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Commitments and Contigencies (Details Textual) (USD $) | 0 Months Ended | 3 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 3 Months Ended |  | 0 Months Ended | 1 Months Ended
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Jan. 21, 2009 | Jun. 30, 2014 oz | Jun. 30, 2013 | Oct. 14, 2009 m | Jun. 30, 2014 Rochester [Member] | Jun. 30, 2013 Rochester [Member] | Jun. 30, 2013 Rochester [Member] | Jul. 07, 1995 Echo Bay [Member] oz | Jun. 30, 2014 Kensington [Member] | Jul. 07, 1995 Kensington [Member] | Jul. 07, 1995 Coeur Alaska Inc [Member] | Jun. 05, 2012 Hazardous Waste On-Site [Member] Callahan Mining Corporation [Member] defendant | Feb. 28, 2010 Hazardous Waste On-Site [Member] Callahan Mining Corporation [Member]
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Expense |  |  | $ 32,000,000 |  |  |  |  |  |  |  |  |  |
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% |  |  |  |
Maximum royalty payable |  |  |  |  | 250,000 |  |  |  |  |  |  |  |
Gold price per ounce for maximum royalty range |  |  |  |  | 23.60 |  |  |  | 475 |  |  |  |
Royalty expenses |  |  |  |  | 0 | 0 | 1,000,000 |  |  |  |  |  |
Litigation Settlement, Amount |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  | 3,500,000
Number of defendants |  |  |  |  |  |  |  |  |  |  |  | 5 |
Maximum Height for Temporary Restriction on Mining |  |  |  | 4,400 |  |  |  |  |  |  |  |  |
NSR royalty percentage |  |  | 3.40% |  |  |  |  |  |  |  |  |  |
NSR royalty maximum amount |  |  | $ 39,400,000 |  |  |  |  |  |  |  |  |  |
Number of labor agreements in South America |  | 1 |  |  |  |  |  |  |  |  |  |  |
Percentage of labor force covered by collective bargaining agreements |  | 9.90% |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |

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