1. in Permian formations, carry out activities relating to the prospection and exploration of oil and natural gas deposits;

2. Entities active in the prospection and extraction of coal pursuant to the Zakon o rudarstvu (Uradni list RS

3. Artificial magnetotellurics allows a fast and countinuous electrical prospection of the field; the signal shape in terms of Fourier transform, in the refraction seismic method, gives some insight into such matters as soil moisture or degree of fissuration of rocks; countinous direct current profilling on the river or sea floor leads to the thickness of soft alluvium.