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PROVISIONS - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
May 31, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 $ 6,646      
Total liabilities     513,526 513,526 $ 536,809    
Discount rate used for future cash payments   20.00%          
Tax moratorium, down payment amount   $ 3,431          
Tax moratorium, principal and interest paid     13,455        
Interest expense on tax liabilities     7,616        
Provision for decommissioning, restoration and rehabilitation costs     $ 58,330 $ 58,330 $ 63,909 $ 58,920  
Change in the discount rate       1.00%      
Increase (decrease) through change in discount rate, other provisions       $ 4,573      
Marigold mine              
Disclosure of other provisions [line items]              
Discount rate used for future cash payments     2.60% 2.60% 2.60%    
Length of settlement       21 years      
Puna Operations              
Disclosure of other provisions [line items]              
Discount rate used for future cash payments     9.90% 9.90% 9.90%    
Length of settlement       16 years      
Seabee Gold Operation              
Disclosure of other provisions [line items]              
Discount rate used for future cash payments     2.30% 2.30% 2.30%    
Length of settlement       12 years      
Gross carrying amount              
Disclosure of other provisions [line items]              
Change in estimate of close down and restoration provision       $ (9,128) $ (42)    
Provision for export duty | Amortized cost              
Disclosure of other provisions [line items]              
Total liabilities   $ (4,303) $ 67,130 $ 67,130      
Puna Operations Inc.              
Disclosure of other provisions [line items]              
Useful life of property, plant and equipment 8 years     8 years      
Provision for decommissioning, restoration and rehabilitation costs     $ (8,317) $ (8,317)      
Amount recorded against carrying value of plant       8,458      
Benefit recognized in income statement       $ 141