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Segmented Information - Schedule of Net Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Assets $ 3,433,875 $ 3,461,682
Liabilities 828,036 993,836
Net assets 2,605,839 2,467,846
Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 1,665,640 1,672,870
Liabilities 385,897 342,714
Net assets 1,279,743 1,330,156
Gold Segment [member]    
Disclosure of operating segments [line items]    
Assets 1,280,502 1,312,134
Liabilities 374,384 303,464
Net assets 906,118 1,008,670
Dolores mine [member] | Mexico | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 752,873 763,301
Liabilities 169,444 137,396
Net assets 583,429 625,905
La Colorada mine [member] | Mexico | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 231,217 223,416
Liabilities 48,971 46,476
Net assets 182,246 176,940
Huaron mine [member] | Peru | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 113,177 110,642
Liabilities 40,663 39,962
Net assets 72,514 70,680
Morococha mine [member] | Peru | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 121,004 128,280
Liabilities 34,906 36,754
Net assets 86,098 91,526
San Vicente mine [member] | Bolivia | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 83,668 76,418
Liabilities 40,536 35,331
Net assets 43,132 41,087
Manantial Espejo mine [member] | Argentina | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 75,113 77,635
Liabilities 26,950 27,455
Net assets 48,163 50,180
Escobal mine [member] | Guatemala | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 288,588 293,178
Liabilities 24,427 19,340
Net assets 264,161 273,838
Shahuindo mine [member] | Peru | Gold Segment [member]    
Disclosure of operating segments [line items]    
Assets 566,734 600,096
Liabilities 201,427 162,821
Net assets 365,307 437,275
La Arena mine [member] | Peru | Gold Segment [member]    
Disclosure of operating segments [line items]    
Assets 299,372 282,978
Liabilities 112,475 90,472
Net assets 186,897 192,506
Timmins mine [member] | Canada | Gold Segment [member]    
Disclosure of operating segments [line items]    
Assets 414,396 429,060
Liabilities 60,482 50,171
Net assets 353,914 378,889
Pas Corp mine [member] | Canada | Other Segment [member]    
Disclosure of operating segments [line items]    
Assets 230,872 229,814
Liabilities 18,795 304,184
Net assets 212,077 (74,370)
Navidad mine [member] | Argentina | Other Segment [member]    
Disclosure of operating segments [line items]    
Assets 192,999 193,034
Liabilities 0 0
Net assets 192,999 193,034
Other [member] | Other | Other Segment [member]    
Disclosure of operating segments [line items]    
Assets 63,862 53,830
Liabilities 48,960 43,474
Net assets $ 14,902 $ 10,356