AIM-listed diversified potash development company Sirius Minerals has increased and upgraded its York Potash Mineral Resource.
In an operational update issued on Tuesday, the company reported an increase of total mineral resource to 2.66bn tonnes at an average grade of 85.7% of polyhalite within an area representing 7.0% of the York Potash area of interest.
It additionally reported an upgrade of 820m tonnes of polyhalite at an average grade of 87.3% to indicated category.
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Chris Fraser, Managing Director and Chief Executive Officer of Sirius, said: "The scale and quality of the York Potash deposit has been known about for some time, but the upgrade to an indicated status is another key milestone for the project and one that will give further comfort in the strength of the project and this globally significant deposit."
Polyhalite is a multi-nutrient mineral containing four of the six macro-nutrients required for plant growth.
Sirius Minerals' share price was unchanged at 27p at 09:34 on Tuesday.
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