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MINERAL, ROYALTY AND OTHER INTERESTS (Carrying Amount related to Mineral, Royalty and Other Interests) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost $ 613,329 $ 593,429
Net Additions (disposals) 1,403 19,900
Ending Cost 614,732 613,329
Opening Accumulated Depletion 210,544 179,066
Depletion 29,580 27,654
Depletion in Ending Inventory 1,344 1,317
Impairment of mineral, royalty and other interests 9,104 2,507
Ending Accumulated Depletion 249,255 210,544
Carrying Amount 365,477 402,785
Other Royalties [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 222,097 200,906
Net Additions (disposals) 2,596 21,191
Ending Cost 224,693 222,097
Opening Accumulated Depletion 115,492 106,393
Impairment of mineral, royalty and other interests 9,104 2,507
Ending Accumulated Depletion 130,492 115,492
Carrying Amount 94,201 106,605
Other [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 10,725 11,339
Net Additions (disposals) (1,264) (614)
Ending Cost 9,461 10,725
Opening Accumulated Depletion 4,540 4,471
Depletion in Ending Inventory 27  
Ending Accumulated Depletion 4,670 4,540
Carrying Amount 4,791 6,185
CANADA | Bachelor Lake [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 23,972 22,671
Net Additions (disposals) 37 1,301
Ending Cost 24,009 23,972
Opening Accumulated Depletion 19,339 14,678
Depletion in Ending Inventory 21 250
Ending Accumulated Depletion 23,183 19,339
Carrying Amount 826 4,633
CANADA | Black Fox [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 37,761 37,758
Net Additions (disposals) 30 3
Ending Cost 37,791 37,761
Opening Accumulated Depletion 24,395 22,117
Depletion in Ending Inventory 183 267
Ending Accumulated Depletion 26,831 24,395
Carrying Amount 10,960 13,366
CANADA | Diavik [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 53,111 53,111
Ending Cost 53,111 53,111
Opening Accumulated Depletion 11,792 6,273
Ending Accumulated Depletion 17,872 11,792
Carrying Amount 35,239 41,319
CANADA | Ming [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 20,068 20,068
Net Additions (disposals) 2  
Ending Cost 20,070 20,068
Opening Accumulated Depletion 8,585 7,622
Depletion in Ending Inventory 276 171
Ending Accumulated Depletion 9,046 8,585
Carrying Amount 11,024 11,483
BRAZIL | Aurizona [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 11,033 11,000
Net Additions (disposals)   33
Ending Cost 11,033 11,033
Opening Accumulated Depletion 310 310
Ending Accumulated Depletion 310 310
Carrying Amount 10,723 10,723
BRAZIL | Chapada Mine [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 69,528 69,520
Net Additions (disposals)   8
Ending Cost 69,528 69,528
Opening Accumulated Depletion 2,737  
Ending Accumulated Depletion 6,502 2,737
Carrying Amount 63,026 66,791
MONGOLIA | Hugo North Extension and Heruga Gold Stream [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 35,351 42,493
Net Additions (disposals)   (7,142)
Ending Cost 35,351 35,351
Carrying Amount 35,351 35,351
BURKINA FASO | Karma Gold [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 26,289 21,174
Net Additions (disposals)   5,115
Ending Cost 26,289 26,289
Opening Accumulated Depletion 2,619  
Depletion in Ending Inventory 671 524
Ending Accumulated Depletion 6,203 2,619
Carrying Amount 20,086 23,670
TURKEY | Hot Maden [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 5,818 5,818
Ending Cost 5,818 5,818
Carrying Amount 5,818 5,818
MEXICO | Santa Elena [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 23,342 23,342
Ending Cost 23,342 23,342
Opening Accumulated Depletion 19,308 17,202
Depletion in Ending Inventory 166 105
Ending Accumulated Depletion 20,466 19,308
Carrying Amount 2,876 4,034
ARGENTINA | Yamana Silver Stream [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening Cost 74,234 74,229
Net Additions (disposals) 2 5
Ending Cost 74,236 74,234
Opening Accumulated Depletion 1,427  
Ending Accumulated Depletion 3,680 1,427
Carrying Amount 70,556 72,807
Current Period Depletion Expense [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion 28,263 27,654
Current Period Depletion Expense [member] | Other Royalties [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion 5,896 6,592
Current Period Depletion Expense [member] | Other [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion 103 69
Current Period Depletion Expense [member] | CANADA | Bachelor Lake [Member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion 3,823 4,411
Current Period Depletion Expense [member] | CANADA | Black Fox [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion 2,253 2,011
Current Period Depletion Expense [member] | CANADA | Diavik [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion 6,080 5,519
Current Period Depletion Expense [member] | CANADA | Ming [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion 185 792
Current Period Depletion Expense [member] | BRAZIL | Chapada Mine [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion 3,765 2,737
Current Period Depletion Expense [member] | BURKINA FASO | Karma Gold [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion 2,913 2,095
Current Period Depletion Expense [member] | MEXICO | Santa Elena [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion 992 2,001
Current Period Depletion Expense [member] | ARGENTINA | Yamana Silver Stream [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion 2,253 1,427
Current Period Depletion Expense From Prior Period Depletion In Ending Inventory [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Depletion in Ending Inventory   1,317
Mineral Streams Royalties And Other Interests Accounted For Under IFRS6 [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Carrying Amount 52,300 73,800
Property, plant and equipment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
Carrying Amount $ 313,200 $ 329,000