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Other current and non-current non-financial assets (Details Textual)) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other non-financial assets [Line Items]    
Construction in progress $ 486,345 $ 375,316
Metallic exploration [Member]    
Disclosure of other non-financial assets [Line Items]    
Useful life measured as period of time, property, plant and equipment 10 years  
Expense arising from exploration for and evaluation of mineral resources $ 0 165
Mt Holland [Member]    
Disclosure of other non-financial assets [Line Items]    
Assets arising from exploration for and evaluation of mineral resources 50,127 30,475
Exploration and evaluation assets [member]    
Disclosure of other non-financial assets [Line Items]    
Construction in progress 14,265 12,841
Non-current assets [Member]    
Disclosure of other non-financial assets [Line Items]    
Assets arising from exploration for and evaluation of mineral resources 6,576 6,576
Non-current assets [Member] | Other Non Current Non Financial Assets One [Member]    
Disclosure of other non-financial assets [Line Items]    
Assets arising from exploration for and evaluation of mineral resources 7,011 8,645
Other non current financial assets [Member]    
Disclosure of other non-financial assets [Line Items]    
Assets arising from exploration for and evaluation of mineral resources 4,296 3,433
Current Inventories [Member]    
Disclosure of other non-financial assets [Line Items]    
Assets arising from exploration for and evaluation of mineral resources $ 1,318 $ 1,367