great copper penny mystery needs solving

[ghost of scrounger]

Said park usually provide mix targets.
Today 35 copper pennies vs 2 quarters 15 dimes.
I have hit this place a lot.with etrac.ignoring zinc.
Usually would find 5 to maybe 11 of the real
Copper. All today they were everywhere!

 

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[GA_Boy]

Was the ground wet today and dry the other times? You don't show where you are so I can't check your weather.