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Financial instruments - Schedule of Liquidity Risk (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Accounts payable and accrued liabilities | $ 80,318 | $ 95,092
Derivative liabilities | 1,837 |
Principal | 479,535 | 702,181
Debt repayments | 688,369 |
Operating lease commitments | 8,422 |
Capital expenditure commitments | 21,085 |
Mine restoration provision | 21,138 |
Employee future benefits | 5,025 |
Other liabilities | 1,066 |
2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Accounts payable and accrued liabilities | 80,318 |
Derivative liabilities | 360 |
Debt repayments | 160,280 |
Operating lease commitments | 3,072 |
Capital expenditure commitments | 21,085 |
Mine restoration provision | 3,170 |
Employee future benefits | 1,184 |
Other liabilities | 302 |
2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Accounts payable and accrued liabilities | 0 |
Derivative liabilities | 1,477 |
Debt repayments | 56,858 |
Operating lease commitments | 1,994 |
Capital expenditure commitments | 0 |
Mine restoration provision | 2,268 |
Employee future benefits | 3,097 |
Other liabilities | 302 |
2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Accounts payable and accrued liabilities | 0 |
Derivative liabilities | 0 |
Debt repayments | 440,470 |
Operating lease commitments | 1,629 |
Capital expenditure commitments | 0 |
Mine restoration provision | 3,711 |
Employee future benefits | 248 |
Other liabilities | 302 |
2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Accounts payable and accrued liabilities | 0 |
Derivative liabilities | 0 |
Debt repayments | 21,790 |
Operating lease commitments | 1,046 |
Capital expenditure commitments | 0 |
Mine restoration provision | 6,321 |
Employee future benefits | 248 |
Other liabilities | 160 |
2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Accounts payable and accrued liabilities | 0 |
Derivative liabilities | 0 |
Debt repayments | 8,971 |
Operating lease commitments | 681 |
Capital expenditure commitments | 0 |
Mine restoration provision | 5,668 |
Employee future benefits | 248 |
Other liabilities | 0 |
Revolving credit facility: |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 395,822 | 344,149
Interest (estimated) | 54,749 |
Revolving credit facility: | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 21,731 |
Revolving credit facility: | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 21,731 |
Revolving credit facility: | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 11,287 |
Revolving credit facility: | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 0 |
Revolving credit facility: | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 0 |
Fekola Equipment Loan Facility |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 57,242 | 50,569
Interest (estimated) | 6,278 |
Fekola Equipment Loan Facility | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 2,764 |
Fekola Equipment Loan Facility | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 1,946 |
Fekola Equipment Loan Facility | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 1,119 |
Fekola Equipment Loan Facility | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 377 |
Fekola Equipment Loan Facility | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 72 |
Otjikoto Equipment Loan Facility |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 10,816 | 20,750
Interest (estimated) | 758 |
Otjikoto Equipment Loan Facility | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 428 |
Otjikoto Equipment Loan Facility | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 234 |
Otjikoto Equipment Loan Facility | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 84 |
Otjikoto Equipment Loan Facility | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 12 |
Otjikoto Equipment Loan Facility | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 0 |
Masbate Equipment Loan Facility |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 13,071 | 7,719
Interest (estimated) | 1,871 |
Masbate Equipment Loan Facility | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 787 |
Masbate Equipment Loan Facility | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 570 |
Masbate Equipment Loan Facility | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 363 |
Masbate Equipment Loan Facility | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 142 |
Masbate Equipment Loan Facility | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 9 |
Finance lease obligations |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 2,186 | 0
Interest (estimated) | 147 |
Finance lease obligations | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 62 |
Finance lease obligations | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 45 |
Finance lease obligations | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 28 |
Finance lease obligations | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 12 |
Finance lease obligations | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 0 |
Nicaraguan equipment loans |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 398 | 1,344
Interest (estimated) | 9 |
Nicaraguan equipment loans | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 9 |
Nicaraguan equipment loans | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 0 |
Nicaraguan equipment loans | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 0 |
Nicaraguan equipment loans | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 0 |
Nicaraguan equipment loans | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Interest (estimated) | 0 |
Principal | Revolving credit facility: |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 400,000 | $ 350,000
Principal | Revolving credit facility: | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 0 |
Principal | Revolving credit facility: | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 0 |
Principal | Revolving credit facility: | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 400,000 |
Principal | Revolving credit facility: | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 0 |
Principal | Revolving credit facility: | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 0 |
Principal | Fekola Equipment Loan Facility |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 58,634 |
Principal | Fekola Equipment Loan Facility | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 15,869 |
Principal | Fekola Equipment Loan Facility | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 15,869 |
Principal | Fekola Equipment Loan Facility | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 15,869 |
Principal | Fekola Equipment Loan Facility | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 9,397 |
Principal | Fekola Equipment Loan Facility | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 1,630 |
Principal | Otjikoto Equipment Loan Facility |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 10,922 |
Principal | Otjikoto Equipment Loan Facility | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 4,869 |
Principal | Otjikoto Equipment Loan Facility | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 3,453 |
Principal | Otjikoto Equipment Loan Facility | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 1,958 |
Principal | Otjikoto Equipment Loan Facility | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 642 |
Principal | Otjikoto Equipment Loan Facility | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 0 |
Principal | Masbate Equipment Loan Facility |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 13,526 |
Principal | Masbate Equipment Loan Facility | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 3,347 |
Principal | Masbate Equipment Loan Facility | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 3,347 |
Principal | Masbate Equipment Loan Facility | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 3,347 |
Principal | Masbate Equipment Loan Facility | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 2,908 |
Principal | Masbate Equipment Loan Facility | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 577 |
Principal | Finance lease obligations |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 2,186 |
Principal | Finance lease obligations | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 525 |
Principal | Finance lease obligations | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 525 |
Principal | Finance lease obligations | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 525 |
Principal | Finance lease obligations | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 525 |
Principal | Finance lease obligations | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 86 |
Principal | Nicaraguan equipment loans |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 398 |
Principal | Nicaraguan equipment loans | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 398 |
Principal | Nicaraguan equipment loans | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 0 |
Principal | Nicaraguan equipment loans | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 0 |
Principal | Nicaraguan equipment loans | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 0 |
Principal | Nicaraguan equipment loans | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Principal | 0 |
Accounts Payable, Derivative Liabilities, Borrowings, and Interest on Borrowings |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Debt repayments | 631,633 |
Accounts Payable, Derivative Liabilities, Borrowings, and Interest on Borrowings | 2019 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Debt repayments | 131,467 |
Accounts Payable, Derivative Liabilities, Borrowings, and Interest on Borrowings | 2020 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Debt repayments | 49,197 |
Accounts Payable, Derivative Liabilities, Borrowings, and Interest on Borrowings | 2021 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Debt repayments | 434,580 |
Accounts Payable, Derivative Liabilities, Borrowings, and Interest on Borrowings | 2022 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Debt repayments | 14,015 |
Accounts Payable, Derivative Liabilities, Borrowings, and Interest on Borrowings | 2023 |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Debt repayments | $ 2,374 |

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