Anhydrite grinding plant at ICI in Billingham. Anhydrite rock from the mine is ground to powder fine enough for the manufacture of ammonia of sulphate. 
Picture Stockton Archive
A Pictorial History of Stockton-on-Tees
Anhydrite grinding plant at ICI in Billingham. Anhydrite rock from the mine is ground to powder fine enough for the manufacture of ammonia of sulphate.