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ACQUISITIONS AND CHANGE IN INTEREST ON MINERAL PROPERTIES - Narrative (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / $
$ / ounce
May 31, 2017
USD ($)
May 30, 2016
CAD ($)
Mar. 07, 2016
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2017
May 31, 2016
$ / shares
May 31, 2016
USD ($)
Disclosure of detailed information about business combination [line items]                  
Payments for interest in joint venture         $ 12,972,000 $ 0      
Property, plant and equipment $ 658,629,000       658,629,000 663,828,000      
Non-controlling interest 23,043,000       23,043,000 0      
Equity attributable to our shareholders         17,231,000        
Business acquisition costs         0 4,757,000      
Goodwill $ 49,786,000       $ 49,786,000 49,786,000      
Discount rate applied to cash flow projections             20.00%    
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) | $ / $ 0.8000                
Discount rate applied to cash flow projections 7.00%       7.00%        
Claude Resources Inc.                  
Disclosure of detailed information about business combination [line items]                  
Total purchase price                 $ 329,402,000
Ratio of shares transferred per common share                 0.185
Cash transferred per common share (in CAD per share) | $ / shares               $ 0.001  
Business acquisition costs           4,757,000      
Goodwill                 $ 49,786,000
Transaction share price     $ 11.35 $ 7.89          
Revenue of combined entity as if combination occurred at beginning of period           522,452,000      
Net income of combined entity as if combination occurred at beginning of period           64,644,000      
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     8 years        
Payments for interest in joint venture   $ 12,972,000              
Property, plant and equipment   28,839,000              
Non-controlling interest   18,573,000              
Other                  
Disclosure of detailed information about business combination [line items]                  
Equity attributable to our shareholders         $ (1,342,000) $ 0      
Other | Puna Operations Inc.                  
Disclosure of detailed information about business combination [line items]                  
Equity attributable to our shareholders   $ (1,342,000)