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PROVISIONS - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2007
Disclosure of other provisions [line items]            
Export duty, percentage           10.00%
Tax moratorium, settlement amount   $ 1,057,444        
Tax moratorium, settlement amount, undiscounted cash flows   $ 68,621        
Tax moratorium, down payment percentage   5.00%        
Tax moratorium, installment payment period   60 months        
Tax moratorium liability, interest rate   1.50%        
Export duties paid     $ 6,646      
Total liabilities     515,162 $ 513,526    
Provision for decommissioning, restoration and rehabilitation costs     $ 62,172 $ 58,330 $ 63,909  
Change in the discount rate     1.00%      
Increase (decrease) through change in discount rate, other provisions     $ 5,559      
Marigold mine            
Disclosure of other provisions [line items]            
Discount rate used for future cash payments     2.80% 2.60%    
Length of settlement     20 years      
Puna Operations            
Disclosure of other provisions [line items]            
Discount rate used for future cash payments     9.90% 9.90%    
Length of settlement     15 years      
Seabee Gold Operation            
Disclosure of other provisions [line items]            
Discount rate used for future cash payments     2.30% 2.30%    
Length of settlement     11 years      
Gross carrying amount            
Disclosure of other provisions [line items]            
Change in estimate of close down and restoration provision     $ 3,269 $ (9,128)    
Puna Operations Inc.            
Disclosure of other provisions [line items]            
Useful life of property, plant and equipment 8 years          
Provision for decommissioning, restoration and rehabilitation costs     (8,317)      
Amount recorded against carrying value of plant     8,458      
Benefit recognized in income statement     $ 141