What is so special about the Preesall salt?
The Preesall halite salt, alternatively known as rock salt, was laid down some 200 million years ago. The depth of the salt bed deepens from the east, the high ground, to the west, under the river. The shallowest area was worked by the Romans and subsequently by salt activities over the last century. The deepest salt has not been mined and is ideal for the creation of new gas storage caverns.
