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Salt has been one of the most essential resources in human history, once considered more valuable than gold as a strategic material. While the table salt we commonly use often comes from evaporated sea salt, another major source is deep underground salt mines. In this post, we’ll explore the formation of salt mines, famous salt mines around the world, the characteristics of mined salt, and their tourism and economic value.     How Are Salt Mines Formed? Salt mines were formed hundreds of millions of years ago when ancient seas evaporated, leaving behind concentrated layers of salt. Today, the salt mined from these areas is known as rock salt, a type of sedimentary rock. These salt layers usually lie tens to hundreds of meters underground and have accumulated under specific geological conditions. Famous Salt Mines Around the World Wieliczka Salt Mine, Poland: A UNESCO World Heritage Site, famous for its underground chapels, salt sculptures, an...