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ACQUISITIONS AND CHANGE IN INTEREST ON MINERAL PROPERTIES (Details)
$ in Thousands
 12 Months Ended
May 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
$ / $
$ / ounce
Dec. 31, 2017
USD ($)
May 31, 2016
USD ($)
Disclosure of detailed information about business combination [line items]        
Payments for interest in joint venture   $ 0 $ 12,972  
Property, plant and equipment   701,175 658,629  
Non-controlling interest   31,829 23,043  
Equity attributable to our shareholders     17,231  
Goodwill   $ 49,786 49,786  
Seabee Gold Operation        
Disclosure of detailed information about business combination [line items]        
Commodity price applied to cash flow projections (in USD per ounce) | $ / ounce   1,300    
Foreign exchange rate applied to cash flow projections (in CAD per USD) | $ / $   1.25    
Discount rate applied to cash flow projections   7.00%    
Claude Resources Inc.        
Disclosure of detailed information about business combination [line items]        
Goodwill       $ 49,786
Puna Operations Inc.        
Disclosure of detailed information about business combination [line items]        
Proportion of ownership interest in joint venture 75.00%      
Useful life of property, plant and equipment 8 years      
Payments for interest in joint venture $ 12,972      
Property, plant and equipment 28,839      
Non-controlling interest 18,573      
Other        
Disclosure of detailed information about business combination [line items]        
Equity attributable to our shareholders   $ 0 $ (1,342)  
Other | Puna Operations Inc.        
Disclosure of detailed information about business combination [line items]        
Equity attributable to our shareholders $ 1,342