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Commitments and Contigencies (Details Textual) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) t milestone | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Oct. 02, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Palmarejo Gold Stream Agreement, Deferred Revenue Unamortized Balance | $ 11,600,000 | $ 11,600,000 |  |  |  |
Silvertip acquisition contingent consideration | 49,817,000 | $ 49,817,000 |  | $ 25,000,000 |  |
Palmarejo gold production royalty |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Production to be sold, percent |  |  |  |  |  | 50.00%
Price per ounce under agreement |  |  |  |  |  | $ 800
Aggregate deposit to be received |  |  |  |  |  | $ 22,000,000.0
JDS Silver Holdings Ltd. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Silvertip acquisition contingent consideration |  |  |  |  | $ 50,000,000.0 |
Long-term Purchase Commitment, Milestones | milestone |  | 2 |  |  |  |
JDS Silver Holdings Ltd. | First Milestone |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Silvertip acquisition contingent consideration |  |  |  |  | 25,000,000.0 |
Sustained minim and milling per day (in tones) | t |  | 1,000 |  |  |  |
JDS Silver Holdings Ltd. | Second Milestone |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Silvertip acquisition contingent consideration |  |  |  |  | 25,000,000.0 |
Maximum payment |  |  |  |  | $ 25,000,000.0 |
Tonnes of Resource Added | t |  | 3,700,000 |  |  |  |
Amount of resource required (in tonnes) | t |  | 300,000 |  |  |  |
Commitment amount per resource amount reached |  | $ 5,000,000.0 |  |  |  |
Minimum Resource Tonnes Milestone | t |  | 2,500,000 |  |  |  |
Silvertip [Member] | Permit Contingent Consideration |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration, liability | 25,000,000.0 | $ 25,000,000.0 |  |  |  |
Silvertip [Member] | Resource Contingent Consideration |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration, liability | 24,800,000 | 24,800,000 |  |  |  |
Kensington |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revenue liability | 10,600,000 | $ 10,600,000 | $ 25,000,000.0 |  |  |
Revenue recognized | $ 14,700,000 |  |  |  |  |

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