Just to correct michaelr's information: This salt was not made from underground (mineral) water, but from subterranean stone salt. But the process of mining uses a lot of water to transport the salt: the mine is flooded, the salt dissolves, and the salty water is pumped to the surface. Exposing the water to the wind reduces the water percentage. Finally the water is cooked away and a fine grained salt remains. So it is still done in Bad Reichenhall where I have visited the mines.

Wilfried