Sources
There have been two main sources for salt: sea water and rock salt. Rock salt occurs in vast beds of sedimentary evaporite minerals that result from the drying up of enclosed lakes, playas, and seas. Salt beds may be up to 350 m thick and underlie broad areas. In the United States and Canada extensive underground beds extend from the Appalachian basin of western New York through parts of Ontario and under much of the Michigan basin. Other deposits are in Texas, Ohio, Kansas, New Mexico, Nova Scotia, and Saskatchewan. In the United Kingdom underground beds are found in Cheshire and around Droitwich. Salzburg, Austria, was named "the city of salt" for its mines. Tuzla in Bosnia and Herzegovina was named "place of salt" by Turks.
Salt is extracted from underground beds either by mining or by solution mining using water. In solution mining the salt reaches the surface as brine, which is then turned into salt crystals by evaporation.
Read more about this topic: History Of Salt
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