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Commitments - Disclosure of detailed information about significant commitments for streams and offtakes (Details)
 12 Months Ended
Dec. 31, 2019
Amulsar stream [Member]  
Disclosure Of Commitments [Line Items]  
Term of agreement 40 years
Amulsar Offtake [Member]  
Disclosure Of Commitments [Line Items]  
Term of agreement Until delivery of 2,110,425 ounces Au
Back Forty stream [Member]  
Disclosure Of Commitments [Line Items]  
Term of agreement Life of mine
Mantos Blancos stream [Member]  
Disclosure Of Commitments [Line Items]  
Term of agreement Life of mine
Renard stream [Member]  
Disclosure Of Commitments [Line Items]  
Term of agreement 40 years
Sasa stream [Member]  
Disclosure Of Commitments [Line Items]  
Term of agreement 40 years
Gibraltar stream [Member]  
Disclosure Of Commitments [Line Items]  
Per ounce/carat price 2.75
Term of agreement Life of mine
Gold Metal Member | Amulsar stream [Member]  
Disclosure Of Commitments [Line Items]  
Attributable payable production to be purchased, percentage 4.22%
Per ounce/carat price 400
Gold Metal Member | Amulsar Offtake [Member]  
Disclosure Of Commitments [Line Items]  
Attributable payable production to be purchased, percentage 81.91%
Per ounce/carat price Based on quotational period
Gold Metal Member | Back Forty stream [Member]  
Disclosure Of Commitments [Line Items]  
Attributable payable production to be purchased, percentage 18.50%
Per ounce/carat price 30% spot price (max $600)
Silver [Member] | Amulsar stream [Member]  
Disclosure Of Commitments [Line Items]  
Attributable payable production to be purchased, percentage 62.50%
Per ounce/carat price 4
Silver [Member] | Back Forty stream [Member]  
Disclosure Of Commitments [Line Items]  
Attributable payable production to be purchased, percentage 75.00%
Per ounce/carat price 4
Silver [Member] | Mantos Blancos stream [Member]  
Disclosure Of Commitments [Line Items]  
Attributable payable production to be purchased, percentage 100.00%
Per ounce/carat price 8% spot
Silver [Member] | Sasa stream [Member]  
Disclosure Of Commitments [Line Items]  
Attributable payable production to be purchased, percentage 100.00%
Per ounce/carat price 5
Silver [Member] | Gibraltar stream [Member]  
Disclosure Of Commitments [Line Items]  
Attributable payable production to be purchased, percentage 75.00%
Per ounce/carat price 2.75
Diamond [Member] | Renard stream [Member]  
Disclosure Of Commitments [Line Items]  
Attributable payable production to be purchased, percentage 9.60%
Per ounce/carat price Lesser of 40% of sales price or $40