Never forgetting that:6 Aug 2019 18:47
Sirius Minerals through the development of its North Yorkshire polyhalite project, Sirius Minerals will become a world leading producer of polyhalite, a unique multi-nutrient fertilizer containing potassium, sulphur, magnesium and calcium....
The polyhalite deposit is the world's largest and highest grade !!
K2Ca2Mg(SO4)4·2H2O. Pdyor ...