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<p>[QUOTE=&quot;swamp yankee, post: 2254429, member: 47868&quot;]I do a little &quot;dirt fishing&quot; once in a while and have had it happen to me more than once. It&#039;s called the &quot;halo effect&quot;= atomic sized particles are shed as metal corrodes creating a donut shaped ring around a buried coin which remains if the coin&#039;s retrieved using a screwdriver method. I come along now and get a signal and dig it with a shovel which breaks the &quot;ring &quot;up and POOF it&#039;s gone![/QUOTE]</p><p><br /></p>

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