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Commitments and Contigencies (Details Textual) oz in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Mar. 31, 2017 oz | Oct. 02, 2014 USD ($) | Oct. 14, 2009 m
Business Acquisition [Line Items] |  |  |  |
Percentage of labor force covered by collective bargaining agreements |  | 10.00% |  |
NSR royalty percentage | 3.40% |  |  |
NSR royalty maximum amount | $ 39,400,000 |  |  |
Maximum Height for Temporary Restriction on Mining | m |  |  |  | 4,400
Palmarejo gold production royalty [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
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 |  | 15.9 |  |

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