Document:

Thirteenth Supplemental Indenture

 Exhibit 4.3.1 
  

  
 CHESAPEAKE ENERGY CORPORATION 
  
 and 
  
 the Subsidiary Guarantors named herein 
  

  
 8 1/8% SENIOR NOTES DUE 2011 
  

  
 THIRTEENTH SUPPLEMENTAL INDENTURE 
  
 DATED AS OF JANUARY 31, 2005 
  

  
 THE BANK OF NEW YORK 
  
 as successor Trustee to 
  
 United
States Trust Company of New York 
  

 THIS THIRTEENTH SUPPLEMENTAL INDENTURE, dated as of January 31, 2005, is among Chesapeake Energy
Corporation, an Oklahoma corporation (the “Company”), each of the parties identified under the caption “Subsidiary Guarantors” on the signature page hereto (the “Subsidiary Guarantors”) and
The Bank of New York, as successor to United States Trust Company of New York, as Trustee. 
  
 RECITALS 
  
 WHEREAS, the
Company, the Subsidiary Guarantors a party thereto and the Trustee entered into an Indenture, dated as of April 6, 2001, as supplemented prior to the date hereof (the “Indenture”), pursuant to which the Company has originally
issued $800,000,000 in principal amount of 8 1/8% Senior Notes due 2011 (the “Notes”); and 
  
 WHEREAS, Section 9.01(3) of the Indenture provides that the Company, the Subsidiary Guarantors and the Trustee may amend or supplement the Indenture
without notice to or consent of any Holder to reflect: (a) the addition of any Subsidiary Guarantor, as provided for in the Indenture, and (b) the release of any Subsidiary Guarantor as provided for in the Indenture; and 
  
 WHEREAS, the Board of Directors of the Company has designated Chesapeake Land
Company, L.L.C., as a Restricted Subsidiary of the Company and desires to add the entity as a Subsidiary Guarantor under the Indenture; and 
  
 WHEREAS, the Company has taken all actions required to effect the release, pursuant to Sections 10.02 and 10.04 of the Indenture, of Chesapeake BNR Corp.,
an Oklahoma corporation (“BNR”), Chesapeake Focus, L.L.C., an Oklahoma limited liability company (“Focus”), Chesapeake KNAN Acquisition, L.L.C., an Oklahoma limited liability company (“KNAN”), Chesapeake Mountain Front,
L.L.C., an Oklahoma limited liability company (“Mountain Front”), Sap Acquisition, L.L.C., an Oklahoma limited liability company (“Sap”), Chesapeake LNG, L.P., an Oklahoma limited partnership (“LNG”), and Chesapeake
Panhandle Limited Partnership, an Oklahoma limited partnership (“Panhandle”)as Subsidiary Guarantors; 
  
 WHEREAS, all acts and things prescribed by the Indenture, by law and by the charter and the bylaws (or comparable constituent documents) of the Company,
of the Subsidiary Guarantors and of the Trustee necessary to make this Thirteenth Supplemental Indenture a valid instrument legally binding on the Company, the Subsidiary Guarantors and the Trustee, in accordance with its terms, have been duly done
and performed; 
  

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 NOW, THEREFORE, to comply with the provisions of the Indenture and in consideration of the above
premises, the Company, the Subsidiary Guarantors and the Trustee covenant and agree for the equal and proportionate benefit of the respective Holders of the Notes as follows: 
  
 ARTICLE 1 
  
 Section 1.01. This Thirteenth Supplemental Indenture is supplemental to the Indenture and does and shall be deemed to form a part of, and shall be
construed in connection with and as part of, the Indenture for any and all purposes. 
  
 Section 1.02. This Thirteenth Supplemental Indenture shall become effective immediately upon its execution and delivery by the Company, the Subsidiary Guarantors and the Trustee. 
  
 ARTICLE 2 
  
 Section 2.01. From this date, in accordance with Section 10.03 of the Indenture and by executing this Thirteenth
Supplemental Indenture, Chesapeake Land Company, L.L.C., an Oklahoma limited liability company, is subject to the provisions of the Indenture as a Subsidiary Guarantor to the extent provided for in Article Ten thereunder. 
  
 ARTICLE 3 
  
 Section 3.01. As a result of the merger of BNR, Focus, KNAN, Mountain Front, Sap, LNG, and Panhandle, with and into
Chesapeake Exploration Limited Partnership, an Oklahoma limited partnership (“CELP”), which constitutes a merger with a Subsidiary Guarantor under Section 10.02(a) of the Indenture, BNR, Focus, KNAN, Mountain Front, Sap, LNG, and Panhandle
shall for all purposes be released as a Subsidiary Guarantors from all of their Guarantees and related obligations in the Indenture, pursuant to Section 10.04 of the Indenture. The notation on the Securities relating to the Guarantee shall be deemed
to exclude the names of BNR, Focus, KNAN, Mountain Front, Sap, LNG, and Panhandle; the signature of an Officer of each of BNR, Focus, KNAN, Mountain Front, and Sap; and the signature of an Officer of Chesapeake Operating, Inc. on behalf of LNG and
Panhandle. 
  
 Section 3.02. As the surviving entity in its
merger with BNR, Focus, KNAN, Mountain Front, Sap, LNG, and Panhandle and a Subsidiary Guarantor, CELP hereby agrees to assume all of the obligations of BNR, Focus, KNAN, Mountain Front, Sap, LNG, and Panhandle. 
  
 ARTICLE 4 
  
 Section 4.01. Except as specifically modified herein, the Indenture and the Notes are in all respects ratified and
confirmed (mutatis mutandis) and shall remain in full force and effect in accordance with their terms with all capitalized terms used herein without definition having the same respective meanings ascribed to them as in the Indenture.

  
 Section 4.02. Except as otherwise expressly provided
herein, no duties, responsibilities or liabilities are assumed, or shall be construed to be assumed, by the 

  

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Trustee by reason of this Thirteenth Supplemental Indenture. This Thirteenth 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. 
  
 Section 4.03. The Company hereby notifies the Trustee that Chesapeake
Land Company, L.L.C., has been designated by the Board of Directors of the Company as a Restricted Subsidiary (as that term is defined in the Indenture). 
  
 Section 4.04. THE LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE AND ENFORCE THIS THIRTEENTH SUPPLEMENTAL INDENTURE. 

 
 Section 4.05. The parties may sign any number of copies of this
Thirteenth Supplemental Indenture. Each signed copy shall be an original, but all of such executed copies together shall represent the same agreement. 
  
 [NEXT PAGE IS SIGNATURE PAGE] 
  

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

	
	 /s/ Aubrey K. McClendon

	Aubrey K. McClendon
	
	Chief Executive Officer of the Company and of the Subsidiaries listed below:
	
	Corporate Subsidiaries:
	
	 CHESAPEAKE ENERGY LOUISIANA
     CORPORATION

	CHESAPEAKE PRH CORP.
	CHESAPEAKE SOUTH TEXAS CORP.
	NOMAC DRILLING CORPORATION
	OXLEY PETROLEUM CO.
	
	CHESAPEAKE OPERATING, INC.,
	On behalf of itself and, as general partner, the following limited partnerships:
	
	 CHESAPEAKE EXPLORATION LIMITED
     PARTNERSHIP

	CHESAPEAKE LOUISIANA, L.P.
	CHESPEAKE NFW, L.P.
	CHESAPEAKE PERMIAN, L.P.
	CHESAPEAKE SIGMA, L.P.
	CHESAPEAKE-STAGHORN ACQUISITION, L.P.
	CHESAPEAKE ZAPATA, L.P.
	
	CHESAPEAKE ENERGY MARKETING, INC.,
	On behalf of itself and, as general partner, the following limited partnerships:
	
	MIDCON COMPRESSION, L.P.
	
	Limited Liability Company Subsidiaries:
	
	CARMEN ACQUISITION, L.L.C.
	CHESAPEAKE ACQUISITION, L.L.C.
	CHESAPEAKE ENO ACQUISITION, L.L.C.
	CHESAPEAKE EP, L.L.C.

  

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	CHESAPEAKE LAND COMPANY, L.L.C.
	CHESAPEAKE ORC, L.L.C.
	CHESAPEAKE PERMIAN ACQUISITION, L.L.C.
	CHESAPEAKE ROYALTY, L.L.C.
	GOTHIC PRODUCTION, L.L.C.
	JOHN C. OXLEY, L.L.C.
	MC MINERAL COMPANY, L.L.C.
	MAYFIELD PROCESSING, L.L.C.

  

			
	TRUSTEE:
	
	THE BANK OF NEW YORK, as successor to United States Trust Company of New York, as Trustee
		
	By:	 	 /s/ Steven D. Torgeson

	Name:	 	Steven. D. Torgeson
	Title:	 	Vice President

  

 - 6 -Tenth Supplemental Indenture

 Exhibit 4.4.1 
  
 TENTH SUPPLEMENTAL INDENTURE 
  

TENTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of December 21, 2004 is by and among Chesapeake Energy Corporation, an
Oklahoma corporation (the “Company”), the Subsidiary Guarantors (as defined in the Indenture referred to herein), and The Bank of New York as trustee under the Indenture referred to below (the “Trustee”). All capitalized terms
not defined herein shall have the meaning ascribed to them in the Indenture. 
  
 WHEREAS, the Company has heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of November 5, 2001, and such Indenture was supplemented and amended by (i) the First
Supplemental Indenture dated December 17, 2001, (ii) the Second Supplemental Indenture dated June 28, 2002, (iii) the Third Supplemental Indenture dated July 8, 2002, (iv) the Fourth Supplemental Indenture dated February 14, 2003, (v) the Fifth
Supplemental Indenture dated May 1, 2003, (vi) the Sixth Supplemental Indenture dated August 15, 2003, (vii) the Seventh Supplemental Indenture dated March 5, 2004, (viii) the Eighth Supplemental Indenture dated August 30, 2004, and (ix) the Ninth
Supplemental Indenture dated September 27, 2004. 
  
 WHEREAS, on
November 5, 2001, the Company issued $250,000,000 aggregate principal amount of its 8.375% Senior Notes due 2008; 
  
 WHEREAS, Section 9.01(3) of the Indenture provides that the Company, the Subsidiary Guarantors and the Trustee may amend or supplement the Indenture
without notice to or consent of any Holder to reflect the release of any Subsidiary Guarantor as provided for in the Indenture; 
  
 WHEREAS, the Company has taken all actions required to effect the release, pursuant to Sections 10.02 and 10.04 of the Indenture, of Chesapeake Panhandle
Limited Partnership (“CPLP”) as Subsidiary Guarantor; 
  
 WHEREAS, Section 9.02 of the Indenture provides that, with the consent of the Holders of a majority in aggregate principal amount of the Notes then outstanding (including consents obtained in connection with a tender offer for the Notes),
the Company, when authorized by a resolution of its Board of Directors, and the Trustee may enter into a supplemental to the Indenture for the purpose of amending or supplementing any provisions of the Indenture (with certain exceptions not relevant
to this Supplemental Indenture); 
  
 WHEREAS, the Company and the
Subsidiary Guarantors desire and have requested the Trustee to join with them in entering into this Supplemental Indenture for the purpose of amending the Indenture to remove certain covenants and events of default as permitted by Section 9.02 of
the Indenture; 
  
 WHEREAS, the Company has solicited consents to
this Supplemental Indenture upon the terms and subject to the conditions set forth in its Offer to Purchase and Consent Solicitation Statement dated November 12, 2004 and the related Letter of Transmittal and Consent (which together constitute the
“Tender Offer”); 
  
 WHEREAS, the Company (1) has
received the consent of the Holders of more than 50% in aggregate principal amount of the outstanding Notes, (2) has delivered to the Trustee an 

  

 G-1 

 
Opinion of Counsel relating to this Supplemental Indenture as contemplated by Section 9.06 of the Indenture and (3) has satisfied all other conditions
required under Article 9 of the Indenture to enable the Company and the Trustee to enter into this Supplemental Indenture. 
  
 NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the Company, the Subsidiary Guarantors and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders as follows: 
  
 ARTICLE I 
 SUBSIDIARY GUARANTOR

  
 1.1 Merger of Subsidiary. As a result of the merger
of CPLP, with and into Chesapeake Exploration Limited Partnership (“CELP”), an Oklahoma limited partnership, which constitutes a merger with a Subsidiary Guarantor under Section 10.02(a) of the Indenture, CPLP shall for all purposes be
released as a Subsidiary Guarantor from all of its Guarantee and related obligations in the Indenture, pursuant to Section 10.04 of the Indenture The notation on the Securities relating to the Guarantee shall be deemed to exclude the name of CPLP
and the signature of an Officer of CPLP on its behalf. 
  
 1.2
Surviving Entity. As the surviving entity in its merger with CPLP and a Subsidiary Guarantor, CELP hereby agrees to assume all of the obligations of CPLP. 
  
 ARTICLE II 
 DEFINITIONS 
  
 2.1 Deletion of Definitions and
Related References. Section 1.1 of Article 1 of the Indenture is hereby amended to delete in their entirety all terms and their respective definitions for which all references are eliminated in the Indenture as a result of the amendments set
forth in Article III of this Supplemental Indenture. 
  
 ARTICLE
III 
 AMENDMENTS TO INDENTURE 
  
 3.1 Amendments to Articles 4, 5 and 6. The Indenture is hereby amended by deleting the following sections of the Indenture and all references
thereto in their entirety: Section 4.2 (SEC Reports); Section 4.3 (Compliance Certificates); Section 4.4 (Maintenance of an Office or Agency); Section 4.5 (Corporate Existence) Section 4.6 (Waiver of
Stay, Extension or Usury Laws); Section 4.7 (Payment of Taxes and Other Claims); Section 4.8 (Maintenance of Properties and Insurance); Section 4.9 (Limitation on Liens); Section 4.10 (Limitation on Restricted Payments);
Section 4.11 (Limitation on Sale of Assets); Section 4.12 (Limitation on Liens Securing Indebtedness); Section 4.13 (Limitation on Sale/Leaseback Transactions); Section 4.14 (Limitation on Payment Restrictions Affecting Subsidiaries); Section
4.15 (Limitation on Transactions with Affiliates); Section 4.16 (Change of Control); Section 5.1 (When Company May Merge, etc.) and each of subsections (4), (5), (6), (8) and (9) of Section 6.1 (Events of Default). 

 ARTICLE IV 
 MISCELLANEOUS 
  
 4.1
Definitions. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture. For all purposes of this Supplemental Indenture, except as otherwise herein expressly provided or unless the context
otherwise requires, the words “herein,” “hereof” and “hereby” and other words of similar import used in this Supplemental Indenture refer to this Supplemental Indenture as a whole and not to any particular section
hereof. 
  
 4.2 Ratification of Indenture; Supplemental
Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture
shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered under the Indenture shall be bound hereby and all terms and conditions of both shall be read together as though they
constitute a single instrument, except that in the case of conflict the provisions of this Supplemental Indenture shall control. 
  
 4.3 Endorsement and Change of Form of Notes. Any Notes authenticated and delivered after the close of business on the date that this Supplemental
Indenture becomes operative in substitution for Notes then outstanding and all Notes presented or delivered to the Trustee on and after that date for such purpose shall be stamped, imprinted or otherwise legended by the Trustee, with a notation as
follows: 
  
 “Effective as of December 14,
2004 certain restrictive covenants of the Company and certain Events of Default have been eliminated or limited, as provided in the Tenth Supplemental Indenture, dated as of December 14, 2004. Reference is hereby made to said Tenth Supplemental
Indenture, copies of which are on file with the Trustee, for a description of the amendments made therein.” 
  
 4.4 Governing Law. This Supplemental Indenture shall be governed by and construed in accordance with the laws of the State of New York. 

 
 4.5 Trustee Makes No Representation. The Trustee makes no
representation as to the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which are made solely by the Company and the Guarantors. 
  
 4.6 Counterparts. The parties may sign any number of copies or
counterparts of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. 
  
 4.7 Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction thereof. 
  
 [remainder of page intentionally left blank] 

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

			
	COMPANY:
	
	CHESAPEAKE ENERGY CORPORATION
		
	 By:
	 	 /s/ Aubrey K. McClendon

	 Name:
	 	 Aubrey K. McClendon

	 Title:
	 	 Chief Executive Officer

	
	SUBSIDIARY GUARANTORS:
	
	CHESAPEAKE BNR CORP.
	 CHESAPEAKE ENERGY LOUISIANA CORPORATION

	 CHESAPEAKE ENERGY MARKETING, INC.

	 CHESAPEAKE OPERATING, INC.

	 CHESAPEAKE PRH CORP.

	 CHESAPEAKE SOUTH TEXAS CORP.

	 NOMAC DRILLING CORPORATION

	 OXLEY PETROLEUM CO.

	 CARMEN ACQUISITION, L.L.C.

	 CHESAPEAKE ACQUISITION, L.L.C.

	 CHESAPEAKE ENO ACQUISITION, L.L.C.

	 CHESAPEAKE EP, L.L.C.

	 CHESAPEAKE FOCUS, L.L.C.

	 CHESAPEAKE KNAN ACQUISITION, L.L.C.

	 CHESAPEAKE MOUNTAIN FRONT, L.L.C.

	 CHESAPEAKE ORC, L.L.C.

	 CHESAPEAKE PERMIAN ACQUISITION, L.L.C.

	 CHESAPEAKE ROYALTY, L.L.C.

	 GOTHIC PRODUCTION, L.L.C.

	 JOHN C. OXLEY, L.L.C.

	 MAYFIELD PROCESSING, LLC

	 MC MINERAL COMPANY, L.L.C.

	 SAP ACQUISITION, L.L.C.

		
	 By:
	 	 /s/ Aubrey K. McClendon

	 Name:
	 	 Aubrey K. McClendon

	 Title:
	 	 Chief Executive Officer

			
	 CHESAPEAKE EXPLORATION LIMITED PARTNERSHIP

	 CHESAPEAKE LNG, L.P.

	 CHESAPEAKE LOUISIANA, L.P.

	 CHESAPEAKE NFW, L.P.

	 CHESAPEAKE PERMIAN, L.P.

	 CHESAPEAKE SIGMA, L.P.

	 CHESAPEAKE ZAPATA, L.P.

	 CHESAPEAKE-STAGHORN ACQUISITION L.P.

		
	By:	 	Chesapeake Operating, Inc., as general partner of each representative entity
		
	 By:
	 	 /s/ Aubrey K. McClendon

	 Name:
	 	 Aubrey K. McClendon

	 Title:
	 	 Chief Executive Officer

	
	MIDCON COMPRESSION, L.P.
		
	By:	 	Chesapeake Energy Marketing, Inc., as general partner
		
	 By:
	 	 /s/ Aubrey K. McClendon

	 Name:
	 	 Aubrey K. McClendon

	 Title:
	 	 Chief Executive Officer

	
	TRUSTEE:
	
	THE BANK OF NEW YORK
		
	 By:
	 	 /s/ Steven D. Torgeson

	 Name:
	 	 Steven D. Torgeson

	 Title:
	 	 Vice President

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