Litigation and Other Events	3 Months Ended
Mar. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
LITIGATION AND OTHER EVENTS	LITIGATION AND OTHER EVENTS Sites Related to Callahan Mining Corporation In 1991, the Company acquired all of the outstanding common stock of Callahan Mining Corporation. Since then, the Company has received requests for information or notices of potential liability from state or federal agencies with regard to Callahan's operations at sites in Idaho, Maine, Colorado and Washington. The Company did not make any decisions with respect to generation, transport or disposal of hazardous waste at these sites. Therefore, the Company believes that it is not liable for any potential cleanup costs either directly as an operator or indirectly as a parent. To date, none of these agencies have made any claims against the Company or Callahan for cleanup costs. The Company anticipates that further agency interaction may be possible with respect to two of these sites. Callahan operated a mine and mill in Brooksville, Maine from 1968 until 1972 and subsequently disposed of the property. In 2000, the U.S. Environmental Protection Agency, or EPA, made a formal request to the Company for information regarding the site. The site was placed on the National Priorities List on September 5, 2002, and the Maine Department of Transportation, a partial owner of the property, signed a consent order in 2005. In January 2009, the EPA and the State of Maine made additional formal requests to the Company for information relating to the site, to which the Company responded. The first phase of cleanup at the site began in April 2011. The Van Stone Mine in Stevens County, Washington consists of several parcels and was mined from 1926 until 1993. Callahan sold its parcel in 1990. In February 2010, the State of Washington Department of Ecology notified Callahan Mining Corporation that it, among others, is a potentially liable person (PLP) under Washington law. American Smelting and Refining Company, which developed the mill on the site in 1951, settled for $3.5 million. Another potentially liable person, Vaagen Brothers, signed a consent order which allows access to the site for a Remedial Investigation and Feasibility Study. The Company has no further information on the investigation and has not received any further notices. Bolivian Temporary Restriction on Mining above 4,400 Meters On October 14, 2009, the Bolivian state-owned mining organization, COMIBOL, announced by resolution that it was temporarily suspending mining activities above the elevation of 4,400 meters above sea level while stability studies of Cerro Rico mountain are undertaken. The Company holds rights to mine above this elevation under valid contracts backed by Supreme Decree with COMIBOL as well as contracts with local mining cooperatives that hold their rights through COMIBOL. The Company adjusted its San Bartolomé mine plan to confine mining activities to the ore deposits below 4,400 meters above sea level and timely notified COMIBOL of the need to lift the restriction. In March 2010, the San Bartolomé mine began mining operations above the 4,400 meter level in high grade material located in the Huacajchi deposit, which was confirmed to be excluded from the October 2009 resolution, under an agreement with the cooperatives. In December 2011, a further area in the deposit, known as Huacajchi Sur was further confirmed to be open for mining as well. Other mining areas above the 4,400 meter level continue to be suspended. The mine plan adjustment may reduce production until the Company is able to resume mining above 4,400 meters. The Company believes this is a temporary suspension, although it is uncertain at this time how long the suspension will remain in place. If the restriction is not lifted, the Company may need to write down the carrying value of the asset. Unpatented Mining Claims Dispute at Rochester in Nevada On December 5, 2011, Coeur Rochester filed a lawsuit in the Sixth Judicial District Court of Nevada against Rye Patch Gold Corp and Rye Patch Gold US, Inc. seeking a declaratory judgment as to Coeur Rochester's ownership of 447 unpatented mining claims covering approximately 8,600 acres of federal lands in and surrounding the Coeur Rochester mine operation. On December 5, 2011, Rye Patch Gold US, Inc. filed a similar action asserting its interest in the claims in the Second Judicial District Court of Nevada. The Rye Patch action was subsequently moved to the Sixth Judicial Court and consolidated with Coeur Rochester's pending action. The dispute stems from competing asserted interests in the mining claims between Coeur Rochester and Rye Patch following Coeur Rochester's inadvertent failure to pay annual mining claim maintenance fees. On December 5, 2011, the court issued a temporary restraining order prohibiting Rye Patch from entering the property. On December 20, 2011, following a hearing, the District Court judge issued a preliminary injunction, enjoining Rye Patch from entering certain active mine areas at the Coeur Rochester mine operation. On March 6, 2012 Rye Patch filed a Motion for Preliminary Injunction to which Coeur Rochester responded in opposition on March 21, 2012. It is Coeur Rochester's position that there is no new material for review by the Court since the original preliminary injunction was granted in favor of Coeur Rochester. However, if granted in favor of Rye Patch, a preliminary injunction could halt Coeur Rochester's mining operations on the disputed claims. A hearing on the pending Motion is scheduled for May 10, 2012. The Company believes it holds a superior property interest to Rye Patch based on flaws in the Rye Patch claims, and the Company's prior valid possessory rights in the claims. The mine operates under an approved BLM plan of operations and has continued normal operations while the legal action is pending. We cannot predict how the court will rule on the ownership interest in the claims and if all or some of the claims at issue will be retained by the Company. The Company believes there would be no impact to the current silver and gold reserves at Coeur Rochester assuming an adverse outcome. However, the Company does believe an adverse outcome would cause it to modify existing plans to further expand future mining operations and would require permits to be updated to reflect changes in claim ownership arising from an adverse outcome. The Rochester property is also the subject of an administrative appeal filed by Great Basin Resource Watch (“GBRW”) with the Interior Board of Land Appeals (“IBLA”). This appeal challenges the decision of the U.S. Bureau of Land Management (“BLM”) to approve a plan of operations amendment permitting resumed mining in the existing mine pit and construction of a new heap leach pad. GBRW asserts that the National Environmental Policy Act (“NEPA”) required an Environmental Impact Statement for the plan of operations amendment, as opposed to the Environmental Assessment (“EA”) that was prepared. GBRW further alleges that BLM violated the Federal Land Policy & Management Act (“FLPMA”) by failing to avoid unnecessary and undue degradation of public lands. Because GBRW did not seek a stay of BLM's decision, operations are proceeding as approved. Coeur was granted intervenor status in the appeal and is actively participating in its resolution. The BLM and Coeur assert that the EA complies with NEPA and that BLM complied with FLPMA by, among other things, requiring mitigation of any possible future effects on water quality. BLM filed a Supplemental Briefing on March 1, 2012 regarding additional analysis conducted by the BLM further supporting and strengthening BLM and Coeur's positions that the EA complies with NEPA. We cannot predict whether this will result in further briefing with the IBLA, when the IBLA will rule on the appeal or what impact, if any, an adverse ruling may have on Rochester's operations.

LITIGATION AND OTHER EVENTS

Sites Related to Callahan Mining Corporation

In 1991, the Company acquired all of the outstanding common stock of Callahan Mining Corporation. Since then, the Company has received requests for information or notices of potential liability from state or federal agencies with regard to Callahan's operations at sites in Idaho, Maine, Colorado and Washington. The Company did not make any decisions with respect to generation, transport or disposal of hazardous waste at these sites. Therefore, the Company believes that it is not liable for any potential cleanup costs either directly as an operator or indirectly as a parent. To date, none of these agencies have made any claims against the Company or Callahan for cleanup costs. The Company anticipates that further agency interaction may be possible with respect to two of these sites.

Callahan operated a mine and mill in Brooksville, Maine from 1968 until 1972 and subsequently disposed of the property. In 2000, the U.S. Environmental Protection Agency, or EPA, made a formal request to the Company for information regarding the site. The site was placed on the National Priorities List on September 5, 2002, and the Maine Department of Transportation, a partial owner of the property, signed a consent order in 2005. In January 2009, the EPA and the State of Maine made additional formal requests to the Company for information relating to the site, to which the Company responded. The first phase of cleanup at the site began in April 2011.

The Van Stone Mine in Stevens County, Washington consists of several parcels and was mined from 1926 until 1993. Callahan sold its parcel in 1990. In February 2010, the State of Washington Department of Ecology notified Callahan Mining Corporation that it, among others, is a potentially liable person (PLP) under Washington law. American Smelting and Refining Company, which developed the mill on the site in 1951, settled for $3.5 million. Another potentially liable person, Vaagen Brothers, signed a consent order which allows access to the site for a Remedial Investigation and Feasibility Study. The Company has no further information on the investigation and has not received any further notices.

Bolivian Temporary Restriction on Mining above 4,400 Meters

On October 14, 2009, the Bolivian state-owned mining organization, COMIBOL, announced by resolution that it was temporarily suspending mining activities above the elevation of 4,400 meters above sea level while stability studies of Cerro Rico mountain are undertaken. The Company holds rights to mine above this elevation under valid contracts backed by Supreme Decree with COMIBOL as well as contracts with local mining cooperatives that hold their rights through COMIBOL. The Company adjusted its San Bartolomé mine plan to confine mining activities to the ore deposits below 4,400 meters above sea level and timely notified COMIBOL of the need to lift the restriction.

In March 2010, the San Bartolomé mine began mining operations above the 4,400 meter level in high grade material located in the Huacajchi deposit, which was confirmed to be excluded from the October 2009 resolution, under an agreement with the cooperatives. In December 2011, a further area in the deposit, known as Huacajchi Sur was further confirmed to be open for mining as well. Other mining areas above the 4,400 meter level continue to be suspended. The mine plan adjustment may reduce production until the Company is able to resume mining above 4,400 meters. The Company believes this is a temporary suspension, although it is uncertain at this time how long the suspension will remain in place. If the restriction is not lifted, the Company may need to write down the carrying value of the asset.

Unpatented Mining Claims Dispute at Rochester in Nevada

On December 5, 2011, Coeur Rochester filed a lawsuit in the Sixth Judicial District Court of Nevada against Rye Patch Gold Corp and Rye Patch Gold US, Inc. seeking a declaratory judgment as to Coeur Rochester's ownership of 447 unpatented mining claims covering approximately 8,600 acres of federal lands in and surrounding the Coeur Rochester mine operation. On December 5, 2011, Rye Patch Gold US, Inc. filed a similar action asserting its interest in the claims in the Second Judicial District Court of Nevada. The Rye Patch action was subsequently moved to the Sixth Judicial Court and consolidated with Coeur Rochester's pending action. The dispute stems from competing asserted interests in the mining claims between Coeur Rochester and Rye Patch following Coeur Rochester's inadvertent failure to pay annual mining claim maintenance fees. On December 5, 2011, the court issued a temporary restraining order prohibiting Rye Patch from entering the property. On December 20, 2011, following a hearing, the District Court judge issued a preliminary injunction, enjoining Rye Patch from entering certain active mine areas at the Coeur Rochester mine operation. On March 6, 2012 Rye Patch filed a Motion for Preliminary Injunction to which Coeur Rochester responded in opposition on March 21, 2012. It is Coeur Rochester's position that there is no new material for review by the Court since the original preliminary injunction was granted in favor of Coeur Rochester. However, if granted in favor of Rye Patch, a preliminary injunction could halt Coeur Rochester's mining operations on the disputed claims. A hearing on the pending Motion is scheduled for May 10, 2012. The Company believes it holds a superior property interest to Rye Patch based on flaws in the Rye Patch claims, and the Company's prior valid possessory rights in the claims. The mine operates under an approved BLM plan of operations and has continued normal operations while the legal action is pending. We cannot predict how the court will rule on the ownership interest in the claims and if all or some of the claims at issue will be retained by the Company. The Company believes there would be no impact to the current silver and gold reserves at Coeur Rochester assuming an adverse outcome. However, the Company does believe an adverse outcome would cause it to modify existing plans to further expand future mining operations and would require permits to be updated to reflect changes in claim ownership arising from an adverse outcome.

The Rochester property is also the subject of an administrative appeal filed by Great Basin Resource Watch (“GBRW”) with the Interior Board of Land Appeals (“IBLA”). This appeal challenges the decision of the U.S. Bureau of Land Management (“BLM”) to approve a plan of operations amendment permitting resumed mining in the existing mine pit and construction of a new heap leach pad. GBRW asserts that the National Environmental Policy Act (“NEPA”) required an Environmental Impact Statement for the plan of operations amendment, as opposed to the Environmental Assessment (“EA”) that was prepared. GBRW further alleges that BLM violated the Federal Land Policy & Management Act (“FLPMA”) by failing to avoid unnecessary and undue degradation of public lands. Because GBRW did not seek a stay of BLM's decision, operations are proceeding as approved. Coeur was granted intervenor status in the appeal and is actively participating in its resolution. The BLM and Coeur assert that the EA complies with NEPA and that BLM complied with FLPMA by, among other things, requiring mitigation of any possible future effects on water quality. BLM filed a Supplemental Briefing on March 1, 2012 regarding additional analysis conducted by the BLM further supporting and strengthening BLM and Coeur's positions that the EA complies with NEPA. We cannot predict whether this will result in further briefing with the IBLA, when the IBLA will rule on the appeal or what impact, if any, an adverse ruling may have on Rochester's operations.