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Segmented Information - Summary of Information Relati (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Revenue $ 1,338,812 $ 1,350,759
Production costs and royalties 724,166 868,018
Depreciation 254,469 253,453
Mine operating earnings 360,177 229,288
Mine care and maintenance 102,105 23,662
Capital expenditures 191,657 225,077
Silver Segment [member]    
Disclosure of operating segments [line items]    
Revenue 630,609 785,366
Production costs and royalties 396,138 538,054
Depreciation 138,086 172,299
Mine operating earnings 96,385 75,013
Mine care and maintenance 88,519 17,738
Capital expenditures 109,390 130,003
Gold Segment [member]    
Disclosure of operating segments [line items]    
Revenue 708,203 565,393
Production costs and royalties 328,028 329,964
Depreciation 114,850 79,824
Mine operating earnings 265,325 155,605
Mine care and maintenance 7,567 0
Capital expenditures 81,410 94,584
Dolores mine [member] | Mexico | Silver Segment [member]    
Disclosure of operating segments [line items]    
Revenue 250,219 248,744
Production costs and royalties 146,961 191,320
Depreciation 87,694 104,701
Mine operating earnings 15,564 (47,277)
Mine care and maintenance 10,175 0
Capital expenditures 44,861 50,657
La Colorada mine [member] | Mexico | Silver Segment [member]    
Disclosure of operating segments [line items]    
Revenue 128,824 177,698
Production costs and royalties 69,663 75,139
Depreciation 19,608 23,175
Mine operating earnings 39,553 79,384
Mine care and maintenance 7,973 0
Capital expenditures 29,388 20,275
Huaron mine [member] | Peru | Silver Segment [member]    
Disclosure of operating segments [line items]    
Revenue 72,073 117,118
Production costs and royalties 39,612 76,962
Depreciation 7,069 13,638
Mine operating earnings 25,392 26,518
Mine care and maintenance 20,840 0
Capital expenditures 4,500 10,936
Morococha mine [member] | Peru | Silver Segment [member]    
Disclosure of operating segments [line items]    
Revenue 47,046 101,549
Production costs and royalties 35,768 73,396
Depreciation 7,203 15,482
Mine operating earnings 4,075 12,671
Mine care and maintenance 20,023 0
Capital expenditures 10,168 15,556
San Vicente mine [member] | Bolivia | Silver Segment [member]    
Disclosure of operating segments [line items]    
Revenue 48,396 76,968
Production costs and royalties 35,753 57,805
Depreciation 6,725 9,449
Mine operating earnings 5,918 9,714
Mine care and maintenance 2,890 0
Capital expenditures 4,877 4,960
Manantial Espejo mine [member] | Argentina | Silver Segment [member]    
Disclosure of operating segments [line items]    
Revenue 84,051 63,289
Production costs and royalties 68,381 63,432
Depreciation 9,787 5,854
Mine operating earnings 5,883 (5,997)
Mine care and maintenance 5,617 0
Capital expenditures 10,789 26,512
Escobal mine [member] | Guatemala | Silver Segment [member]    
Disclosure of operating segments [line items]    
Revenue 0
Production costs and royalties 0 0
Depreciation 0
Mine operating earnings 0 0
Mine care and maintenance 21,001 17,738
Capital expenditures 4,807 1,107
Shahuindo mine [member] | Peru | Gold Segment [member]    
Disclosure of operating segments [line items]    
Revenue 270,043 189,372
Production costs and royalties 97,940 90,877
Depreciation 40,562 28,649
Mine operating earnings 131,541 69,846
Mine care and maintenance 3,855 0
Capital expenditures 23,335 33,280
La Arena mine [member] | Peru | Gold Segment [member]    
Disclosure of operating segments [line items]    
Revenue 176,028 174,803
Production costs and royalties 72,676 99,915
Depreciation 27,683 14,873
Mine operating earnings 75,669 60,015
Mine care and maintenance 3,712 0
Capital expenditures 37,324 47,557
Timmins mine [member] | Canada | Gold Segment [member]    
Disclosure of operating segments [line items]    
Revenue 262,132 201,218
Production costs and royalties 157,412 139,172
Depreciation 46,605 36,302
Mine operating earnings 58,115 25,744
Mine care and maintenance 0 0
Capital expenditures 20,751 13,747
Pas Corp mine [member] | Canada | Other Segment [member]    
Disclosure of operating segments [line items]    
Revenue 0
Production costs and royalties 0 0
Depreciation 491 488
Mine operating earnings (491) (488)
Mine care and maintenance 0 0
Capital expenditures 297 396
Navidad mine [member] | Argentina | Other Segment [member]    
Disclosure of operating segments [line items]    
Revenue 0
Production costs and royalties 0 0
Depreciation 0 0
Mine operating earnings 0 0
Mine care and maintenance 6,019 5,924
Capital expenditures 0 9
Other [member] | Other | Other Segment [member]    
Disclosure of operating segments [line items]    
Revenue 0 0
Production costs and royalties 0 0
Depreciation 1,042 842
Mine operating earnings (1,042) (842)
Mine care and maintenance 0 0
Capital expenditures $ 560 $ 85