BLACK ROCK MINING LIMITED — Capital/Financing Update 2013

Apr 22, 2013

ASX Announcement

Company Announcements Office Australian Securities Exchange By e-lodgement

23 April 2013

(ASX Code GRK)

Priority Offer to GRKO Option Holders

Green Rock Energy Ltd (ASX:GRK and GRKOB) is pleased to advise that the Company will be making a priority offer (Offer) to those GRKO listed option holders (exercisable at $0.036) whose GRKO options recently expired on the 31 March 2013.

The record date for determining those option holders eligible to participate in the Offer will be the expiration date of the GRKO options (31 March 2013).

Under the Offer, each eligible option holder will have the right to subscribe for 1 new GRKOB option (exercisable at $0.012) for every 1 GRKO option held at the time of the record date.

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 completion of the Offer.

The Offer will be made pursuant to a Prospectus to be lodged with the Australian Securities and Investments Commission and the Company intends to hold an EGM in June 2013 at which it will seek shareholder approval for the Offer.

A notice of meeting is being prepared and will be dispatched to shareholders in coming weeks.

Nigel Hodder Company Secretary

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

About Green Rock Energy Limited

• 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

• Attachments 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%)