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Last Updated: 7 Feb 2018

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If you live in northern climates you know all about rock salt. It works well for managing ice on roads, driveways and sidewalks by lowering the freezing point of water but it also leaves an ugly white residue that gets on shoes and boots and always seems to work it's way into your home. Halite (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 hundreds of meters 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 Ohio, Kansas, New Mexico, Nova Scotia and Saskatchewan. The Khewra salt mine is a massive deposit of halite near Islamabad, Pakistan. In the United Kingdom there are three mines; the largest of these is at Winsford in Cheshire producing on average a million tonnes per year. (from Wikipedia)