LRL Detection principle

[Jeg]

Hi people
I would like to ask the experienced members if someone knows on what principle all those LRL's are based on for finding gold. Especially Mineoro or other electrostatic like LRLs



I have worked a lot with GG AL718, and i know that it works with the help of telluric currents or by the use of a transmitter. I also know that its ferrite antenna creates beats when sudden EM changes happen and so someone can find a direction like Radio Direction Finding. The target's signal is sensed via the magnetic part of the field and that is what ferrites are doing there.



But what principal mineoro or other similar LRLs use? In addition can someone describe with few words how can i implement such an LRL technically?


ps. I have envisioned a system in which two capacitor plates are facing one an other. A negligible dc signal will charge those two surfaces. If a third plate (gold target) is in line with this antenna, the dc field in the antenna cap will be modulated as we know that target emmits. Does it sound valid?
One more thought is to feed the antenna-cap with a negligible AC signal of any frequency i like, and when a third signal from target is in line, due to the fact that they would be out of phase, the output will normally be decreased and so...detected.




Thanks