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Geophysical methods include techniques like magnetic surveys to detect subsurface magnetic properties, gravity surveys for mapping variations in rock densities, seismic methods to analyze wave reflections for subsurface structures, electromagnetic surveys to measure electrical conductivity, and resistivity methods to assess ground resistance to electrical currents.

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IP (Induced Polarization)/Resistivity Method:

CSAMT (Controlled Source Audio-frequency Magneto-Tellurics)

TDEM (Time Domain Electro-Magnetics)

Gravity Method

Magnetics Method

GPR (Ground Penetrating Radar)

EM31, EM34, EM39, EM61 Methods

Seismic

MaxMin & VLF-EM

4-Pin Wenner Array and Resistivity Imaging

Radiodetection Method

Borehole Logging
Specialty Modes
Specialy Modes

Our methods use adapted equipment to ensure accurate data collection regardless of environmental conditions. Whether it's mapping underwater, surveying in deep snow, or navigating difficult landscapes, these modes provide flexibility and reliability in various scenarios.

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ATV-mode GPR and EM Surveys

Snowmobile-mode Cesium Magnetometer

Snowmobile-mode GPR Surveys

Snowmobile-mode IMAGEM Surveys

Wall-mode Surveys

Water-mode Surveys

Tunnel-Mode Surveys
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Borehole Seismic for Direction to Voids and Legacy Wells

Twenty-four hydrophones spaced 1-m or 5-m apart can be inserted in a single borehole do get direction to voids and other features next to the borehole.

Seismic shots are taken around around the borehole at regular intervals. The seismic shots are precisely located with a Trimble R12i RTK GPS with Can-Net subscription.

Seismic Shots Blog

It is possible to get direction by comparing shots taken from opposing directions. Shots from opposing directions are symmetrical and generally the seismic records are identical if the target void or legacy well is centred between the shots. But if the void or legacy well is closer to one of the seismic shots, it will exhibit asymetry as per the following opposing shots.

Asymmetry1

versus

Asymmetry2

The method can also detect when the borehole appears to be approaching a nearby legacy well with additional reverberations near the bottom as indicated with the red oval.

Asymmetry3

A Geonics EM31 survey carried out on surface can map potential brine solution plumes emanating from the legacy well and borehole physical property logs such as optical & acoustic televiewer, and inductive conductivity logs can provide further evidence that the borehoel is approaching or at the legacy well.