VLF metal detectors are very sensitive to Iron. Can Iron he rejected while gold nuggets are still found?
Iron can be rejected by a VLF discriminator, while still having the ability to detect gold, if the discriminate level is set very low. Doing this, however, means that the tiny pieces of gold may be lost due to the fact that the signals they cause are below the reference level of the electronic detection circuitry of the detector. The best way to hunt for gold is still in the All Metal mode, preferably with a detector designed with the extremely high gain necessary to detect the little bitty pieces.
