Commitment and Contigencies (Details Textual) (USD $)	3 Months Ended			3 Months Ended			3 Months Ended
	Mar. 31, 2013 oz Agreements	Dec. 31, 2012	Jan. 21, 2009	Mar. 31, 2013 Rochester [Member]	Mar. 31, 2012 Rochester [Member]	Jul. 07, 1995 Echo Bay [Member] oz	Mar. 31, 2013 Kensington [Member]	Jul. 07, 1995 Kensington [Member]	Jul. 07, 1995 Coeur Alaska Inc [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
Minimum royalty range for gold price per ounce							1.00%
Gold price per ounce for minimum royalty range							400
Maximum royalty range for gold price per ounce				5.00%			2.50%
Gold price per ounce for maximum royalty range				23.60			475
Royalty expenses				1,000,000	600,000
Additional Commitment and Contingencies (Textual) [Abstract]
Number of labor agreements in South America	1
Percentage of labor force covered by collective bargaining agreements	10.60%
Accrued obligations postemployment benefits	$ 7,700,000	$ 7,600,000
Royalty to be capped in terms of ounces of production	1,000,000
Purchased royalty			50.00%
Royalty agreement minimum obligation for the period	400,000
Royalty Agreement Minimum Obligation for Per Month	4,167
Royalty Agreement Period			8 years