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Commitments - Narrative (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]  
Capital expenditure commitments $ 21,085
2019  
Disclosure of detailed information about property, plant and equipment [line items]  
Capital expenditure commitments 21,085
2019 | Capital Spares | Fekola  
Disclosure of detailed information about property, plant and equipment [line items]  
Capital expenditure commitments 7,000
2019 | Mobile Equipment | Fekola  
Disclosure of detailed information about property, plant and equipment [line items]  
Capital expenditure commitments 4,000
2019 | Oxygen Plant | Fekola  
Disclosure of detailed information about property, plant and equipment [line items]  
Capital expenditure commitments 1,000
2019 | Plant Expansion | Masbate  
Disclosure of detailed information about property, plant and equipment [line items]  
Capital expenditure commitments 2,000
2019 | Tailings Storage Facility | Libertad  
Disclosure of detailed information about property, plant and equipment [line items]  
Capital expenditure commitments $ 7,000