The history of salt could fill an entire book as it was a long time ago when we realized its great value on the human body. Apart from a material used to enhance the flavor of food for thousands of years, it was also known as a preservative of food which has been extremely useful during major population movements.
Great wars in history have been caused due to the exploitation of salt while many cities were built around the collection areas, the salt works. Salt has been used in the past as a currency with the higher example of Ancient Rome. The value of salt was great , so great that its sufficient to consider that the English word salary "salary", comes from the Latin "salarium" which means payment with salt.
The replacement value in Asian countries was equal to gold.
In Ancient Greece the salt needs were met with absolute adequacy of the crystallization of seawater and found traces of salt marshes from the Mycenaean era in 1100BC.