Exhibit 3.31

CERTIFICATE OF FORMATION

OF

CENTRAL STATES COAL RESERVES OF INDIANA, LLC

1. The name of the limited liability company is Central States Coal Reserves of Indiana, LLC.

2. The address of its registered office in the State of Delaware is Corporation Trust Center, 1209 Orange Street, in the City of Wilmington, County of New Castle. The name of its registered agent at such address is The Corporation Trust Company.

3. This Certificate of Formation shall be effective immediately upon filing with the Secretary of State of Delaware.

IN WITNESS WHEREOF, the undersigned has executed this Certificate of Formation of Central States Coal Reserves of Indiana, LLC this 23rd day of September 2005.

By:	/s/ Joseph Bean
	Joseph Bean, Authorized Person

STATE OF DELAWARE

CERTIFICATE OF CHANGE OF AGENT

AMENDMENT OF LIMITED LIABILITY COMPANY

The limited liability company organized and existing under the Limited Liability Company Act of the State of Delaware, hereby certifies as follows:

1. The name of the limited liability company is CENTRAL STATES COAL RESERVES OF INDIANA, LLC

2. The Registered Office of the limited liability company in the State of Delaware is changed to 2711 Centerville Road, Suite 400 (street), in the City of Wilmington Zip Code 19808. The name of the Registered Agent at such address upon whom process against this limited liability company may be served is Corporation Service Company

By:	/s/ Kenneth L. Wagner
	Authorized Person

Name:	Kenneth L. Wagner
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