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IMPAIRMENT (Details 2) (Parenthetical) - Individual assets or cash-generating units [member]
12 Months Ended
Dec. 31, 2017
$ / Ounce-oz
Impairment [Line Items]  
Description of Changes in Gold Price 100
Discount rate applied to cash flow projections 0.50%
Description of Changes in Exchange Rate 5.00%
Description of Changes in Operating Costs 5.00%
Description of Changes in In-Situ Ounces 5.00%