BLACK ROCK MINING LIMITED — Capital/Financing Update 2013

Mar 17, 2013

ASX Announcement

Company Announcements Office Australian Securities Exchange

By e-lodgement

18 March 2013

(ASX Code GRK)

Correction to Option Expiry Notice ASX:GRKO – Expiring 31 March 2013

Green Rock Energy Limited wishes to correct the Option Expiry Notice for ASX:GRKO issued on 25 February 2013 as follows:

Official quotation of GRKO Options will cease on 21 March 2013 (and not 22 March 2013 as stated in the 25 February 2013 Notice).

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Nigel Hodder Company Secretary

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

• 1.A 50% interest in SPA 33 (the Coolcalalaya Project) in the southern Carnarvon Basin Summary of the Terms of the Heads of Agreement

• 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%)