The mine was established between the 12th and 13th centuries after salt was discovered in Bochnia.

A rich reef was found at the hill crest in 1856 and an underground mine was established.

The mine was established around 1330's and remained operational until the end of 15th or beginning of 16th century.

The mine was established by a man named James in the early 1890s.

The first mine was established in 1702, and the commercial development started in 1718.

The first mine was established in 1747.

United States officials fear the same thing could happen if a mine is established here.

More than 25 mines and a number of foundries had been established by 1785.

Three mines were established to help provide the raw materials for, among other things, cannons used during the Civil War.

A captive mine at Ambadungar was established also to feed the plant.