SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* BHP BILLITON LTD (Last) (First) (Middle) 180 LONSDALE STREET MELBOURNE (Street) VICTORIA 3000 C3 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 08/20/2011	3. Issuer Name and Ticker or Trading Symbol PETROHAWK ENERGY CORP [ HK ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock, par value 0.001 per share	257,942,735	I	See Footnotes(1)(2)(3)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person* BHP BILLITON LTD (Last) (First) (Middle) 180 LONSDALE STREET MELBOURNE (Street) VICTORIA 3000 C3 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BHP Billiton Petroleum International Pty. Ltd. (Last) (First) (Middle) BHP BILLITON CENTRE 180 LONSDALE STREET MELBOURNE (Street) VICTORIA 3000 C3 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BHP Billiton Petroleum Holdings LLC (Last) (First) (Middle) 1360 POST OAK BOULEVARD SUITE 150 (Street) HOUSTON TX 77056 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BHP Billiton Petroleum Holdings (USA) Inc. (Last) (First) (Middle) 1360 POST OAK BOULEVARD SUITE 150 (Street) HOUSTON TX 77056 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* BHP Billiton Petroleum (North America) Inc. (Last) (First) (Middle) 1360 POST OAK BOULEVARD SUITE 150 (Street) HOUSTON TX 77056 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* North America Holdings II Inc. (Last) (First) (Middle) 1360 POST OAK BOULEVARD SUITE 150 (Street) HOUSTON TX 77056 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. This form is a joint filing by BHP Billiton Limited, BHP Billiton Petroleum International Pty. Ltd, a wholly owned subsidiary of BHP Billiton Limited ("PTY"), BHP Billiton Petroleum Holdings LLC, a wholly owned subsidiary of PTY ("LLC"), BHP Billiton Petroleum Holdings (USA) Inc., a subsidiary jointly owned by PTY and LLC ("USA"), BHP Billiton Petroleum (North America) Inc., a wholly owned subsidiary of USA ("Parent") and North America Holdings II Inc., a wholly owned subsidiary of Parent ("Merger Sub").

2. Shares of Common Stock, par value $0.001 per share (the "Shares"), of Petrohawk Energy Corporation ("Petrohawk") acquired pursuant to the tender offer effected pursuant to the Agreement and Plan of Merger, dated as of July 14, 2011, by and among BHP Billiton Limited, Parent, Merger Sub and Petrohawk.

3. Shares were held by Merger Sub. As Merger Sub is an indirect wholly owned subsidiary of each of BHP Billiton Limited, PTY, LLC and USA and a direct wholly owned subsidiary of Parent, each of BHP Billiton Limited, PTY, LLC, USA and Parent may be deemed to have acquired indirect beneficial ownership of the Shares.

	/s/ David Williamson, Head of Group Legal & Chief Compliance Officer, BHP Billiton Limited	08/26/2011
	/s/ David Powell, Director, BHP Billiton Petroleum International Pty. Ltd.	08/26/2011
	/s/ David Powell, Vice President, BHP Billiton Petroleum Holdings LLC	08/26/2011
	/s/ David Powell, Vice President, BHP Billiton Petroleum Holdings (USA) Inc.	08/26/2011
	/s/ David Powell, Vice President, BHP Billiton Petroleum (North America) Inc.	08/26/2011
	/s/ David Powell, Vice President, North America Holdings II Inc.	08/26/2011
	** Signature of Reporting Person	Date
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