Supplemental Coal Data (Unaudited)

12 Months Ended

Dec. 31, 2011

SUPPLEMENTAL COAL DATA [Abstract]

Mineral Industries Disclosures [Text Block]

Supplemental Coal Data (unaudited)

	Millions of Tons
	For the Year Ended December 31,
	2011		2010		2009		2008		2007
Proved and probable reserves at beginning of period....................................	4,401		4,520		4,543		4,526		4,272
Purchased reserves.........................................................................................	6		4		5		—		177
Reserves sold in place....................................................................................	—		(41	)	(3	)	(12	)	(33	)
Production......................................................................................................	(63	)	(63	)	(59	)	(65	)	(65	)
Revisions and other changes..........................................................................	115		(19	)	34		94		175
Consolidated proved and probable reserves at end of period*......................	4,459		4,401		4,520		4,543		4,526
Proportionate share of proved and probable reserves of unconsolidated equity affiliates*.........................................................................................	145		172		170		171		179

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* Proved and probable coal reserves are the equivalent of “demonstrated reserves” under the coal resource classification system of the U.S. Geological Survey. Generally, these reserves would be commercially mineable at year-end prices and cost levels, using current technology and mining practices.

CONSOL Energy's coal reserves are located in nearly every major coal-producing region in North America. At December 31, 2011, 742 million tons were assigned to mines either in production, temporarily idle, or under development. The proved and probable reserves at December 31, 2011 include 3,838 million tons of steam coal reserves, of which approximately 7 percent has a sulfur content equivalent to less than 1.2 pounds sulfur dioxide per million British thermal unit (Btu), 15 percent has a sulfur content equivalent to between 1.2 and 2.5 pounds sulfur dioxide per million Btu and an additional 78 percent has a sulfur content equivalent to greater than 2.5 pounds sulfur dioxide per million BTU. The reserves also include 621 million tons of metallurgical coal in consolidated reserves, of which approximately 64 percent has a sulfur content equivalent to less than 1.2 pounds sulfur dioxide per million Btu and an additional 36 percent has a sulfur content equivalent to between 1.2 and 2.5 pounds sulfur dioxide per million Btu. A significant portion of this metallurgical coal can also serve the steam coal market.