4 September 2014

Sirius Minerals Plc

Issue and Allotment of Ordinary Shares following Exercise of Conversion rights

The Directors of Sirius Minerals Plc (AIM: SXX, OTCQX: SRUXY) ("Sirius" or the "Company" ) hereby announce that the Company has received notices of exercise in respect of convertible securities previously issued on 23 January 2014 at a conversion price of 9.7p per share, the details of which were announced to the market on 12 August 2013 pursuant to which 2,577,320 ordinary shares (the "Relevant Shares") fall to be issued. Application has therefore been made for the Relevant Shares to be admitted to trading on AIM with admission expected to take place on 5 September 2014. The Relevant Shares will rank pari passu in all respects with all existing ordinary shares in the Company.  

Following admission of the Relevant Shares, the Company's enlarged issued share capital will comprise 1,895,310,461 ordinary shares with voting rights. This figure of 1,895,310,461ordinary shares may be used by shareholders in the Company as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change in their interest in, the share capital of the Company under the FCA's Disclosure and Transparency Rules. 

For further information, please contact:

Sirius Minerals Plc

Investor Relations

Email: ir@siriusminerals.com

Tel: +44 8455 240 247

Joint Brokers

Liberum Capital Limited

Clayton Bush, Tim Graham

Tel: +44 20 3100 2222

Macquarie Capital (Europe) Limited (NOMAD)

Steve Baldwin, Raj Khatri

Tel: +44 20 3037 2000

WH Ireland

Adrian Hadden

Tel: +44 20 7220 1666

Media Enquiries

Bell Pottinger

Mark Antelme, Lorna Cobbett

Tel: +44 20 3772 2500

Warrant Trading Enquiries

Liberum Capital Limited

Simon Smith

Tel: +44 20 3100 2171

About Sirius Minerals Plc

Sirius Minerals is a globally diversified potash development company. Its primary focus is to bring on stream major potash mining facilities through the acquisition and development of projects overlying recognized potash deposits.  Today it holds properties in the United Kingdom (North Yorkshire) and the United States (North Dakota).  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 atwww.siriusminerals.com.


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