Nothing that dramatic however the southwest corner of the county I live in is know for "wildcat" coal mines dug around the turn of the 20th century. Independent miners dug many small shafts mining coal to sell to the local broker who would put it on a trail bound for the steel mills. There are little to no records when they were sunk just what's been found over the years. I have ran across a few over the years. County built a new high school and spent a fortune filling an old shaft in. US Steel gave them the property but I'm not so sure how good of a deal it was in the end.