BLACK ROCK MINING LIMITED — Capital/Financing Update 2013

Jun 13, 2013

ASX Announcement

Company Announcements Office Australian Securities Exchange By e-lodgement

14 June 2013

(ASX Code GRK)

Memorandum of Understanding for acquisition by Oil Basins Ltd of Green Rock Energy’s 20% interest in Backreef Area, Canning Basin

Green Rock Energy Limited (GRE, or the Company) wishes to advise that it has executed a Memorandum of Understanding (MoU) with Oil Basins Limited (ASX code OBL, or Oil Basins) for the sale of 100% of the equity of GRE’s wholly owned subsidiary Green Rock Canning Basin Pty Ltd holding a 20% beneficial interest in the Backreef Area, Canning Basin. In consideration OBL will provide GRE or its nominee with 25 million new OBL ordinary shares (escrowed for 3 calendar months) and effect adjustments to existing and future cash calls resulting in a final payment of approximately $39,000 to OBL.

Commenting on the MoU, Richard Beresford (Executive Chairman) said “This transaction is in line with GRE’s strategy to build its liquidity and continue to review new opportunities. Additionally, it will provide Green Rock with a broader exposure to the undervalued Oil Basins portfolio including Derby Block in the Canning Basin which OBL expects to be awarded soon.”

==> picture [87 x 44] intentionally omitted <==

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%)