History The World''s Only Polyhalite Mine | ICL Boulby
Creating Boulby Mine as we know it today began in 1969 when the two mine shafts were erected at the site. A part of the community for over 40 years. Planning permission for the mine was obtained by Imperial Chemical Industries (ICI) in 1968 and they began work the following year. Under ICI, Cleveland Potash Ltd was a wholly owned subsidiary.