Short answer - it is fairly easy to separate ferrous from non-ferrous, and that is what many prospecting machines attempt to do. There is no way to reliably tell one type of non-ferrous metal from another non-ferrous metal, so you have to dig all the lead bullets, aluminum, etc. to get the gold. Now some details. Metal detectors are electromagnetic devices. They therefore "see" items that can either conduct electricity (are conductive) or have magnetic properties, or both together. The
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