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Commitments (Details) - 6 months ended Jun. 30, 2021
t in Millions, lb in Millions
$ / oz
oz
t
oz
lb
USD ($)
$ / oz
$ / shares
Antamina            
Commitments            
Attributable payable production of gold to be purchased (as a percent) 0.00%          
Attributable payable production of silver to be purchased (as a percent) 22.50%          
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%          
Payment for each ounce of silver (in dollars per ounce) 5          
Term of agreement 40 years          
Fixed silver payability (as a percent) 90.00%          
Percentage of reduction in spot price after maximum ounces of silver have been delivered under the stream agreement 15.00%          
Maximum ounces of silver on which on-going price of spot price is payable   86,000,000        
Purchase price per ounce of silver as a percent of average or spot price upon initial delivery 5.00%          
Antapaccay            
Commitments            
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%          
Payment for each ounce of gold (in dollars per ounce) 20          
Payment for each ounce of silver (in dollars per ounce) 20          
Term of agreement 40 years          
Percentage of reduction in spot price after maximum ounces of silver have been delivered under the stream agreement 30.00%          
Maximum ounces of silver on which on-going price of spot price is payable   12,800,000        
Purchase price per ounce of silver as a percent of average or spot price upon initial delivery 20.00%          
Ounces of gold receivable for each 1,000 tonnes of copper   300        
Copper for 300 ounces of gold   1,000        
Quantity of delivered gold ounces before payable production to be purchased decreases to next threshold from initial threshold   630,000        
Percentage of gold receivable after initial threshold is achieved 30.00%          
Ounces of silver receivable for each 1,l000 tonnes of copper   4,700        
Copper for 4,700 ounces of silver   1,000        
Maximum ounces of silver receivable   10,000,000.0        
Percentage of spot price of gold on which on-going price is paid 20.00%          
Maximum ounces of gold on which on-going price of spot price is payable   750,000        
Percentage of spot price of gold on which on-going price is paid after maximum ounces have been delivered 30.00%          
Percentage of spot price of silver on which on-going price is paid after maximum ounces have been delivered 30.00%          
Candelaria            
Commitments            
Attributable payable production of gold to be purchased (as a percent) 68.00%          
Attributable payable production of silver to be purchased (as a percent) 68.00%          
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%          
Payment for each ounce of gold (in dollars per ounce) 400          
Payment for each ounce of silver (in dollars per ounce) 4.00          
Term of agreement 40 years          
Percentage of reduction in spot price after maximum ounces of silver have been delivered under the stream agreement 40.00%          
Maximum ounces of silver on which on-going price of spot price is payable   12,000,000.0        
Maximum ounces of gold on which on-going price of spot price is payable   720,000        
Cobre Panama Fixed Payment Stream            
Commitments            
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%          
Payment for each ounce of gold (in dollars per ounce) 418          
Payment for each ounce of silver (in dollars per ounce) 6.27          
Term of agreement 40 years          
Percentage of reduction in spot price after maximum ounces of silver have been delivered under the stream agreement 62.10%          
Percentage of reduction in spot price after maximum ounces of gold have been delivered under the stream agreement 63.40%          
Maximum ounces of silver on which on-going price of spot price is payable   21,510,000        
Maximum ounces of silver on which on-going price of spot price is payable   9,842,000        
Quantity of delivered gold ounces before payable production to be purchased decreases to next threshold from initial threshold   808,000        
Purchase price per ounce of gold per ounce upon delivery initial post inflation adjustment | $       418.27    
The mill through put number of consecutive days of commensurate 30 days          
The annual capacity of tonnes per annum reached by period end. | t 58          
Annual rate of return on upfront payments until the mill throughput is achieved 5.00%          
The reduction of applicable fixed gold price per ounce (in dollar per ounce) | $ / oz 100          
Quantity of delivered gold ounces before purchase decreases to next threshold from initial threshold 1,341,000          
Purchase price per ounce of silver per ounce upon delivery initial post inflation adjustment | $ / shares           $ 6.27
Percentage of spot price of gold on which on-going price is paid after maximum ounces have been delivered 50.00%          
Percentage of spot price of silver on which on-going price is paid after maximum ounces have been delivered 50.00%          
Ounces of gold receivable per every 1 million pounds of copper produced   120 1      
Copper for stated ounces of gold | lb     1      
Copper pounds per gold ounces to purchase threshold 2   81        
Maximum ounces of gold receivable for second threshold   1,716,188        
Ounces of silver receivable per every 1 million pounds of copper produced | lb     1      
Copper for stated ounces of silver | lb     1      
Number of payable Silver ounces to be purchased per quantity of pounds of copper   1,776        
Ounces of silver receivable per every 1 million pounds of copper produced   1,376        
Ounces Of Silver Delivered Under Threshold 2 Before Committed Quantities Reduces   29,731,000        
Cobre Panama Floating Payment Stream            
Commitments            
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%          
Payment for each ounce of gold (in dollars per ounce) 20          
Payment for each ounce of silver (in dollars per ounce) 20          
Term of agreement 40 years          
Percentage of reduction in spot price after maximum ounces of silver have been delivered under the stream agreement 15.53%          
Percentage of reduction in spot price after maximum ounces of gold have been delivered under the stream agreement 15.85%          
Maximum ounces of silver on which on-going price of spot price is payable   9,618,000        
Maximum ounces of silver on which on-going price of spot price is payable   2,460,500        
Quantity of delivered gold ounces before payable production to be purchased decreases to next threshold from initial threshold   202,000        
The mill through put number of consecutive days of commensurate 30 days          
The annual capacity of tonnes per annum reached by period end. | t 58          
Annual rate of return on upfront payments until the mill throughput is achieved 5.00%          
The reduction of applicable fixed gold price per ounce (in dollar per ounce) | $ / oz 100          
Percentage of spot price of gold on which on-going price is paid 20.00%          
Maximum ounces of gold on which on-going price of spot price is payable   604,000        
Percentage of spot price of gold on which on-going price is paid after maximum ounces have been delivered 50.00%          
Percentage of spot price of silver on which on-going price is paid 20.00%          
Percentage of spot price of silver on which on-going price is paid after maximum ounces have been delivered 50.00%          
Ounces of gold receivable per every 1 million pounds of copper produced   30        
Copper for stated ounces of gold | lb     1      
Copper pounds per gold ounces to purchase threshold 2   20.25        
Ounces of gold receivable per every 1 million pounds of copper produced | lb     1      
Maximum ounces of gold receivable for second threshold   429,047        
Ounces of silver receivable per every 1 million pounds of copper produced   344        
Copper for stated ounces of silver | lb     1      
Number of payable Silver ounces to be purchased per quantity of pounds of copper   444        
Ounces of silver receivable per every 1 million pounds of copper produced | lb     1      
Ounces Of Silver Delivered Under Threshold 2 Before Committed Quantities Reduces   7,432,750        
Condestable            
Commitments            
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%          
Payment for each ounce of gold (in dollars per ounce) 20          
Payment for each ounce of silver (in dollars per ounce) 20          
Term of agreement 40 years          
Percentage of gold receivable after initial threshold is achieved 25.00%          
Maximum ounces of silver receivable   291,000        
Maximum ounces of gold receivable for first threshold   8,760        
Deliveries of ounces of refined gold threshold 87,600          
Refined gold delivery as percentage of production from stream area 63.00%          
Deliveries of refined silver threshold ounces 2,910,000          
Refined silver delivery as percentage of production from stream area 63.00%          
Percentage of silver delivered after second phase 25.00%          
Karma            
Commitments            
Attributable payable production of gold to be purchased (as a percent) 4.875%          
Attributable payable production of silver to be purchased (as a percent) 0.00%          
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%          
Payment for each ounce of gold (in dollars per ounce) 20          
Term of agreement 40 years          
Percentage of gold receivable after initial threshold is achieved 4.875%          
Percentage of spot price of gold on which on-going price is paid 20.00%          
Maximum ounces of gold receivable (per annum)   15,000        
Aggregate gold ounces delivered to increase the upfront deposit   5,625        
Gold ounces delivered to increase the upfront deposit (per quarter)   703        
Guadalupe-Palmarejo            
Commitments            
Attributable payable production of gold to be purchased (as a percent) 50.00%          
Attributable payable production of silver to be purchased (as a percent) 0.00%          
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%          
Payment for each ounce of gold (in dollars per ounce) 800          
Term of agreement 40 years          
Sabodala            
Commitments            
Attributable payable production of silver to be purchased (as a percent) 0.00%          
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%          
Payment for each ounce of gold (in dollars per ounce) 20          
Term of agreement 40 years          
Maximum ounces of gold threshold   105,750        
Percentage of gold receivable after initial threshold is achieved 6.00%          
Percentage of spot price of gold on which on-going price is paid 20.00%          
Maximum ounces of gold receivable (per month)   783.33        
MWS            
Commitments            
Attributable payable production of gold to be purchased (as a percent) 25.00%          
Attributable payable production of silver to be purchased (as a percent) 0.00%          
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%          
Payment for each ounce of gold (in dollars per ounce) 400          
Term of agreement 40 years          
Ounces of gold capped under agreement   312,500        
Cooke 4            
Commitments            
Attributable payable production of gold to be purchased (as a percent) 7.00%          
Attributable payable production of silver to be purchased (as a percent) 0.00%          
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%          
Payment for each ounce of gold (in dollars per ounce) 400          
Term of agreement 40 years          
Sudbury            
Commitments            
Attributable payable production of gold to be purchased (as a percent) 50.00%          
Attributable payable production of silver to be purchased (as a percent) 0.00%          
Attributable payable production of platinum group metals to be purchased (as a percent) 50.00%          
Payment for each ounce of gold (in dollars per ounce) 400          
Term of agreement 40 years          
Percentage of purchase commitment 50.00%          
Sudbury | Gold spot price is greater than $800 per ounce but less than $1,333 per ounce            
Commitments            
Payment for each ounce of gold (in dollars per ounce) | $ / oz         800  
Sudbury | Gold spot price is greater than $1,333 per ounce but less than $2,000 per ounce            
Commitments            
Payment for each ounce of gold (as a percent) 60.00%          
Sudbury | Gold spot price is greater than $2,000            
Commitments            
Payment for each ounce of gold (in dollars per ounce) | $ / oz         1,200