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ACQUISITION OF MARIANA RESOURCES LIMITED (Narrative) (Details)
$ in Thousands
 6 Months Ended
Jul. 03, 2017
USD ($)
yr
shares
$ / item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Disclosure detailed information about asset acquisitions [line items]        
Shares issued for acquisition of Mariana Resources Ltd., shares | shares 32,685,228      
Additional cash paid for acquisition of asset $ 47,300      
Share ratio of entity equity instruments transferred to acquiree shareholders 0.3487      
Fair value of net assets acquired related to asset acquisition $ 199,600      
Investments in associates accounted for using equity method   $ 177,452    
Exploration and Evaluation Assets 5,000 $ 2,599    
Cash and other assets acquired 5,000      
Current accounts payable and accrued liabilities acquired $ 1,100      
Fair value assumption for annual risk free interest rate on warrants and options 1.00%      
Volatility rate assumption used in fair value of warrants and options 30.00%      
Expected life assumption used in fair value of warrants and options 1 year 7 months 6 days      
Hot Maden Associate [member]        
Disclosure detailed information about asset acquisitions [line items]        
Proportion of ownership interest in associate   30.00%    
Investments in associates accounted for using equity method $ 190,700 $ 177,452
Fair value assumption commodity price used | $ / item 1,300      
Fair value assumption discount rate used to value investment in associate 7.00%      
Hot Maden Associate [member] | Bottom of range [member]        
Disclosure detailed information about asset acquisitions [line items]        
Estimated useful life of mine assumption used to value investment in associate | yr 12      
Hot Maden Associate [member] | Top of range [member]        
Disclosure detailed information about asset acquisitions [line items]        
Estimated useful life of mine assumption used to value investment in associate | yr 14