These are great for more accurate finds, so long as it's close to the surface. Example: a 20 Khz metal detector will send and receive a signal 20, 000 ...
from Google Alert - metal detecting great finds https://www.google.com/url?rct=j&sa=t&url=http://dgj.delsero.it/metal-detector-frequency-for-gold.html&ct=ga&cd=CAIyHGQxYTc0ZWJmMDQxMjk0NzA6Y29tOmVuOlVTOkw&usg=AFQjCNFNiR7jAZAsOj4EApIPIZqu3riK6w
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