What is "boulby"

Boulby is a village in the borough of Redcar and Cleveland and the ceremonial county of North Yorkshire, England, located within the North York Moors National Park. Boulby was in the North Riding of Yorkshire until 1964, followed by the county of Cleveland until 1996. It is located just off the A174 near Easington, and 1 mile west of Staithes. The village was the site of alum mining activity in years past, and is currently the site of Boulby mine, a site run by Cleveland Potash Limited which produces half of the UK's output of potash.