I hunted a park that I've hammered and it's not that big. Believe it or not that dime was only about 1/2" deep. I heard it and said to myself "I'll get this clad coin out of the way, maybe something is under it". Heck, I've probably passed over it several times and just didn't dig it because it was so shallow. Just goes to show you that they're not all 7 or 8 inches in the ground!!!