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Metal and Other Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Inventories
Concentrate and dore inventory	$ 86,613	$ 73,590
Supplies	64,436	59,191
Metal and other inventory	$ 151,049	$ 132,781

Carrying amount as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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