BLACK ROCK MINING LIMITED — Capital/Financing Update 2012

Apr 15, 2012

ASX Announcement

Company Announcements Office Australian Securities Exchange

By e-lodgement

16 April 2012

(ASX Code GRK)

OBL commences site preparation for Backreef-1 Production Test

Following Green Rock’s recent Announcements regarding:

• the execution of a binding Heads of Agreement with Oil Basins Limited (ASX:OBL) (“Oil Basins”) in relation to an option to acquire up to 20% of the highly prospective Backreef Area in the Canning Basin (Announcement on 2 April 2012), and

• the receipt of firm commitments by Cygnet Capital for a minimum of $3.22 million so that Green Rock is fully funded to exercise its option to acquire up to 20% of the Backreef Area for up to $2.5 million (Announcement on 12 April 2012),

the Company is pleased to note that Oil Basins, as operator of the Backreef Area, is progressing with preparations for the Backreef-1 Production Test. Oil Basins’ Announcement dated 13 April 2012 is attached.

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Nigel Hodder Company Secretary

Investors and Media T: +61 (0) 9482 0482 E: info@greenrock.com.au

About Green Rock Energy Limited

Listed on the ASX in 2005, Green Rock (GRK) is a geothermal and hydrocarbons explorer and developer with geothermal interests in Western Australia, South Australia and Hungary and hydrocarbons interests in Western Australia. Its key projects are:

• Attachments • A 15% interest in EP417 in the Canning Basin with a right to earn up to 20% through a farm-in agreement with New Standard Energy (NSE) together with an Area of Mutual Interest Agreement for other potential opportunities including the Seven Lakes Special Prospecting Area awarded to NSE

• • 1.An option to acquire from Oil Basins Limited (OBL) up to 20% of the Backreef Area in the Canning Basin Summary of the Terms of the Heads of Agreement

• An alliance with leading Australian renewable power developer Pacific Hydro for conventional geothermal power generation in GRK’s permits in the Mid West of WA and GRK’s and Pacific Hydro’s licences in the Great Artesian Basin in SA

• • A joint venture with MOL in Hungary for geothermal power generation (GRK 50%)

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13 April 2012

Company Announcements Office Australian Stock Exchange Limited 10[th] Floor, 20 Bond Street Sydney NSW 2000

Dear Sirs

COMMENCEMENT OF ONSITE PREPARATIONS FOR BACKREEF-1 PRODUCTION TEST

Oil Basins Limited (ASX codes OBL , OBLOA and OBLOB or the Company) wishes to make the following announcement as a matter of record.

The Company, as operator Backreef Area formally advises that the necessary Backreef Production Test documentation were formally lodged on 12 April 2012 with all stakeholders.

With appropriate authorities and stakeholder approvals already in-place, the Company now plans to commence the re-clearing the road and well/camp sites areas early next week in readiness for the arrival of ADS Rig#2 (planned for circa 1 May 2012) and subject to formal stakeholder approval to conduct the test.

As appropriate, the Company will make further updates on the Backreef-1 Production Test, including test objectives, in due course.

Yours faithfully

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Neil Doyle SPE Director & CEO