​Geochemical surveying characterises the baseline chemistry of soil, stream water and stream sediment by taking samples of these materials by hand at a density of approximately one sample every 4 km².

Multi-element laboratory analyses of these samples to trace-level allows a suite of some 55 maps to be produced. These are useful for mineral exploration, agricultural productivity and environmental management.

​Tellus employs a low-flying aircraft to collect geophysical information on the properties of soils, rocks and waters below ground. Flying at 60 m, the aircraft is able to sense geological properties not apparent from conventional mapping techniques, effectively ‘seeing through’ Ireland’s often deep glacial deposits and extensive peat and soil cover.

This method of acquisition is the most rapid and cost-effective means of acquiring regional-scale geophysical data for supporting geological mapping, mineral exploration, radon risk mapping and geothermal energy exploration.