I know the deeper the target the older the coin or artifact usually is. Up here in Minnesota with the winters and the ground freezing and thawing every year I am starting to wonder how deep the old stuff is. My two oldest finds have been a 1939 Mercury dime and a 1934 wheat penny. Both were found right next to the sidewalk which I think prevented them from sinking deeper and only a couple inches down, but I have been finding much newer coins up to 5 or 6 inches down digging with a screw driver. What have you guys been finding and how far down. I am getting pretty good with the 705 (3 week newbie with over 500 newer coins...mostly pennies) but am still a little nervous about bringing a shovel to dig the deeper targets. What has been your experience with coin depths vs age. Thanks