Boulby’s two shafts are 1,100m deep and lead to hundreds of miles of roadways which descend even further down into the earth. The mine was opened as a potash mine and the rock salt was produced ...

As temperatures have dropped and icy weather has hit the UK, you've probably run in to some gritter salt on our roads. If you've ever stopped to take a look at a gritter, you may find yourself ...

producing the majority of the world's pink salt. All the mining starts here, at the train station. This train takes miners deep into the mountain. Here, tunnels stretch for 25 miles, and it's ...