12 May 2016

Sirius Minerals Plc

Non-executive director change

§ Louise Hardy appointed to the board as an independent non-executive director

§ Stephen Pycroft steps down as a non-executive director

Sirius Minerals Plc (AIM: SXX, OTCQX: SRUXY) ('Sirius' or the 'Company')announces a non-executive director change.

Louise Jane Hardy, 49, has joined the board. She has over 25 years' experience in the engineering sector. Louise currently has a part time executive role at Skanska, Civil Engineering UK and holds non-executive director roles at Ebbsfleet Development Corporation and Defence Infrastructure Organisation, both executive non-departmental public bodies sponsored by the Department for Communities and Local Government and the Ministry of Defence respectively. Prior to this she was European Project Excellence Director at Aecom.

Previously she worked for Laing O'Rourke, working as Infrastructure Director within CLM, which was the consortium delivery partner for the Olympic Delivery Authority for the London 2012 Olympics. Louise is a Fellow of the Institution of Civil Engineers and a Fellow of the Chartered Management Institute.

Mr Stephen Gerard Pycroft has stepped down from the board after over two years of service to the Company due to increasing work commitments in his role as executive chairman of Mace.

Russell Scrimshaw, Chairman of Sirius said:

'On behalf of the board I would like to thank Stephen for his valuable involvement and support over the last few years especially in the development of our DFS and Project planning.'

'Louise Hardy brings a wealth of experience in delivering large-scale construction projects and we are delighted to add her to our board.'

Stephen Pycroft said:

'I'm proud to have been part of an exciting period at Sirius, during which time major steps forward have been achieved in the development of its North Yorkshire polyhalite project.

'Whilst I am disappointed to be leaving the Board at this exciting time, I have known Louise Hardy well since Mace's involvement in the delivery of the London Olympics and I am delighted to support her appointment to the Sirius Board.

'I intend to remain a shareholder in the company and look forward to acting in an advisory role where I can continue to work with the Board and management to help Sirius deliver this important project.'

Directorships currently held by Louise Hardy are as follows:

• Ebbsfleet Development Corporation

• Defence Infrastructure Organisation

There is no further information regarding Louise Hardy that is required to be disclosed under Schedule Two, paragraph (g) (i)-(viii) of the AIM Rules for Companies.

The share options previously granted to Stephen Pycroft will lapse in accordance with the terms of the Company's Share Option Plan.

For further information, please contact:

About Sirius Minerals Plc

Sirius Minerals is the fertilizer development company focused on the development of its North Yorkshire polyhalite project, 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.