Grab from PA video of workers in Boulby Mine, in North Yorkshire, one of only two places in England where the salt used on the country’s ... is home to one of the world’s leading projects ...

KHEWRA, Pakistan, (AFP) - A centuries-old salt mine in Pakistan is offering experimental asthma therapy, attracting patients from all over the world. Khewra, billed as the world's second largest salt ...

Every year over 200 000 tonnes of salt is harvested from the surface of ... the whole project was shot in about an hour.' ‘The mine itself is actually quite small,’ she said.