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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) |

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