This is American Rock Salt's mine in Mt Morris, NY. This production shaft is
over 1400 feet deep. The mine produces over 3 million tons of de-icing salt.
If your area uses salt on the roads in Winter, there's a good chance it came from here.
For those of you who have Facebook, a local "newsman/photographer" took
a video over the mine and it can be found on his Sept 17 post.