New to this. Just got an ACE 250 for fathers day. I've got many hours on it. Found allot of clad, a few rings, a 1907 dime. I was wondering, do the coins and jewelry sink deeper with time? I have found 2004 quarters 4" deep. From wi. there's allot of clay and black dirt here. I have been to many old parks and beaches and I can't seem to find many old coins. Would appreciate any help.