Document:

Second Supplemental Indenture

 Exhibit 4.18 
 SECOND SUPPLEMENTAL INDENTURE 
 SECOND SUPPLEMENTAL INDENTURE (this “Supplemental
Indenture”), dated as of January 26, 2009, among Winwell Resources, L.L.C., a Louisiana limited liability company, and KCS Resources, LLC, a Delaware limited liability company (the “New Guarantors”), Petrohawk Energy
Corporation, a Delaware corporation (the “Company”), the existing Guarantors (as defined in the Indenture referred to herein) and U.S. Bank Trust National Association, as trustee under the Indenture referred to herein (the
“Trustee”). The New Guarantors and the existing Guarantors are sometimes referred to collectively herein as the “Guarantors,” or individually as a “Guarantor.” 
 W I T N E S S E T H 
 WHEREAS, the
Company and the existing Guarantors have heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of May 13, 2008, relating to the 7.875% Senior Notes due 2015 (the
“Securities”) of the Company; 
 WHEREAS, existing Guarantors Winwell Resources Inc., a Louisiana corporation, has been
converted to a Louisiana limited liability company and KCS Resources Inc., a Delaware corporation, has been converted to a Delaware limited liability company; 
 WHEREAS, as a result of the conversion, Winwell Resources Inc. is now Winwell Resources, L.L.C. and KCS Resources Inc. is now KCS Resources, LLC; 
 WHEREAS, Winwell Resources, L.L.C. and KCS Resources, LLC are hereby executing this supplement to clarify that, as successor entities to Winwell
Resources Inc. and KCS Resources Inc., respectively, they are Guarantors to the Indenture and replace their predecessors Winwell Resources Inc. and KCS Resources Inc., respectively, as Guarantors; and 
 WHEREAS, pursuant to Section 9.1 of the Indenture, the Company, the Guarantors and the Trustee are authorized to execute and deliver this
Supplemental Indenture to amend or supplement the Indenture without the consent of any Holder. 
 NOW THEREFORE, to comply with the
provisions of the Indenture and in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the New Guarantors, the other Guarantors, the Company and the Trustee mutually covenant and
agree for the equal and ratable benefit of the Holders of the Securities as follows: 
 1. CAPITALIZED TERMS. Capitalized terms used herein
without definition shall have the meanings assigned to them in the Indenture. 
 2. AGREEMENT TO GUARANTEE. The New Guarantors hereby agree,
jointly and severally, with all other Guarantors, to unconditionally Guarantee to each Holder and to the Trustee the Obligations, to the extent set forth in the Indenture and subject to the provisions in the Indenture. The obligations of the
Guarantors to the Holders of Securities and to the Trustee pursuant to the Subsidiary Guarantees and the Indenture are expressly set forth in Article X of the Indenture and reference is hereby made to the Indenture for the precise terms of
the Subsidiary Guarantees. 

 3. EXECUTION AND DELIVERY. The New Guarantors agree that its Subsidiary Guarantee shall remain in full
force and effect notwithstanding any failure to endorse on each Security a notation of such Subsidiary Guarantee. 
 4. NEW YORK LAW TO
GOVERN. THE LAWS OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE AND ENFORCE THIS SUPPLEMENTAL INDENTURE. 
 5. COUNTERPARTS.
The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. This Supplemental Indenture may be executed in multiple counterparts which, when
taken together, shall constitute one instrument. 
 6. EFFECT OF HEADINGS. The Section headings herein are for convenience only and shall not
affect the construction hereof. 
 7. THE TRUSTEE. Except as otherwise expressly provided herein, no duties, responsibilities or liabilities
are assumed, or shall be construed to be assumed, by the Trustee by reason of this Supplemental Indenture. This Supplemental Indenture is executed and accepted by the Trustee subject to all the terms and conditions set forth in the Indenture with
the same force and effect as if those terms and conditions were repeated at length herein and made applicable to the Trustee with respect hereto. 
 [Remainder of Page Intentionally Left Blank; Signature Page Follows] 
  

 2 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and
attested, all as of the date first above written. 
  

			
	WINWELL RESOURCES, L.L.C.
		
	By:	 	 /s/ David S. Elkouri

		 	David S. Elkouri
		 	Secretary
	
	KCS RESOURCES, L.L.C.
		
	By:	 	 /s/ David S. Elkouri

		 	David S. Elkouri
		 	Secretary
	
	P-H ENERGY, LLC
	PETROHAWK OPERATING COMPANY
	HAWK FIELD SERVICES, L.L.C.
	WSF, INC.
	KCS ENERGY SERVICES, INC.
	 MEDALLION CALIFORNIA PROPERTIES COMPANY

	PROLIQ, INC.
	ONE TEC, LLC
	ONE TEC OPERATING, LLC
	BISON RANCH LLC
		
	By:	 	 /s/ David S. Elkouri

		 	David S. Elkouri
		 	Executive Vice President – General Counsel and Secretary
	
	HK ENERGY MARKETING, LLC
		
	By:	 	 /s/ David S. Elkouri

		 	David S. Elkouri
		 	Secretary

			
	PETROHAWK HOLDINGS, LLC
		
	By:	 	 /s/ David S. Elkouri

		 	David S. Elkouri
		 	Vice President, Treasurer and Assistant Secretary
	
	PETROHAWK PROPERTIES, LP
		
	By:	 	P-H Energy, LLC
		 	Its General Partner
		
	By:	 	 /s/ David S. Elkouri

		 	David S. Elkouri
		 	Executive Vice President – General Counsel and Secretary
	
	PETROHAWK ENERGY CORPORATION
		
	By:	 	 /s/ David S. Elkouri

		 	David S. Elkouri
		 	Executive Vice President – General Counsel and Secretary
	
	U.S. BANK TRUST NATIONAL ASSOCIATION, as Trustee
		
	By:	 	 /s/ William W. MacMillan

	Name:	 	William W. MacMillan
	Title:	 	Vice PresidentAssumption Agreement dated November 21, 2008

 Exhibit 10.41 
 ASSUMPTION AGREEMENT 
 ASSUMPTION AGREEMENT, dated as of November 21st, 2008, made by HK Energy
Marketing, LLC, a limited liability company duly formed and existing under the laws of the state of Delaware (the “Additional Grantor”), in favor of BNP Paribas, as administrative agent (in such capacity, the “Administrative
Agent”) for the banks and other financial institutions (the “Lenders”) parties to the Credit Agreement referred to below. All capitalized terms not defined herein shall have the meaning ascribed to them in such Credit
Agreement. 
 W I T N E S S E T H: 
 WHEREAS, Petrohawk Energy Corporation (the “Borrower”), the Lenders, the Administrative Agent and the other Agents, have entered into the Third Amended and Restated Senior Revolving Credit Agreement, dated as of
September 10, 2008 (as amended, supplemented or otherwise modified from time to time, the “Credit Agreement”); 
 WHEREAS, in connection with the Credit Agreement, the Borrower and certain of its Subsidiaries have entered into the Third Amended and Restated Guarantee and Collateral Agreement, dated as of September 10, 2008 (as amended,
supplemented or otherwise modified from time to time, the “Guarantee and Collateral Agreement”) in favor of the Administrative Agent for the benefit of the Lenders and Affiliates of the Lenders; 
 WHEREAS, the Credit Agreement requires the Additional Grantor to become a party to the Guarantee and Collateral Agreement; and 
 WHEREAS, the Additional Grantor has agreed to execute and deliver this Assumption Agreement in order to become a party to the Guarantee and Collateral
Agreement; 
 NOW, THEREFORE, IT IS AGREED: 
 1.
Guarantee and Collateral Agreement. By executing and delivering this Assumption Agreement, the Additional Grantor, as provided in Section 10.13 of the Guarantee and Collateral Agreement, hereby becomes a party to the Guarantee and
Collateral Agreement as a Grantor thereunder with the same force and effect as if originally named therein as a Grantor and, without limiting the generality of the foregoing, hereby expressly assumes all obligations and liabilities of a Grantor
thereunder and expressly grants to the Administrative Agent, for the benefit of the Secured Parties (as defined in the Guarantee and Collateral Agreement), a security interest in all Collateral owned by such Additional Grantor to secure all of such
Additional Grantor’s obligations and liabilities thereunder. The information set forth in Annex 1-A hereto is hereby added to the information set forth in Schedules 1 through 5 to the Guarantee and Collateral Agreement. The Additional Grantor
hereby represents and warrants that each of the representations and warranties contained in Article IV of the Guarantee and Collateral Agreement is true and correct on and as the date hereof (after giving effect to this Assumption Agreement) as if
made on and as of such date. 

 2. Governing Law. THIS ASSUMPTION AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE
WITH, THE LAW OF THE STATE OF TEXAS. 
 IN WITNESS WHEREOF, the undersigned has caused this Assumption Agreement to be duly executed and
delivered as of the date first above written. 
  

			
	HK ENERGY MARKETING, LLC
		
	By:	 	 /s/ Stephen W. Herod

	Name:	 	Stephen W. Herod
	Title:	 	President

 ANNEX 1-A 
 Schedule 1 
 NOTICE ADDRESSES OF GRANTORS 
  

	1.	HK Energy Marketing, LLC 

 Delaware limited liability
company 
 Notice Address: 
 Attn:
Stephen W. Herod 
 1000 Louisiana, Suite 5810 
 Houston, Texas 77002 
 Telephone: (832) 204-2700 
 Facsimile: (832) 204-2800 

 Schedule 2 
 DESCRIPTION OF PLEDGED SECURITIES 
 Pledged Securities: 
 None. 

 Schedule 3 
 FILINGS AND OTHER ACTIONS 
 REQUIRED TO PERFECT SECURITY INTERESTS 
 Uniform Commercial Code Filings 
 1. Financing
Statements in respect of the Third Amended and Restated Guaranty and Collateral Agreement dated as of September 10, 2008 by the Borrower, the Restricted Subsidiaries party thereto as Guarantors, in favor of the Administrative Agent and the
Lenders for the following entities: 
  

	 	(a)	HK Energy Marketing, LLC (Delaware) 

 2. Stock Powers for the following
entities: 
  

	 	(a)	HK Energy Marketing, LLC (Delaware) 

 3. Delivery to Administrative Agent
of Pledged Securities 
  

	 	(a)	HK Energy Marketing, LLC (Delaware) 

 Schedule 4 
 CORRECT LEGAL NAME, LOCATION OF JURISDICTION OF 
 ORGANIZATION, ORGANIZATIONAL IDENTIFICATION
NUMBER, TAXPAYOR IDENTIFICATION 
 NUMBER AND CHIEF EXECUTIVE OFFICE 
  

							
	1.        	 	HK Energy Marketing, LLC	  		  	
		 	a Delaware limited liability company	  		  	
		 	Notice Address:	  		  	
		 	Organizational Identification Number:	  	4618598	  	
		 	Taxpayor Identification Number:	  	86-0876964	  	
		 	Chief Executive Office:	  	1000 Louisiana, Suite 5810	  	
		 		  	Houston, Texas 77002	  	

 Schedule 5 
 PRIOR NAMES AND PRIOR CHIEF EXECUTIVE OFFICE 
  

							
	3.      	 	HK Energy Marketing, LLC	  		  	
		 	Prior Names:	  	None	  	
		 	Prior Chief Executive Office:	  	None

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