I can't remember if this mine is the same, or if not there is another if it hasn't been flooded that's under Erie that was owned by Morton. They were having a lot of water problems. Many, many pumps totaling thousands of horsepower running daily to keep the water out. I used to work for the company that made the "crusher feeder breaker" that the narrator in the above link speaks of.
There also one or more mines of this type in the New Iberia, Avery Island area of La. One is gone though.. Remember when an oil exploration Co. was drilling in the bottom of a lake in La. & drilled into a mine? What a mess.
