The Sulphur Mines dome was where the Frasch process of sulphur extraction was first put into practice, leading to the boom in sulphur production from salt dome caprock all over the Gulf. The last of the mines in the region closed in 2000. The Brimstone Museum is located nearby, in downtown Sulphur. The salt dome here has two storage cavities for gas, with around a million barrels of capacity each, and a solution salt mining operation.
