Maybe it is not the acid rain that is ruining the coins. I think the high alcohol content of the spit might be the problem. Just kidding keep hunting and they will come.
Great job finding all those wheaties. Don't feel bad about not finding silver, It'll turn up. It could be worse you could be digging up all the beer tabs. (LOL)
I know what you mean about the soil and acid content. I find 1990's pennies that look like mortal hell. Then I find a 1902 Indian 3" deep and it's in good shape. We got to start find'n the silver (it maintains much better). Detect Drunk?? or while drinking umm?? -course you didn't say that; just when posting.
jim, thats why i wear liberty bibs when I am hunting, the pockets are big and there are 2 in the front on your chest, i can carry ATLEAST 5 beers and digger!!....of course it is kind of heavy and bulky so once you get started you really have to slam a few quick to get rid of the access luggage