Twelfth Supplemental Indenture-  7.75% senior notes due 2015



 Exhibit 4.3.1 
  

 CHESAPEAKE ENERGY CORPORATION 
 and 
 the Subsidiary Guarantors named herein 
  

 7.75% SENIOR NOTES DUE 2015

  

 TWELFTH SUPPLEMENTAL
INDENTURE 
 DATED AS OF OCTOBER 18, 2006 
  

 THE BANK OF NEW YORK TRUST COMPANY, N.A. 
 as Trustee 
  








 THIS TWELFTH SUPPLEMENTAL INDENTURE, dated as of October 18, 2006, 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 Trust Company, N.A., as Trustee. 
 RECITALS 
 WHEREAS, the Company, the Subsidiary Guarantors a party thereto and the Trustee entered into an Indenture, dated as of December 20, 2002, as supplemented prior to the date hereof (the
“Indenture”), pursuant to which the Company has originally issued $150,000,000 in principal amount of 7.75% Senior Notes due 2015 (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 the release of any Subsidiary Guarantor as provided for in 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 Hodges Holding Company, Inc. (“Hodges Holding”), an Oklahoma corporation, Hodges Oilfield Company
(“Hodges Oilfield”), an Oklahoma corporation, and Nomac 100 Corp. (“Nomac 100”), an Oklahoma corporation 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 Twelfth 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; 
 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 Twelfth 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
Twelfth Supplemental Indenture shall become effective immediately upon its execution and delivery by each of the Company, the Subsidiary Guarantors and the Trustee. 
  

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 ARTICLE 2 
 Section 2.01. As a result of the merger of Hodges Holding and Hodges Oilfield, with and into Hodges Trucking Company, L.L.C, an Oklahoma limited liability company (“Hodges Trucking”), which
constitutes a merger with a Subsidiary Guarantor under Section 10.02(a) of the Indenture, Hodges Holding and Hodges Oilfield, shall for all purposes be released as Subsidiary Guarantors from all 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 Hodges Holding and Hodges Oilfield and the signatures of Officers of Hodges Holding and
Hodges Oilfield. 
 Section 2.02. As the surviving entity in its merger with Hodges Holding and Hodges Oilfield and as a
Subsidiary Guarantor, Hodges Trucking hereby agrees to assume all of the obligations of Hodges Holding and Hodges Oilfield. 
 Section 2.03. As a result of the merger of Nomac 100, with and into Nomac Drilling Corporation, an Oklahoma corporation (“Nomac Drilling”), which constitutes a merger with a Subsidiary Guarantor under
Section 10.02(a) of the Indenture, Nomac 100, shall for all purposes be released as a Subsidiary Guarantor from all 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 name of Nomac 100 and the signature of an Officer of Nomac 100. 
 Section 2.04. As the surviving entity in its merger with Nomac 100 and as a Subsidiary Guarantor, Nomac Drilling hereby agrees to assume all of the obligations of Nomac 100. 
 ARTICLE 3 
 Section 3.01.
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 3.02. 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 Twelfth Supplemental Indenture. This Twelfth 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. 
  

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 Section 3.03. THE LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE AND
ENFORCE THIS TWELFTH SUPPLEMENTAL INDENTURE. 
 Section 3.04. The parties may sign any number of copies of this Twelfth
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 Twelfth Supplemental Indenture to be duly
executed, all as of the date first written above. 
  

	
	 /s/ Martha A. Burger

	Martha A. Burger
	
	Treasurer and Senior Vice President - Human Resources of the Company and of the Subsidiaries listed below:
	
	Corporate Subsidiaries:
	
	CHESAPEAKE EAGLE CANADA CORP.
	 CHESAPEAKE ENERGY LOUISIANA
     CORPORATION

	CHESAPEAKE SOUTH TEXAS CORP.
	NOMAC DRILLING CORPORATION
	
	CHESAPEAKE OPERATING, INC.,
	On behalf of itself and, as general partner, the following limited partnerships:
	
	CHESAPEAKE EXPLORATION LIMITED
	    PARTNERSHIP
	CHESAPEAKE LOUISIANA, L.P.
	CHESAPEAKE SIGMA, 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 APPALACHIA, L.L.C.
	CHESAPEAKE LAND COMPANY, L.L.C.
	CHESAPEAKE ORC, L.L.C.
	CHESAPEAKE ROYALTY, L.L.C.
	GOTHIC PRODUCTION, L.L.C.
	HAWG HAULING & DISPOSAL, L.L.C.
	HODGES TRUCKING COMPANY, L.L.C.
	MAYFIELD PROCESSING, L.L.C.
	MC MINERAL COMPANY, L.L.C.


  

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	W.W. REALTY, L.L.C.
	
	TRUSTEE:
	
	 THE BANK OF NEW YORK TRUST COMPANY,
 N.A., as
Trustee

		
	By:	 	 /s/ Linda Garcia

	Name:	 	Linda Garcia
	Title:	 	Assistant Vice President


  

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