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Supplemental Coal Data (Unaudited)
 12 Months Ended
Dec. 31, 2013
SUPPLEMENTAL COAL DATA [Abstract]  
Mineral Industries Disclosures [Text Block]
Supplemental Coal Data (unaudited)

 
 
Millions of Tons
 
 
For the Year Ended December 31,
 
 
2013

 
2012

 
2011

 
2010

 
2009

Proved and probable reserves at beginning of period
 
4,229

 
4,314

 
4,229

 
4,350

 
4,372

Purchased reserves
 
1

 
—

 
6

 
4

 
5

Reserves sold in place
 
(1,199
)
 
(155
)
 
—

 
(41
)
 
(3
)
Production
 
(55
)
 
(55
)
 
(62
)
 
(62
)
 
(58
)
Revisions and other changes
 
56

 
125

 
141

 
(22
)
 
34

Consolidated proved and probable reserves at end of period*
 
3,032

 
4,229

 
4,314

 
4,229

 
4,350

 
 
 
 
 
 
 
 
 
 
 
Proportionate share of proved and probable reserves of unconsolidated equity affiliates*
 
57

 
41

 
145

 
172

 
170

______________
*    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. Proved and probable reserves of unconsolidated equity affiliates are included in this number.
CONSOL Energy's coal reserves are located in nearly every major coal-producing region in North America. At December 31, 2013, 382 million tons were assigned to mines either in production, temporarily idle, or under development. The proved and probable reserves at December 31, 2013 include 2,511 million tons of steam coal reserves, of which approximately 5 percent has a sulfur content equivalent to less than 1.2 pounds sulfur dioxide per million British thermal unit (Btu), 18 percent has a sulfur content equivalent to between 1.2 and 2.5 pounds sulfur dioxide per million Btu and an additional 77 percent has a sulfur content equivalent to greater than 2.5 pounds sulfur dioxide per million Btu. The reserves also include 521 million tons of metallurgical coal in consolidated reserves, of which approximately 49 percent has a sulfur content equivalent to less than 1.2 pounds sulfur dioxide per million Btu and an additional 51 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.