The salt deposit was formed approximately 40 million years ago when an ancient sea evaporated.
Salt extraction in Cardona dates back to Neolithic times, making it one of the oldest industrial sites in Europe.
The mountain is considered a world-class geological site due to its rare diapiric structure that breaches the surface.
The interior of the mine is naturally resistant to erosion because of the specific mineral density of the salt.
The salt variety found here, sylvinite, is a rare type of potash-bearing mineral used primarily for fertilizers.
The Cardona Salt Mountain is a diapiric geological formation consisting of a potassium and rock salt deposit that reaches depths of two kilometers. The site served as an active mining operation from the early 20th century until 1990. Visitors can explore the interior galleries through guided subterranean tours that reach depths of 86 meters. The landscape features colorful folds and veins of white, orange, and reddish salt minerals. Scientific research confirms the deposit is still growing due to tectonic pressure. The temperature inside the galleries remains constant throughout the year regardless of external weather conditions.
The main gallery chamber where the light reflects off the intricate mineral veins in the walls.
Wear comfortable, sturdy walking shoes with good grip as the salt floor can be uneven or slightly slick.
Bring a light sweater or jacket because the mine maintains a consistent cool temperature regardless of the outside heat.
Book your guided tour online in advance to ensure availability, as entry is strictly controlled by group size.
Do not attempt to collect loose salt samples from the walls or floor as souvenirs; this is strictly forbidden for conservation purposes.
Closed on certain Mondays during the low season; check the official calendar for potential holiday closures.
Hard hats provided by the staff must be worn at all times inside the mine galleries; touching the salt walls is prohibited to prevent degradation.
