there are, broadly speaking, three ways to make salt. You can evaporate it from the sea, a painstaking process the Neolithic people in Boulby were carrying out at scale thousands of years ago. You can dig rock salt out from the ground, as happens in perhaps the oldest operational mine in the world: the Khewra salt mine in Pakistan, which is said to date back to the era of Alexander the Great. You’ve probably encountered Khewra salt before; it is better known these days as pink Himalayan salt, though the mine is actually about 200 miles from the Himalayan foothills, making this a cheeky bit of
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