Additional commitment and contingencies.

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Commitment and contingencies.

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Maximum gold prices royalty range per ounce.

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Maximum percentage of royalty.

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Maximum percentage of royalty based on gold price per ounce.

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Minimum gold prices royalty range per ounce.

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Minimum market price to calculate royalty interest.

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Minimum percentage of royalty based on gold price per ounce.

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Number of labor agreements.

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Percentage of labor force covered by collective bargaining agreements.

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Royalty expenses.

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Royalty to be capped in terms of ounces of production.

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Volume related to net smelter return royalty of future gold production.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

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Percentage of voting equity interests acquired in the business combination.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

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-Section 50

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Commitment and Contigencies (Details Textual) (USD $)	9 Months Ended				9 Months Ended	3 Months Ended		9 Months Ended
Commitment and Contigencies (Details Textual) (USD $)	Sep. 30, 2011 Year Claim mi oz LegalMatter	Jul. 07, 1995 Echo Bay [Member] oz	Jul. 07, 1995 Kensington [Member]	Jul. 07, 1995 Coeur Alaska Inc [Member]	Sep. 30, 2011 Kensington Production Royalty [Member]	Sep. 30, 2011 Rochester production royalty [Member]	Sep. 30, 2010 Rochester production royalty [Member]	Sep. 30, 2011 Rochester production royalty [Member]	Sep. 30, 2010 Rochester production royalty [Member]
Commitment and Contingencies (Textual) [Abstract]
Acquisition of ownership interest		50.00%	100.00%
Volume related to net smelter return royalty of future gold production		1,000,000
Purchase price and construction and development expenses				$ 32,500,000
Royalty expenses						800,000	0	1,700,000	0
Minimum percentage of royalty based on gold price per ounce					1.00%
Maximum percentage of royalty								5.00%
Maximum Percentage of royalty based on gold price per ounce					2.50%
Minimum gold prices royalty range per ounce					400
Maximum gold prices royalty range per ounce					475
Minimum market price to calculate royalty interest								$ 22.87
Additional Commitment and Contingencies (Textual) [Abstract]
Number of labor agreements in South America	2
Percentage of labor force covered by collective bargaining agreements	15.00%
Royalty to be capped in terms of ounces of production	1,000,000