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Financial Expenses (Details) - USD ($)
 12 Months Ended 36 Months Ended 60 Months Ended 72 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2011
Disclosure Of Financial Expenses [Line Items]                    
Interest on mining royalties (a) $ 370,159,000 $ 144,815,000 $ 0              
Interest on senior unsecured credit facility (Note 11(a)) 49,551,000 44,678,000 51,155,000              
Other financial expenses (b) 6,492,000 10,934,000 1,880,000              
Interest on shareholder loans (Note 11(b)) 0 7,992,000 19,836,000              
Extinguishment debt - debt issuance cost 1,902,000 6,266,000 0              
Amortisation of debt issuance costs 2,419,000 4,479,000 8,901,000              
Capitalized Interest (3,790,000) (2,252,000) (1,334,000)              
Finance costs 38,456,000 34,623,000 $ 31,580,000              
Interest on royalty penalties for december two thousand six through two thousand eight 6.1 141,700,000                
Interest on Net Asset Tax   3,100,000                
Interest On Royalty Penalties For December Two Thousand Nine Through Two Thousand Thirteen                 $ 218,700,000  
Interest On SMTs For December Two Thousand Eleven Through Two Thousand Thirteen               $ 51,000    
Net asset tax relating to royalties   $ 33,600,000   $ 12,100,000 $ 12,100,000 $ 12,100,000 $ 12,100,000      
Deferred Interest On Royalty Installment Program For January Two Thousand Nine Through September Two Thousand Eleven $ 5,300,000                  
Interest On Tax Credit       $ 1,300,000            
Income Tax Related to Disputed Mining                   $ 75,700,000