Mineral Interests and Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Mineral Interests and Property, Plant and Equipment

Schedule of property, plant and equipment

	December 31,

	2011			2010
Land	$	85,439		$	68,695
Land improvements		14,484			12,356
Buildings and leasehold improvements		564,088			25,091
Mine development costs		36,861			84,930
Machinery and equipment		995,753			614,262
Gas properties and related development		222,711			305,697
Construction in progress		332,474			94,798

Total		2,251,810			1,205,829
Less: Accumulated depreciation and depletion		(614,628	)		(433,133	)

Net	$	1,637,182		$	772,696

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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