Sirius Minerals Plc is a United Kingdom-based fertilizer development company. The Company is primarily focused on the development of polyhalite deposit located in North Yorkshire, the United Kingdom. The Company operates through a segment, which includes the UK segment, which consists of its North Yorkshire polyhalite potash project related activities and the corporate operations. The North Yorkshire polyhalite potash project, located south of Whitby in North Yorkshire, focuses on having an initial production capacity of approximately 10 million tons per annum and full production of over 20 million tons per annum. The Company's polyhalite product, POLY4, is a fertilizer, which contains approximately four of the six component that plant needs.