Electrical Resistivity Studies

See What Drilling Alone Cannot Tell You.

Drilling gives you a precise picture of subsurface conditions at a single point. Electrical resistivity gives you the picture between those points — mapping subsurface conditions continuously across your entire survey area, identifying anomalies that a drill programme would miss entirely unless it happened to intersect them by chance.For mine owners, infrastructure developers, and geotechnical teams working with limited investigation budgets, resistivity studies are frequently the most cost-effective way to understand what lies beneath a site before committing to a targeted drilling programme.

How It Works

Electrical resistivity measures how different subsurface materials resist the flow of electrical current. Rock, soil, water, voids, and contaminants all have distinct resistivity signatures — allowing our geophysicists to identify and map subsurface features from the surface without excavation or drilling.
Uttam Blastech deploys three resistivity techniques depending on your investigation objectives and site conditions:

2D Resistivity Profiling

Electrodes are laid out in a line across the survey area, generating a cross-sectional resistivity image of the subsurface along that profile. Ideal for mapping geological boundaries, fault zones, and groundwater conditions along a defined alignment — such as a road corridor, pipeline route, or pit wall section.

3D Resistivity Tomography

Multiple electrode arrays are deployed across a grid, generating a three-dimensional resistivity model of the subsurface beneath the survey area. Used where the spatial distribution of a subsurface feature — a void system, an aquifer, a contamination plume — needs to be fully characterised in three dimensions.

Vertical Electrical Sounding (VES)

A single-point technique that measures resistivity variation with depth at a specific location — building a vertical profile of subsurface conditions from surface to investigation depth. Particularly effective for aquifer depth determination and soil-rock boundary identification.

Subsurface risks that we uncover

Groundwater & Aquifer Mapping

Unmanaged groundwater is one of the most common causes of cost overrun in mining and infrastructure projects. Resistivity surveys map aquifer extent, depth, and connectivity across your site — giving your team the spatial picture needed to design dewatering, plan excavation, and avoid unplanned water ingress.

Void & Cavity Detection

A void beneath a road, a dam foundation, or a building pad is a liability waiting to surface. Resistivity surveys identify cavities, old mine workings, and sinkholes before construction begins — when the cost of discovery is a survey, not a structural failure.

Fault & Fracture Zone Identification

Fault zones encountered mid-construction or mid-mining are programme disruptions with significant cost and safety consequences. Resistivity surveys map structural features across your site before they become surprises — giving your design and planning teams the intelligence to route around or design for them.

Soil & Rock Characterisation

Knowing where soil ends and rock begins — and what type of rock — determines your excavation method, equipment selection, foundation depth, and blast design. Resistivity defines these boundaries across your entire survey area without drilling every location.

Contamination Mapping

For brownfield development or industrial sites with uncertain history, the spatial extent of ground contamination directly determines your remediation cost and programme. Resistivity surveys define that extent before you commit — avoiding remediation scope creep and regulatory surprise.

Speak to Our Geophysics Team

Electrical resistivity studies are most valuable when integrated with your broader investigation programme. Uttam Blastech’s geophysicists will assess your site, define survey objectives, and design a resistivity programme that delivers the subsurface intelligence your project needs — at the lowest investigation cost.