Property, Plant and Equipment and Assets Held for Sale (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, plant and equipment
Property, plant and equipment, gross	$ 50,521	$ 293,165
Less: Accumulated depreciation and amortization	(18,146)	(12,260)
Property, plant and equipment, net	32,375	280,905
Mineral properties
Property, plant and equipment
Property, plant and equipment, gross	22,397	239,200
Exploration properties
Property, plant and equipment
Property, plant and equipment, gross	2,993	15,685
Royalty properties
Property, plant and equipment
Property, plant and equipment, gross	200	200
Buildings
Property, plant and equipment
Property, plant and equipment, gross	2,349	4,808
Mining equipment and machinery
Property, plant and equipment
Property, plant and equipment, gross	19,441	29,185
Other furniture and equipment
Property, plant and equipment
Property, plant and equipment, gross	1,054	2,204
Asset retirement cost
Property, plant and equipment
Property, plant and equipment, gross	$ 2,087	$ 1,883

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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