Matt 5v13 has Jesus say,"You are the salt of the earth. But if the salt loses its saltiness, how can it be made salty again?"
And Judas replied,"Who cares, just mine some more from under Lake Huron and Lake Michigan. There is enough there to supply 9 million tonnes a year for centuries. Throw it out on the roads of North America to be trampled under by cars, saving them from having an accident on ice. I'm going to stake ma claim right now, then I'll be God e rich.
The salt is thought to have been laid down during the silurian age, 430 million years ago, when a salty sea repeatedly dried out.
It is capped by dolostone which was formed 380 million years ago and contains fossilized coral. Yet more evidence to show the Babble is wildly mistaken about the idea that the Earth started 6000 years ago. So you've had your chips Jesus, liberally sprinkled with sea salt"
I read about it on "How the earth was made" by History channel, episode,"The great lakes"
35% of North Americas salt comes from these mines. Thin black lines in the walls of the salt mine show separate layers.
The Goderich mine can also be seen on Youtube
"The world's largest salt mine", Toronto Star channel