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Supplementary cash flow information - Non-cash investing and financing activities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Statement Of Cash Flows [Line Items] |  |
Interest on loan to non-controlling interest | $ 203 |
Share-based payments, capitalized to mineral property interests | 2,507 | $ 3,622
Change in current liabilities relating to mineral property expenditures | (14,277) | (6,759)
Foreign exchange gains (losses) | 4,065 | (1,012)
Interest expense, capitalized to mineral property interests | 0 | 20,052
Shares issued for purchase of non-controlling interest | 0 | (2,000)
Fekola Equipment Loan Facility |  |
Statement Of Cash Flows [Line Items] |  |
Foreign exchange gains (losses) | 3,312 | (4,776)
Fekola SA |  |
Statement Of Cash Flows [Line Items] |  |
Non-controlling interest sold in exchange for loan receivable (Note 8) | 47,000 | 0
Kronk |  |
Statement Of Cash Flows [Line Items] |  |
Restricted cash and cash equivalents | 1,000 |
Deficit |  |
Statement Of Cash Flows [Line Items] |  |
Interest on loan to non-controlling interest | $ 1,352 | $ 0

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