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There is a sizeable community doing so called "magnet fishing". Check out r/magnetfishing

• boomboomsubban 3y ago
  Coins don't seem to be their target, as very few seem to be magnetic.
  • toogan 3y ago
    Hm, true. But I sometimes see people walking along beaches doing this kind of thing. Though they're probably hoping for rings (gold, silver, diamond, ...) rather than coins, which would make it much more lucrative as well.
    • klyrs 3y ago
      Gold, silver, and diamond are also non-magnetic.
      • boomboomsubban 3y ago
        Metal detectors, which is what they were describing, find metal that isn't magnetic.