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IMPAIRMENT LOSS ON MEADOWBANK MINE (Details)
12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2011
Meadowbank mine
USD ($)
USDperounce
Dec. 31, 2011
Meadowbank mine
CAD
Property, Plant and Equipment [Line Items]        
Impairment loss on Meadowbank mine (note 18) $ 907,681,000      
Property, plant and mine development book value 3,895,355,000 4,564,563,000 1,700,000,000  
Old long-term gold prices (in dollars per ounce)     1,250 1,250
Long-term gold prices (in dollars per ounce)     1,553 1,553
Old foreign exchange rates (in dollars per share)     $ 0.92 1
Exchange rate under foreign exchange forward contract (in CAD per US dollar)     $ 0.97 1
Percentage of average gold recovery     92.90% 92.90%
Percentage of Interest rate used to calculated fair value by discounting the estimated future net cash flows (as a percent)     5.00% 5.00%