Any veteran detectorist will tell you to do some research before buying the detector that is right for you. For instance, all metal detectors will find gold but there are different types made that are more sensitive to and specifically for gold. read more
When the detector is near metal, these currents flow into the metal and another magnetic field is created. The coil on the metal detector can sense this other field and will indicate that metal is near. With the invention of the pulse induction metal detector, it became easier to find gold among other junk metals. read more