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Commitments and Contractual Obligations - Narrative (Details) m in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 03, 2020 $ / oz | Mar. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Apr. 30, 2007 USD ($) $ / oz | Jun. 30, 2020 $ / oz m | Dec. 31, 2020 USD ($) T | Dec. 31, 2019 USD ($)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Proceeds from borrowings, classified as financing activities | $ |  |  |  |  |  |  | $ 150,000,000 | $ 494,000,000
Consideration paid | $ |  |  |  | $ (8,075,000) | $ 57,500,000 |  |  |
Silver price ($/oz) | $ / oz | 11.43 |  |  |  | 3.90 | 2.00 |  |
Expansion drilling (in meters) | m |  |  |  |  |  | 30 |  |
Revolving credit facility |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Proceeds from borrowings, classified as financing activities | $ |  | $ 150,000,000 | $ 150,000,000 |  |  |  | $ 150,000,000 |
Hellas Gold SA ("Hellas") | Zinc |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Number of dry metric tonnes |  |  |  |  |  |  | 28,000 |
Hellas Gold SA ("Hellas") | Lead And Silver Concentrates |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Number of dry metric tonnes |  |  |  |  |  |  | 4,500 |
Hellas Gold SA ("Hellas") | Gold Concentrate |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Number of dry metric tonnes |  |  |  |  |  |  | 150,000 |
Tuprag Metal Madencilik Sanayi Ve Ticaret AS | Gold Concentrate |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |
Number of dry metric tonnes |  |  |  |  |  |  | 58,500 |

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