Preferential Flow Paths Identified using Non-Invasive Technology

Willowstick instrument (specially tuned magnetic receiver, simultaneously collects magnetic field and GPS data).

Contaminant seepage flow paths entering and/or exiting tailings impoundments are a major headache for mine owners and regulators. These preferential seepage flow paths are difficult and expensive to find.

Willowstick case study:

In this particular case, contaminated groundwater from the waste rock dump was bypassing a drainage collection trench into the tailings pond, and the client wanted to know where the water was bypassing the drainage collection trench.

Willowstick performed a groundwater investigation where they identified several preferential flow paths that bypassed the drainage collection trench. Willowstick’s identification of these flow paths allowed the client to begin targeted remediation.

They used the Magneto Metric Resistivity (MMR) method to identify the exact location of the groundwater flow paths. The method uses electrodes that are placed strategically upstream and downstream of the area of investigation, and the water between them is energized with a low voltage, low amperage, alternating electrical current with a 380Hz frequency. The current creates a distinctive magnetic field that represents the location and character of the groundwater flow occurring between the electrodes. This magnetic field can be measured from the surface using a Willowstick instrument – specially tuned magnetic receiver.

The collected magnetic field data is used to render two- and three-dimensional (2D and 3D) maps and Electric Current Distribution (ECD) models of seepage paths. Through this technique, investigative teams have accurately diagnosed seepage and groundwater problems for over 300 projects in location around the world.

This project saved the client a significant amount of time and money. Check out Willowstick on our website.