SIRIUS MINERALS PLC - ADRs (bundles of 500 shares) (SRUXY)

[Thunderbolt]

Sirius Exploration: Queensland update

http://www.marketwire.com/press-release/Queensland-update-LSE-SXX-1307568.htm

Aug 20, 2010 08:00 ET
Queensland update

For immediate release:

Sirius Exploration Plc
("Sirius" or the "Company")

Queensland update

The Directors of Sirius Exploration Plc, (AIM: SXX, OTC: SRUXY), the mining and exploration holding company
focused on potash and salt deposits in North America and Australia, are pleased to provide an update in
relation to its properties in Queensland, Australia. The Company currently holds exploration permits
covering approximately 600 square kilometres of land overlying the prospective Boree Salt Member, a
formation recognised for its significant salt and potash potential. These properties lie some 50 kilometres
south of the town Blackall which has an established road, rail and airplane infrastructure.

During the last quarter Boyd PetroSearch ("Boyd") has been conducting a full interpretation of existing
seismic and petroleum drilling data for the permit land on behalf of the Company. This work was conducted
in two phases and has now been completed. Phase 1 involved the interpretation of publicly available 2D
seismic data; phase II involved digitising the available raster data of seismic lines within the project
area and integrating these with the initial interpretation to produce a new robust interpretation of the
Boree Salt Member.

The initial findings of this work suggest that significantly more salt is present within the exploration
permits than originally believed - Boyd calculating that approximately 100 billion tonnes exist within the
northern exploration permits. This is approximately a 100% increase when compared with the previous
estimations by Sirius using the historic Poseidon seismic interpretation (2008 Terra Search report).

Furthermore, no fatal flaws in the current programme to explore for potash were identified through Boyd's
2D seismic interpretation. Indeed, subsequent work by Sirius which has involved the integration of the Boyd
interpretation with additional data has enabled the Company to interpret a site considered very prospective
for potash formation.

Chris Catlow, Chairman of Sirius Exploration, commented:
"Thanks to Boyd's work, we now hold the most comprehensive analysis of the Boree Salt Member that
exists for our Adavale Project. We are now working with our exploration partners to develop the
initial test drill programme and look forward to updating shareholders on this activity as it
progresses. Adavale is located close to an area where good infrastructure is already in place.
It is also encouraging to see the progress being made by East Energy Resources with its nearby
Blackall Coal project."

Competent Person's Statement

The technical information contained in this announcement has been reviewed and approved by Derek Stonley, a
director of the Company. Mr Stonley graduated from Cambridge with a BA in Natural Sciences and has over
forty years experience in the mining sector. From 1980-1987, Mr Stonley held senior positions at BP
Minerals International Limited. As Consulting Geologist at BP Minerals, he was responsible for the
development of methodologies for valuing exploration properties worldwide. Following the sale of BP
Minerals to RTZ, Mr Stonley was Senior Geologist and ultimately a Consulting Geologist at Rio Tinto Mining
and Exploration Limited.

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