Goderich, ON: Sifto is World's Largest Underground Salt Mine

(Satellite)

SiftoCanada, cropped
It shares the harbor with the P&H grain elevator.

6:38 video

They narrator points out that the mine is now larger than the town.

6:38 video

It looks like they have a lot of dolomite as well. It is 1800' (550m) undergound.

6:38 video

Dave Hooton posted
Mid 1970’s postcard view of the salt mine at Goderich Ont. The  boats tied up in the background are out of service grain storage boats for the grain elevator. Posted July 7, 24.

Walter E Pfefferle: I see the CP bridge in the top of the picture I guess it was still being used in the '70s.

Dave Hooton: Walter E Pfefferle Used until Dec.1988.

John Vincent commented on Walter's comment
Not a great picture, but a close up of the bridge mentioned in the mid 1970's.