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Potash mines are a common sight in Saskatchewan, and most residents are well aware that the industry commands billions of dollars on the global market and is an important component of the province’s economy. Less obvious, however, are its origins and its uses, which range from the biological to the chemical.
The term “potash” refers to not one, but several potassium compounds and potassium-bearing materials that contain water-soluble potassium. It is so named for the pre-industrial practice of using large, iron pots to collect potassium evaporated from wood ash. Eventually, the term would be applied to both naturally-occurring potassium salts and the substances produced through the industrial extraction and refinement of those salts.
Potassium is a metal, and an extremely active one at that. When ignited, it burns with a purple hue and, when introduced in its pure form into the atmosphere, it reacts violently with any oxygen and water that it encounters. Its interaction with water is particularly dramatic, creating corrosive potassium hydroxide and leaving free hydrogen atoms to react with other molecules.
Stable potassium salts were infused into the soil of this province beginning roughly 544 million years ago, between the Cambrian and Mississippian periods.