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Loans and Borrowings - Disclosure of Detailed Information About Borrowings Explanatory (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Apr. 11, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]        
Loans and borrowings $ 264,049   $ 214,559 $ 43,461
Less: Current portion of loans and borrowings (61,574)   (54,704)  
Non-current portion of loans and borrowings 202,475   159,855  
Revolving Credit Facility [member]        
Disclosure of detailed information about borrowings [line items]        
Loans and borrowings 116,625 $ 130,000 97,858  
Convertible Notes [member]        
Disclosure of detailed information about borrowings [line items]        
Loans and borrowings 125,850      
Sprott Facility [member]        
Disclosure of detailed information about borrowings [line items]        
Loans and borrowings     18,249  
Aurizona Construction Facility [Member]        
Disclosure of detailed information about borrowings [line items]        
Loans and borrowings     68,831  
Standby Loan [member]        
Disclosure of detailed information about borrowings [line items]        
Loans and borrowings 12,000   11,803  
Debenture [member]        
Disclosure of detailed information about borrowings [line items]        
Loans and borrowings $ 9,574   $ 17,818