The high-frequency metal detectors out there will be good for finding low conductivity items, such as gold. These are great for more accurate finds, so ...
from Google Alert - metal detecting great finds https://www.google.com/url?rct=j&sa=t&url=http://edu.valricostate.com/metal-detector-frequency-for-gold/&ct=ga&cd=CAIyHGQxYTc0ZWJmMDQxMjk0NzA6Y29tOmVuOlVTOkw&usg=AFQjCNGIyxD-DEIow9Uo-EhiD4GPGogWAA
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