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IMPAIRMENT AND REVERSAL OF NON-CURRENT ASSETS - Assumptions (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / pound
ozt
$ / ounce
Dec. 31, 2016
USD ($)
$ / pound
$ / ounce
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Impairment (reversals) charges $ (212,000) $ (250,000)
Gold    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / ounce 1,200 1,050
NAV multiple 0.012 0.012
LOM year 17 years 15 years
Gold | Average    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
WACC 6.00% 4.00%
Gold | Minimum    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | ozt 30  
WACC 3.00% 3.00%
Gold | Maximum    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | ozt 55  
WACC 11.00% 6.00%
Copper | Average    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
WACC 9.00% 9.00%
Silver | Minimum    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | ozt 0.41  
Silver | Maximum    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | ozt 0.76  
Long-term | Copper    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / pound 2.75 2.75
$100 Increase in Gold Price | Pueblo Viejo | Gold    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Impairment (reversals) charges $ 546  
$100 Decrease in Gold Price | Pueblo Viejo | Gold    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Impairment (reversals) charges (651)  
$100 Decrease in Gold Price | Lagunas Norte | Gold    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Impairment (reversals) charges (311)  
$100 Decrease in Gold Price | Veladero | Gold    
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]    
Impairment (reversals) charges $ (188)