Boulby Mine, near the tourist village of Staithes, in North Yorkshire, is one of only two places in England where the salt used on the country's roads is mined. It produces hundreds of thousands of tonnes for Highways England to cover the main routes and for dozens of council contactors to spread across the rest.

Boulby Mine, near the tourist village of Staithes, in North Yorkshire, is one of only two places in England where the salt used on the country's roads is mined. It produces hundreds of thousands of tonnes for Highways England to cover the main routes and for dozens of council contactors to spread across the rest.