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SEGMENTED INFORMATION - Revenues From Mining Operations and Production Costs (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Operating segments    
Number of business units | item 3  
Revenues from Mining Operations $ 2,242,604 $ 2,138,232
Production Costs [1] (1,057,842) (1,031,892)
Exploration and Corporate Development (141,450) (146,978)
Gain on Impairment Reversal   120,161
Segment Income (Loss) 1,043,312 1,079,523
Corporate and other:    
Amortization of property, plant and mine development (508,739) (613,160)
General and administrative (115,064) (102,781)
Impairment loss on available-for- sale securities (8,532)  
Finance costs (78,931) (74,641)
Gain on derivative financial instruments 20,990 9,468
Gain on sale of available-for-sale securities 168 3,500
Environmental remediation (1,219) (4,058)
Foreign currency translation loss (gain) (13,313) (13,157)
Other (income) expenses 3,709 (16,233)
Income before income and mining taxes 342,381 268,461
Asset    
Total assets 7,865,601 7,107,951
LaRonde mine    
Asset    
Total assets 870,150 808,981
Lapa mine    
Asset    
Total assets 17,867 16,473
Goldex mine    
Asset    
Total assets 275,132 248,766
Meadowbank mine    
Asset    
Total assets 565,355 500,207
Canadian Malartic joint operation    
Asset    
Total assets 1,943,304 1,956,285
Meliadine project    
Asset    
Total assets 1,194,414 781,999
Kittila mine    
Asset    
Total assets 982,378 961,392
Pinos Altos mine    
Asset    
Total assets 668,492 667,123
Creston Mascota deposit at Pinos Altos    
Asset    
Total assets 50,144 60,308
La India mine    
Asset    
Total assets 427,957 428,005
Exploration    
Asset    
Total assets 277,099 198,738
Operating segment | Northern Business    
Operating segments    
Revenues from Mining Operations 1,790,952 1,638,359
Production Costs (856,493) (840,249)
Exploration and Corporate Development (32,735) (67,532)
Gain on Impairment Reversal   120,161
Segment Income (Loss) 901,724 850,739
Asset    
Total assets 5,848,600 5,274,103
Operating segment | LaRonde mine    
Operating segments    
Revenues from Mining Operations 484,488 388,180
Production Costs (185,488) (179,496)
Segment Income (Loss) 299,000 208,684
Operating segment | Lapa mine    
Operating segments    
Revenues from Mining Operations 64,572 92,160
Production Costs (38,786) (52,974)
Segment Income (Loss) 25,786 39,186
Operating segment | Goldex mine    
Operating segments    
Revenues from Mining Operations 139,665 149,730
Production Costs (71,015) (63,310)
Segment Income (Loss) 68,650 86,420
Operating segment | Meadowbank mine    
Operating segments    
Revenues from Mining Operations 449,025 384,023
Production Costs (224,364) (218,963)
Exploration and Corporate Development (28,871) (63,488)
Gain on Impairment Reversal   37,161
Segment Income (Loss) 195,790 138,733
Operating segment | Canadian Malartic joint operation    
Operating segments    
Revenues from Mining Operations 404,441 371,920
Production Costs (188,568) (183,635)
Exploration and Corporate Development (3,864) (4,044)
Segment Income (Loss) 212,009 184,241
Operating segment | Meliadine project    
Operating segments    
Gain on Impairment Reversal   83,000
Segment Income (Loss)   83,000
Operating segment | Kittila mine    
Operating segments    
Revenues from Mining Operations 248,761 252,346
Production Costs (148,272) (141,871)
Segment Income (Loss) 100,489 110,475
Operating segment | Southern Business    
Operating segments    
Revenues from Mining Operations 451,652 499,873
Production Costs (201,349) (191,643)
Segment Income (Loss) 250,303 308,230
Asset    
Total assets 1,146,593 1,155,436
Operating segment | Pinos Altos mine    
Operating segments    
Revenues from Mining Operations 257,905 294,377
Production Costs (108,726) (114,557)
Segment Income (Loss) 149,179 179,820
Operating segment | Creston Mascota deposit at Pinos Altos    
Operating segments    
Revenues from Mining Operations 63,798 62,967
Production Costs (31,490) (27,341)
Segment Income (Loss) 32,308 35,626
Operating segment | La India mine    
Operating segments    
Revenues from Mining Operations 129,949 142,529
Production Costs (61,133) (49,745)
Segment Income (Loss) 68,816 92,784
Operating segment | Exploration    
Operating segments    
Exploration and Corporate Development (108,715) (79,446)
Segment Income (Loss) (108,715) (79,446)
Corporate and others    
Asset    
Total assets $ 593,309 $ 479,674
[1] Exclusive of amortization, which is shown separately.