Warrant Expiry - Reminder

23 October 2015

Sirius Minerals Plc

Warrant Expiry - Reminder

The Directors of Sirius Minerals Plc (AIM: SXX, OTCQX: SRUXY) ("Sirius" or "the Company") hereby provide an update in respect of the warrants issued to investors on 14 March 2014 ("Warrants"), in connection with the placing by the Company announced on 6 March 2014.

The Warrants will lapse at 5.00 p.m. on 30 October 2015. If Warrant holders wish to exercise their Warrants over ordinary shares in the Company prior to the lapsing date, the Company's registrar, Capita Asset Services, will need to have received the necessary exercise notice and payment from the Warrant holder or the Warrant holder's nominee prior to 5.00 p.m. on Friday 30 October 2015.

Further information relating to the Warrants, including in relation to how to exercise the Warrants, can be found on the Company website: www.siriusminerals.com/investors/warrants.

For further information, please contact:

About Sirius Minerals Plc

Sirius Minerals is the fertilizer development company focused on the development of the York Potash Project in the United Kingdom, which 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.