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Following completion of concept studies, Sirius Minerals (SXX) has been able to slash an estimated $1bn (£633m) from the cost of bringing its wholly-owned York Potash project into production. Sirius has been able to reduce its upfront costs to $1.7bn after taking the decision to sell its ore as unrefined, granulated polyhalite, as opposed to the sulphate of potash (SOP) it had initially intended to produce on Teesside.