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seanbrockest t1_j940qb8 wrote

Canadian Potash (potassium chloride instead of sodium chloride) mine here. Our mine is roughly 76% NaCl and 22% KCl. What we mine is then refined. Our mine is dry, so I've never experienced salt burns, but if you have other questions I'd be happy to answer them.


PyroDesu t1_j943lbx wrote

Most salt mines are dry, because salt is hygroscopic.

Apparently it makes ones which are no longer actively being mined very useful for preserving things like film, books, etc.


seanbrockest t1_j945b43 wrote

Mostly true, but there are wet mines. My company used to have one on the East Coast of Canada that literally went out underneath the Atlantic Ocean. They were under the ocean!

The rock was very cool, so all humidity coming in on the fresh air formed as condensation on the walls, creating a wet mine.