The Wilekzka salt mine, a ground network of artificial tunnels up to 327 meters deep to extract salt, is located below the town of Wilikzka in southern Poland. The date of the salt work in Welikzka, dates back to the Neolithic era, the salt solution was collected from neighboring springs and boiled in clay bowlsBy the 11th and 13th centuries, it was used as a preservative for various types of meat and fish, the decline of salt in spring water led to a series of fossils and deep wells to extract water with higher salt amounts. This led to the discovery of refined rock salt, a mineralA precious consisting mainly of sodium chloride. Seasonal mining operations flooded columns to extract valuable shalk salt deposits, and by the 14th and 15th centuries established the Wilixka salt, a profitable source of revenue for the great Casimir III who used the money generated from the mine to build the Krakow Academy.