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Investments in associates and joint venture - Statement of fair values of the identifiable assets and liabilities of Tinka (Details)
$ in Thousands, £ in Millions
 12 Months Ended
Jan. 31, 2020
GBP (£)
Jan. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]          
Consideration transferred     $ 13,453 $ 0 $ 0
Tinka Resources Ltd [Member]          
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]          
Current assets     16,548    
Non-current assets     53,769    
Current liabilities     (612)    
Total identifiable net assets at fair value     69,705    
Consideration transferred £ 16 $ 13,400 $ 13,453