DFS announcement date

15 March 2016

Sirius Minerals Plc

DFS announcement date

Sirius Minerals Plc (AIM: SXX, OTCQX: SRUXY) ("Sirius" or the "Company") announces that the Company expects to announce the material findings of the Definitive Feasibility Study ("DFS") for its polyhalite project in North Yorkshire, on Thursday 17 March 2016 at 7am.

The announcement will be accompanied by an updated investor presentation and webcast, available on the Company's website (www.siriusminerals.com).

Sirius will be hosting an analyst briefing at 15:00 GMT in London on the same day of the announcement. Any analysts wishing to attend should email [email protected] to register.

Chris Fraser, Managing Director and CEO of Sirius, comments:

"The DFS announcement will allow us to clearly outline the Company's strategy and value proposition throughout multiple scenarios and cycles. I look forward to detailing the world class and robust nature of our polyhalite project in North Yorkshire."

For further information, please contact:

About Sirius Minerals Plc

Sirius Minerals is the fertilizer development company focused on the development of its polyhalite project in North Yorkshire, the United Kingdom. It has the world's largest and highest grade deposit of polyhalite, a multi-nutrient form of potash containing potassium, sulphur, magnesium and calcium. Incorporated in 2003, Sirius Minerals' shares are traded on the London Stock Exchange's AIM market. Its shares are also traded in the United States on the OTCQX through a sponsored ADR facility. Further information on the Company can be found at: www.siriusminerals.com.