During the flights, the probe mounted on the helicopter – equipped with highly sensitive magnetic field sensors – receives electrical signals from conductive ore bodies, which are induced by power cables laid on the ground. This environmentally friendly exploration method is known as semi-airborne electromagnetics. It was developed by the partners in previous projects and has already been tested in various international exploration areas in the Harz Mountains, Sweden, Spain and Namibia. The team is now applying this further development in the Ore Mountains for the first time. 

“The Ore Mountains have already been well explored in places through drilling and geochemical data, but there is a lack of three-dimensional models, particularly for great depths. These can be derived indirectly from the distribution of electrical conductivity, thereby providing mining companies with a better basis for calculations and drilling locations,” explains Thomas Günther, Professor of Applied Geophysics at the TU Bergakademie Freiberg. The team expects the first results from the measurements in the western Ore Mountains in autumn 2026.

New methods for environmentally friendly mineral exploration

Semi-airborne electromagnetics can be used to efficiently and with high resolution map the electrical properties of sediments and rocks underground across large areas and to a depth of 1,000 metres – without a single deep borehole. Analysis software developed by the team uses the measured data to create three-dimensional models of electrical conductivity, which provide indications of mineralisation from underground veins.

The analyses are supplemented by AI-supported predictions and integrated interpretative approaches to geophysical, geological and geochemical measurement results. “Together with data from existing boreholes, we will produce reliable 3D models by spring 2027. These can be used to generate more accurate deposit predictions, which can then be verified through drilling,” said Günther. In August 2027, there will be a further aerial survey focusing on the Hämmerlein-Tellerhäuser project area.

The aim is to translate this complex exploration method from research into industrial practice, which is why industrial partners from the region, such as the geosciences service provider Beak Consultants and the mining company Saxore Bergbau, are also involved. DESMEX-MinD is thus making an important contribution to securing the supply of raw materials in Germany and Europe.