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Monte Kali is an unusual landmark in the small town of Heringer in eastern Hesse, Germany. It’s a spoil heap containing nothing but sodium chloride or common table salt, which is a byproduct of potash mining. For over a hundred years, potash mining has been a major industry in the region. It started with the opening of Wintershall potash works, which began mining in 1903, and today is the world’s biggest potash mine with an operational area about the size of Greater Munich’s.

Potash mining produces a mixture of potash and sodium chloride, with potassium content between 20% and 35%. Thus, for every ton of potash recovered, several tons of sodium chloride is produced. This is dumped at several sites around the region. The dumps contain up to 96% sodium chloride.

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