Best Metal Detector for Gold Nugget Prospecting
06/07/2021 · * The GPZ 7000 uses Zero Voltage Transmission (ZVT) which effectively gives you two machines in one – a deep PI machine, and a high frequency VLF machine. Our Buying Guide E ver since James Marshall's 1848 discovery of gold at Sutter's Mill, gold prospecting in the United States has been the ultimate treasure hunt.