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 ...

About 230 jobs could be lost when a mine stops producing potash, a company has warned. Cleveland Potash Limited said it would instead be producing polyhalite at its Boulby mine in about six months.

As gritting trucks work around the clock during the first cold snap of the year, spare a thought for the miners who dig the salt out of the ground almost a mile down under the North Sea in ...