BLACK ROCK MINING LIMITED — Major Shareholding Notification 2008

May 18, 2008

FORM 603 Corporations Act 2001 Section 671B

NOTICE OF INITIAL SUBSTANTIAL HOLDER

To: Company Name/Scheme

GRK - Green Rock Energy Limited

ACN/ARSN

094551336

1. Details of Substantial Holder(1)

Name Acorn Capital Limited ACN/ARSN (if applicable) 082 694 531 The holder became a substantial holder on 28-Apr-2008

2. Details of Voting Power

The total number of votes attached to all the voting shares in the company or voting interests in the scheme that the substantial holder or an associate (2) had a relevant interest (3) in on the date the substantial holder became a substantial holder are as follows:

Class of Securities (4)	Number of Securities	Person's Votes (5)	Voting Power (6)
Ordinary	15,000,000	15,000,000	8.32%

3. Details of Relevant Interests

The nature of the relevant interest the substantial holder or an associate had in the following voting securities on the date the substantial holder became a substantial holder are as follows:

Holder of Relevant Interest	Nature of Relevant Interest (7)	Class and Number of Securities
Acorn Capital Limited	Power to (or to control) exercise vote and/ordispose of the shares as discretionary	15,000,000
	investment managers or advisers to
	superannuation funds, pooled
	superannuation trusts, managed investment
	schemes and investment management
	agreements.

4. Details of Present Registered Holders

The persons registered as holders of the securities referred to in Paragraph 3 above are as follows:

Holder of Relevant Interest	Registered Holder of Securities	Person Entitled to be	Class and Number of
		Registered as Holder (8)	Securities
Qantas Superannuation	National Nominees		4,450,000
UniSuper	National Nominees		10,550,000

5. Consideration

The consideration paid for each relevant interest referred to in paragraph 3 above, and acquired in the four months prior to the day that the substantial holder became a substantial holder is as follows:

	consideration paid for each relevant interesttantial holder became a substantial holder is	consideration paid for each relevant interesttantial holder became a substantial holder is	referred to in paragraph 3 aas follows:	referred to in paragraph 3 aas follows:	bove, and acquired in the four months prior to the day that t	bove, and acquired in the four months prior to the day that t	bove, and acquired in the four months prior to the day that t	bove, and acquired in the four months prior to the day that t
Holder of Relevant InterestAcorn Capital Limited	f Rlt Itt	Dt f Aiiti		Consid	eration (9)		Class and Number of Securitie	s
	er o eevan neres	ae o cqus	n
				Cash		Non-Cash
		23-Apr-2008 to 28-Apr-2008		$1,500,000.00

6. Associates

The reasons the persons named in Paragraph 3 above are associates of the substantial holder are as follows:

Name and ACN/ARSN (if applicable) Name of Association

7. Addresses

The addresses of persons named in this form are as follows:

Name		Address
Qantas Superannuation		C/O Acorn Capital Limited, Level 12, 90 Collins Street, Melbourne Victoria 3000
UniSuper		C/O Acorn Capital Limited, Level 12, 90 Collins Street, Melbourne Victoria 3000

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----- Start of picture text ----- Print Name BARRY FAIRLEY Capacity Managing Director19-May-2008Sign Here Date----- End of picture text -----