Ownership Submission
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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  BHP BILLITON LTD
 2. Date of Event Requiring Statement (Month/Day/Year)
08/20/2011		 3. Issuer Name and Ticker or Trading Symbol
PETROHAWK ENERGY CORP [HK]
(Last)
(First)
(Middle)
180 LONSDALE STREET, MELBOURNE		 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 Original Filed(Month/Day/Year)
(Street)

VICTORIA 3000, C3 		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
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)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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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 of Derivative Security: 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

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
BHP BILLITON LTD
180 LONSDALE STREET
MELBOURNE
VICTORIA 3000, C3 		     X    
BHP Billiton Petroleum International Pty. Ltd.
BHP BILLITON CENTRE 180 LONSDALE STREET
MELBOURNE
VICTORIA 3000, C3 		     X    
BHP Billiton Petroleum Holdings LLC
1360 POST OAK BOULEVARD
SUITE 150
HOUSTON, TX 77056		     X    
BHP Billiton Petroleum Holdings (USA) Inc.
1360 POST OAK BOULEVARD
SUITE 150
HOUSTON, TX 77056		     X    
BHP Billiton Petroleum (North America) Inc.
1360 POST OAK BOULEVARD
SUITE 150
HOUSTON, TX 77056		     X    
North America Holdings II Inc.
1360 POST OAK BOULEVARD
SUITE 150
HOUSTON, TX 77056		     X    

Signatures

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

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(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.

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