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FIRST SUPPLEMENTAL INDENTURE GOVERNING

8.750% SENIOR NOTES DUE 2016

OF ARCH COAL, INC.



This FIRST SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of February 8, 2010,
among Catenary Coal Holdings, Inc., a Delaware corporation (the “Guaranteeing Subsidiary”), Arch
Coal, Inc., a Delaware corporation (the “Company”), the other Guarantors (as defined in the
Indenture referred to below) and U.S. Bank National Association, as trustee under the Indenture
referred to below (the “Trustee”).




WITNESSETH



WHEREAS, the Guaranteeing Subsidiary is a subsidiary of the Company; and



WHEREAS, Company and certain initial Guarantors have heretofore entered into an Indenture, dated
July 31, 2009 (the “Indenture”), among the Company, such initial Guarantors and the Trustee,
providing for the issuance of 8.750% Senior Notes due 2016 (the “Notes”); and



WHEREAS, the Indenture provides that the Company shall cause any Person which becomes obligated to
Guarantee the Notes, pursuant to the terms of Section 4.13 of the Indenture, to execute a
supplemental indenture pursuant to which such Person shall Guarantee the obligations of the Company
under the Notes and the Indenture in accordance with Article Ten of the Indenture with the same
effect and to the same extent as if such Person had been named in the Indenture as a Guarantor; and



WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and
deliver this Supplemental Indenture.



NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration,
the receipt of which is hereby acknowledged, the Guaranteeing Subsidiary and the Trustee mutually
covenant and agree for the equal and ratable benefit of the Holders of the Notes 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 Guaranteeing Subsidiary hereby agree to provide a Guarantee on the
terms and subject to the conditions set forth in the Indenture including, but not limited to,
Article Ten thereof. From and after the date hereof, the Guaranteeing Subsidiary shall be a
Guarantor for all purposes under the Indenture and the Notes.



3. NO RECOURSE AGAINST OTHERS. No past, present or future director, officer, employee,
incorporator, stockholder or agent of the Guaranteeing Subsidiary, as such, shall have any
liability for any obligations of the Company, the Guaranteeing Subsidiary, or any other Guarantor,
under the Notes, any Guarantee, the Indenture or this Supplemental Indenture or for any claim based
on, in respect of, or by reason of, such obligations or their creation. Each






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Holder of the Notes or any Guarantee by accepting a Note waives and releases all such liability.
The waiver and release are part of the consideration for issuance of the Notes and the Guarantee.



4. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO
CONSTRUE THIS SUPPLEMENTAL INDENTURE WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF
LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED
THEREBY.



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.



6. EFFECT OF HEADINGS. The Section headings herein are for convenience only and shall not affect
the construction hereof.



7. THE TRUSTEE. The Trustee shall not be responsible in any manner whatsoever for or in respect
of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals
contained herein, all of which recitals are made solely by the Guaranteeing Subsidiary and the
Company.




[SIGNATURE PAGES FOLLOW]







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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.




	 	 	 	 	 	 	 
	 	 	SIGNATURES	 	 
	 
	 	 	 	 	 	 
	 	 	ARCH COAL, INC.	 	 
	 	 	as Issuer	 	 
	 
	 	 	 	 	 	 
	 

	 	By:

Name:
	 	/s/ John T. Drexler
 

John T. Drexler
	 	 
	 

	 	Title:
	 	Senior Vice President and	 	 
	 

	 	 	 	Chief Financial Officer	 	 
	 
	 	 	 	 	 	 
	 	 	ALLEGHENY LAND COMPANY	 	 
	 	 	ARCH COAL SALES COMPANY, INC.	 	 
	 	 	ARCH COAL TERMINAL, INC.	 	 
	 	 	ARCH ENERGY RESOURCES, LLC	 	 
	 	 	ARCH RECLAMATION SERVICES, INC.	 	 
	 	 	ARK LAND COMPANY	 	 
	 	 	ARK LAND KH, INC.	 	 
	 	 	ARK LAND LT, INC.	 	 
	 	 	ARK LAND WR, INC.	 	 
	 	 	ASHLAND TERMINAL, INC.	 	 
	 	 	CATENARY COAL HOLDINGS, INC.	 	 
	 	 	COAL-MAC, INC.	 	 
	 	 	CUMBERLAND RIVER COAL COMPANY	 	 
	 	 	LONE MOUNTAIN PROCESSING, INC.	 	 
	 	 	MINGO LOGAN COAL COMPANY	 	 
	 	 	MOUNTAIN GEM LAND, INC.	 	 
	 	 	MOUNTAIN MINING, INC.	 	 
	 	 	MOUNTAINEER LAND COMPANY	 	 
	 	 	PRAIRIE HOLDINGS, INC.	 	 
	 	 	WESTERN ENERGY RESOURCES, INC.	 	 
	 	 	each as a Guarantor	 	 
	 
	 	 	 	 	 	 
	 

	 	By:

Name:
	 	/s/ John T. Drexler
 

John T. Drexler
	 	 
	 

	 	Title:
	 	Vice President	 	 






Signature Page to First Supplemental Indenture




 









 





	 	 	 	 	 	 	 
	 	 	U.S. BANK NATIONAL ASSOCIATION	 	 
	 	 	as Trustee	 	 
	 
	 	 	 	 	 	 
	 

	 	By:

Name:
	 	/s/ Peter C. Qui Belle
 

Peter C. Qui Belle
	 	 
	 

	 	Title:
	 	Asst. Vice President	 	 






Signature Page to First Supplemental Indenture