Adding to Krom's info....
I'd have to mention some info on the fairgrounds area we hunt....
The fairs on that land ended in the 1920s or so probably....
The land was abandoned and has been since then...
The property changed hands, never really had anything done to it except for the old railroad being torn up and turned into an ATV trail (the railroad ran along the edge of the fairgrounds, leaving space between dropoff/pickup points and actual pocket action).
Trees grew and filled the bustling area, and most recently, those trees were torn down.
The ground was then turned... that's when coins started popping... less digging, easier digging, etc...
And the ground was turned again... and a race car track was packed where the old horse track was.
The owner had some fun with his friends racing and crashing cars for a summer.
But tree removal and ground turning still continues in spurts at the old fairgrounds.
So, I think if you want the old silvers from the fairgrounds you currently hunt,
if it's still an active fairground, seek the deep signals. Put your detector on steroids and run it.
Good luck out there... hope you start pulling more of that old stuff!