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OTHER ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
OTHER ASSETS    
Federal, provincial and other sales taxes receivable $ 83,593 $ 77,380
Prepaid expenses 53,503 47,416
Other 13,530 12,014
Total other current assets 150,626 136,810
Non-current ore in stockpiles and on leach pads 69,587 62,780
Other assets 10,318 11,383
Total other assets $ 79,905 $ 74,163