Once he finds the sites he has to know at what frequency to set his metal detector to find the relics. Different types of metal require different settings ...
from Google Alert - metal detecting great finds https://www.google.com/url?rct=j&sa=t&url=https://www.robesonian.com/features/125721/lumberton-police-officer-uses-metal-detector-to-search-for-bits-of-history&ct=ga&cd=CAIyHGQxYTc0ZWJmMDQxMjk0NzA6Y29tOmVuOlVTOkw&usg=AFQjCNHKLF-dF3N8ISUEwxagr23kPwlFwQ
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