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Mine standby costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of other income & finance costs [Line Items] |  |
Mine standby costs | $ 15,675 | $ 17,334
Lamaque |  |
Disclosure of other income & finance costs [Line Items] |  |
Mine standby costs | 3,086 | 0
Skouries |  |
Disclosure of other income & finance costs [Line Items] |  |
Mine standby costs | 8,890 | 7,911
Vila Nova |  |
Disclosure of other income & finance costs [Line Items] |  |
Mine standby costs | 746 | 2,115
Other Mine Location |  |
Disclosure of other income & finance costs [Line Items] |  |
Mine standby costs | $ 2,953 | $ 7,308

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