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Commitments and Contigencies (Details Textual) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 02, 2014 USD ($) | Dec. 31, 2016 USD ($) oz | Sep. 30, 2016 oz | Oct. 14, 2009 m | Jan. 21, 2009
Business Acquisition [Line Items] |  |  |  |  |
Percentage of labor force covered by collective bargaining agreements |  |  | 11.00% |  |
NSR royalty percentage |  | 3.40% |  |  |
NSR royalty maximum amount |  | $ 39,400,000 |  |  |
Purchased royalty |  |  |  |  | 50.00%
Royalty agreement minimum obligation for the period | oz |  | 400,000 |  |  |
Price per ounce under agreement |  | $ 416 |  |  |
Maximum Height for Temporary Restriction on Mining | m |  |  |  | 4,400 |
Palmarejo gold production royalty [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payment made for gold on the end of royalty obligation | oz |  | 4,167 | 4,167 |  |
Production to be sold, percent |  |  |  |  | 50.00%
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 |  |  |  |
Rochester Royalty Obligation [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payable ounces under royalty obligation | oz |  |  | 18,000,000 |  |

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