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Contingencies (Details) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 lawsuit | Dec. 31, 2020 USD ($) lawsuit | Dec. 31, 2019 USD ($) | Nov. 30, 2018 USD ($)
Disclosure of contingent liabilities [line items] |  |  |  |
Provision for decommissioning, restoration and rehabilitation costs |  | $ 235,100 | $ 188,500 |
Royalty expense |  | $ 27,494 | 26,721 |
San Vicente mine [member] | COMIBOL [Member] | Bolivia |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Participation fee |  | 37.50% |  |
Royalty expense |  | $ 5,800 | $ 5,100 |
Tahoe Resources, Inc [member] |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Number of purported class action lawsuits filed | lawsuit | 3 |  |  |
Number of class action suits after consolidation | lawsuit |  | 1 |  |
Republic Metals Corporation [Member] |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Amount of metal in possession at time of bankruptcy |  |  |  | $ 4,900

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