,,American West announces it will soon conduct a mobile...

,,American West announces it will soon conduct a mobile magnetotelluric (MMT) survey to improve target identification ahead of a drill programme later this year. The helicopter-borne survey of the Midway-Storm-Tornado corridor is designed to detect copper sulphides at depths greater than 200 metres with improved resolution, overcoming the limitations of previous geophysical methods in resistive host rocks.,, --------------------------------------------------------------------------------------------------------------------------------------
https://ivanhoeelectric.com/technologies/typhoon/

comes to mind..... is this comparable ?