​Electromagnetic Method

https://5g.security/wp-content/uploads/2019/03/Electromagnetic-wave.jpg

The most common electromagnetic method of exploration is the induced polarization of massive sulfide deposits (MSD). By sticking a couple of electrodes into the earth and running a current through them,  IP and resistivity can be measured. IP is basically a measure of a circuit's storage capacity for electrical energy. When a circuit is run through some section of the earth and the IP reading drops dramatically, there is a high probability that an MSD is lurking below the surface. This is great because massive sulfide deposits are very valuable and usually contain a conglomeration of Zn, Pb, Au, Ag, and Cu.