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Segmented Information - Schedule of Net Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]    
Assets $ 3,461,682 $ 1,937,476
Liabilities 993,836 424,127
Net assets 2,467,846 1,513,349
Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 1,672,870 1,372,516
Liabilities 342,714 353,610
Net assets 1,330,156 1,018,906
Gold Segment [member]    
Disclosure of operating segments [line items]    
Assets 1,312,134  
Liabilities 303,464  
Net assets 1,008,670  
Dolores mine [member] | Mexico | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 763,301 791,485
Liabilities 137,396 150,003
Net assets 625,905 641,482
La Colorada mine [member] | Mexico | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 223,416 230,736
Liabilities 46,476 56,206
Net assets 176,940 174,530
Huaron mine [member] | Peru | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 110,642 119,015
Liabilities 39,962 44,055
Net assets 70,680 74,960
Morococha mine [member] | Peru | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 128,280 126,755
Liabilities 36,754 40,183
Net assets 91,526 86,572
San Vicente mine [member] | Bolivia | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 76,418 83,686
Liabilities 35,331 38,169
Net assets 41,087 45,517
Manantial Espejo mine [member] | Argentina | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 77,635 20,839
Liabilities 27,455 24,994
Net assets 50,180 (4,155)
Escobal mine [member] | Guatemala | Silver Segment [member]    
Disclosure of operating segments [line items]    
Assets 293,178  
Liabilities 19,340  
Net assets 273,838  
Shahuindo mine [member] | Peru | Gold Segment [member]    
Disclosure of operating segments [line items]    
Assets 600,096  
Liabilities 162,821  
Net assets 437,275  
La Arena mine [member] | Peru | Gold Segment [member]    
Disclosure of operating segments [line items]    
Assets 282,978  
Liabilities 90,472  
Net assets 192,506  
Timmins mine [member] | Canada | Gold Segment [member]    
Disclosure of operating segments [line items]    
Assets 429,060  
Liabilities 50,171  
Net assets 378,889  
Pas Corp mine [member] | Canada | Other Segment [member]    
Disclosure of operating segments [line items]    
Assets 229,814 247,792
Liabilities 304,184 30,221
Net assets (74,370) 217,571
Navidad mine [member] | Argentina | Other Segment [member]    
Disclosure of operating segments [line items]    
Assets 193,034 193,777
Liabilities 0 1,546
Net assets 193,034 192,231
Other [member] | Other | Other Segment [member]    
Disclosure of operating segments [line items]    
Assets 53,830 123,391
Liabilities 43,474 38,750
Net assets $ 10,356 $ 84,641