metal ores and study of geothermal sites and hydrocarbons.
TMC carries out conventional or very high resolution land reflexion or refraction seismic data acquisition campaigns, using sources of all types (dynamites, weight drop or vibratory).