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Commitments and Contigencies (Details Textual) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 02, 2014 USD ($) | Sep. 30, 2015 USD ($) oz | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) oz | Oct. 14, 2009 m | Jan. 21, 2009
Business Acquisition [Line Items] |  |  |  |  |  |
Price per ounce under agreement |  | $ 412 |  | $ 412 |  |
Maximum Height for Temporary Restriction on Mining | m |  |  |  |  | 4,400 |
NSR royalty percentage |  |  | 3.40% |  |  |
NSR royalty maximum amount |  |  | $ 39,400,000 |  |  |
Percentage of labor force covered by collective bargaining agreements |  | 10.80% |  | 10.80% |  |
Purchased royalty |  |  |  |  |  | 50.00%
Royalty agreement minimum obligation for the period | oz |  | 400,000 |  |  |  |
Rochester [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Royalty expenses |  |  |  | $ 0 |  |
Gold price per ounce for maximum royalty range |  | $ 24.50 |  |  |  |
Maximum royalty payable |  | $ 250,000 |  | 250,000 |  |
Maximum royalty range for gold price per ounce |  | 5.00% |  |  |  |
Palmarejo gold production royalty [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Termination payment | $ 2,000,000 |  |  |  |  |
Production to be sold, percent | 50.00% |  |  |  |  |
Price per ounce under agreement | $ 800 |  |  |  |  |
Aggregate deposit to be received | $ 22,000,000 |  |  |  |  |
Deposits received under gold stream agreement |  | $ 4,000,000 |  | $ 14,000,000 |  |
Rochester Royalty Obligation [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Remaining ounces under royalty obligation | oz |  | 26,200,000 |  | 26,200,000 |  |

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