Future project reporting

19 January 2017

Sirius Minerals Plc

Future project reporting

Sirius Minerals Plc ("Sirius" or the "Company") provides an update on the future reporting of updates for its North Yorkshire polyhalite project (the "Project") following the successful completion of its Stage 1 Financing in late 2016.

Going forward the Company will provide general development and construction updates to the market on a quarterly basis. For the coming twelve months these are expected to be released at the following times:

· Week commencing 27 March 2017;

· Week commencing 26 June 2017;

· Week commencing 25 September 2017, and;

· Week commencing 8 January 2018.

These will be in addition to updates on key Project milestones, as they occur. In addition, the Company will regularly update its investor presentation, other content on its website (www.siriusminerals.com) and social media channels, as the Project develops.

Current activities

A number of works required to deliver the Project have already begun and more are due to commence shortly. These are all in-line with the Project schedule, as detailed in the Company's investor presentation.

Highway works required as part of the development ramp-up are currently due to commence on 30 January 2017. This enabling work includes improvements to the junctions of site access roads and other minor local highways improvements. This work is expected to be complete by 7 April 2017.

Site investigation works including further geotechnical studies have been underway since the end of 2016. An additional drilling rig, similar to that used during the Company's exploration campaign, is expected on site at the end of February 2017 in order to gather more detailed information for the upcoming shaft sinking. The full site preparation phase is expected to commence on schedule in Q2 this year, as previously announced.

In addition to the above activities a significant amount of detailed engineering, design and commercial work is underway across all aspects of the Project.

Regulatory information

For the purposes of MAR and Article 2 of Commission Implementing Regulation (EU) 2016/1055, this announcement is being made on behalf of the Company by Gareth Edmunds, External Affairs Director.

For further information, please contact:

About Sirius Minerals Plc

Sirius Minerals Plc is the fertilizer development company focused on the construction and development of its North Yorkshire polyhalite project in the United Kingdom. It believes the Project represents the world's largest high-grade known 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 (AIM: SXX). 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.