CHMA Signed for Adavale Project

For immediate release: 0700hrs, 7 APRIL 2011

Sirius Minerals Plc

("Sirius" or the "Company")

Cultural Heritage Management Agreement Signed for Adavale Project

The Directors of Sirius Minerals Plc (AIM: SXX, OTCQX: SRUXY), the globally diversified potash development group, are pleased to announce the signing of a Cultural Heritage Management Agreement ("CHMA") with the Bidjara People, the Registered Native Title Claimants over the area in Queensland containing the Adavale Project.

The CHMA establishes a formal framework for the management and protection of Aboriginal Cultural Heritage sites and a basis for expediting exploration activities on the Adavale Project.

Chris Fraser, Managing Director and CEO of Sirius said: "We are very pleased to conclude this CHMA with the Bidjara People. It clears the way for Sirius to advance the Adavale Project while protecting areas and objects of significance to Aboriginal Cultural Heritage. The Bidjara People are important stakeholders for the Adavale Project and we look forward to a positive long-term working relationship."

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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 recognised potash deposits. Today it holds properties in the United Kingdom (North Yorkshire), the United States (North Dakota), and Australia (Queensland and Western Australia).

The Company is additionally progressing ongoing Research and Development initiatives into the secondary uses of salt and potash beds for energy storage and carbon dioxide sequestration.

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 the use of a sponsored ADR facility. Further information on the Company can be found at www.siriusminerals.com.