While navigators have used lodestones for hundreds of years to help find their way, it has been little over a century since the first use of magnetic methods to locate iron ore deposits. In the last few decades, metal detectors, while popularized in searching for buried treasure or valuables, are also routinely used to locate other buried metals such as pipes and cables. Though magnetic methods are responsive only to ferrous metals, the metal detector sees all conductive metals. "Mag" and metal detector instruments can assist the investigator of waste sites and underground tank sites to quickly produce accurate maps of such features.
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