Geophysical Mineral Exploration

The application of geophysical techniques to explore and evaluate mineral deposits beneath the Earth’s surface. These surveys are crucial in the early stages of mineral exploration, helping to locate potential ore bodies, map geological structures, and guide drilling programs—all without extensive or invasive ground disturbance.

Electromagnetic (EM) Survey

We induce an electrical current into the ground to measure its conductivity. This is highly effective for finding metallic minerals that conduct electricity.

Magnetic Survey

We detect variations in the Earth’s magnetic field caused by magnetic minerals (like magnetite or pyrrhotite). These can be conducted from the air (aeromagnetic) or on the ground.

Gravity Survey

We measure minute differences in the Earth’s gravitational pull. Higher gravity often indicates dense ore bodies (like massive sulfides), while lower gravity might indicate porous or less dense rock.

Seismic Survey

NGV Geotechnical sends sound waves into the ground and records how they reflect or refract off different rock layers. This is primary for mapping deep structural features.

Induced Polarization (IP)

NGV Geotechnical measures the ground’s ability to hold an electrical charge (like a battery). It is a primary tool for finding “disseminated” ore bodies, such as gold and copper porphyries.

Key Advantages

Comprehensive Subsurface Imaging: Geophysics provides a continuous picture of the subsurface, helping to create detailed 2D and 3D models. This is a major advantage over isolated point data from boreholes, as it allows for the identification of subtle geological features, buried hazards, and structural variations that might be missed otherwise.
Cost and Time Efficiency: Compared to traditional methods like extensive drilling programs, geophysical surveys can be much cheaper and faster. They allow for the rapid collection of a high volume of data over a large area, which helps pinpoint the best locations for subsequent, more expensive direct investigations like boreholes. This reduces the need for unnecessary drilling, saving both time and money.

Non-Invasive and Non-Destructive: Geophysical surveys use indirect measurements, meaning they don’t require excavation or drilling. This is a huge benefit for projects in environmentally sensitive areas, urban settings, or on sites with historical significance, as it minimizes environmental impact and avoids damaging infrastructure.