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Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Detail) - Major Components of Property, Plants, Equipment and Mineral Interests (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Cost	$ 1,433,195	$ 1,313,414
Less accumulated depreciation, depletion and amortization	436,536	390,202
Net carrying value	996,659	923,212
Mining Properties, Including Asset Retirement Obligations [Member]
Cost	294,573	286,873
Mine Development [Member]
Cost	151,504	123,772
Plants And Equipment [Member]
Cost	419,377	383,045
Land [Member]
Cost	15,788	11,188
Mineral Interests [Member]
Cost	375,028	383,491
Construction in Progress [Member]
Cost	$ 176,925	$ 125,045

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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- Definition

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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