BLACK ROCK MINING LIMITED — Capital/Financing Update 2013

May 14, 2013

ASX Announcement

Company Announcements Office Australian Securities Exchange By e-lodgement

15 May 2013

(ASX Code GRK)

Clarifying Announcement

On 23 April 2013 Green Rock Energy Ltd (ASX:GRK and GRKOB) announced that the Company would make an offer to those GRKO option holders whose GRKO options (exercisable at $0.036) expired on the 31 March 2013, to subscribe for new options (GRKOB). This announcement serves as clarification.

Subsequent to the above announcement Green Rock Energy is now agreed that a placement to a select group of sophisticated and institutional investors of 243,942,167 GRKOB options would be more appropriate and will be made.

The subscription price for each new GRKOB option will be $0.0001, and these options will have matching terms to the existing GRKOB series (exercisable at $0.012 before 31 January 2015). The Company will apply for quotation of the new GRKOB options upon the completion of the placement.

The placement will be made within the Company’s capacity under ASX Rules 7.1 and 7.1A

The Company now intends to hold an EGM in July 2013 at which it will seek shareholder ratification of the placements in order to refresh Green Rock’s placement capacity.

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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 interests and projects are:

• The beneficial right to a 20% JV interest in the Backreef Area in the Canning Basin operated by Oil Basins Limited (OBL)

• A 100% interest in the L12-7 area in the Perth basin, subject to the successful completion of Native Title negotiations.

• A 50% interest in SPA 33 (the Coolcalalaya Project) in the southern Carnarvon Basin

• MoU with AWE to demonstrate the development potential of geothermal power generation in hot sedimentary aquifers in the north Perth Basin in the Mid West of WA

• 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%)