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Other Financial Liabilities (debt) - Lease liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2017
Disclosure Of Other Financial Liabilities debt [Line Items]    
Interest expense on lease liabilities, see Note 18 $ 5,242 $ 0
Balance at end of the year 7,503  
Depreciation charge of right-of-use assets, see Note 15 11,488  
Expense relating to variable lease payments, low-value and short-term leases, see Note 15 7,069  
Amounts recognized in profit or los 23,799  
Sociedad Minera El Brocal S.A.A. [Member]    
Disclosure Of Other Financial Liabilities debt [Line Items]    
Balance at beginning of the year 95,728  
Additions 550  
Interest expense on lease liabilities, see Note 18 5,242  
Payments (10,479)  
Balance at end of the year $ 85,799