​​​Tellus involves two types of surveying – airborne geophysical surveying using a low-flying aircraft and ground-based geochemical surveying of soil, stream water and stream sediment.

Surveying activities for 2017 consist of airborne surveys in Co Mayo and Co Donegal, and a geochemical survey across  the midlands of Ireland.

Both surveys commenced in early spring, with the airborne survey completing its final flight on 4th October 2017. The ground survey will continue to operate through autumn 201.  See survey blocks outlined below.