The Woodsmith mine near Sneatonthorpe in North Yorkshire is expected to include the longest tunnel that is solely in the UK at about 23 miles, and the deepest mine in Europe. Polyhalite is a rarely used fertiliser with an unproven market. "China is a key customer for us in our ambition to be a leader in sustainable crop nutrition. Given our Crop Nutrients business forms part of Anglo American's exceptional growth trajectory over the next decade, we are continuing to foster strategic partnerships across the agricultural industry to prepare the market for the full range of commercial and environmental benefits that polyhalite can offer farmers and the entire food value chain," said Tom McCulley, chief executive officer of Anglo American's Crop Nutrients business. Work on the mine had been scaled back sharply under a restructuring plan set out in May.