The best device to detect rough gold works using electromagnetic technologies and often VLF or very low frequency technology.
In this case the device use a dish shaped search coil with included two built-in coils usually made of copper , first one for transmitting electromagnetic signal generated by flow of electric current inside the coil and other coil used for receiving incoming signals that result from hitting the sent signal with metal object underground and convert them into an audio tone or digital number called Target ID which display on screen of the device.
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