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Metal and Other Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Inventories
Concentrate and dore inventory	$ 107,960	$ 91,130
Supplies	76,730	79,540
Metal and other inventory	$ 184,690	$ 170,670

Gross amount 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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