Reclamation and Mine Closure Costs (Details Textual) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Reclamation and Mine Closure Costs (Textual) [Abstract]
Accrued reclamation liabilities	$ 32.7	$ 27.3
Accrued remediation liabilities related to former mining operations	$ 1.0	$ 1.8

Accrued reclamation liabilities related to mining activities.

No definition available.

Name:	cde_AccruedReclamationLiabilitiesRelatedToMiningActivities
Namespace Prefix:	cde_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant