Grey sludge that sticks to magnet from lakes?

ecmjamsit

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Dec 2, 2007
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Colorado
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Whites Goldmaster GMT, GMII,Whites Sierra Super Trac, Ace250, Teknetics Gamma 6000, Whites Pinpointer,Garrett Pro Pointer II
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Magnetite. In Colorado dredgers call it black sand. It is an iron compound.
 

bowwinkles

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Nov 3, 2012
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All Treasure Hunting
I use liquid car wax on my magnet and this helps to prevent rust plus makes it much easier to clean that type of contaminate.
 

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