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Metal will hold great value in a collapse society. I think of things like coin money or shell casings. These could be incredibly valuable in a collapsed society. These are items that would be nearly impossible to find with any efficiency. If you fashioned your own metal detector you could have an easier go on your search. There are many other uses for a metal detector as well. This could be used to find survival caches as well depending on what you make them out of.
The process outlined requires some knowledge of electronics but if you have a survival metal detector it could add another level to your overall preparedness. In survival it will be the little advantages that make it work. This article is the first time I considered a metal detector for my survival arsenal. I like the idea!