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Commitments (Details)
lb in Millions
 12 Months Ended
Dec. 31, 2017
$ / oz
lb
oz
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 (as a percent) 5.00%
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, Peru  
Commitments  
Attributable payable production of platinum group metals to be purchased (as a percent) 0.00%
Payment for each ounce of gold (as a percent) 20.00%
Payment for each ounce of silver (as a percent) 20.00%
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%
Purchase price per ounce of silver as a percent of average or spot price upon initial delivery 20.00%
Maximum ounces of silver on which on-going price of spot price is payable 12,800,000
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
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) | $ / oz 400
Payment for each ounce of silver (in dollars per ounce) | $ / oz 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
Maximum ounces of gold on which on-going price of spot price is payable 720,000
Cobre Panama Tranche One  
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) | $ / oz 418
Payment for each ounce of silver (in dollars per ounce) | $ / oz 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 9,842,000
Maximum ounces of silver on which on-going price of spot price is payable 21,510,000
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 | $ / oz 406
Purchase price per ounce of gold per ounce upon delivery initial post inflation adjustment | $ / oz 418.27
Quantity of delivered gold ounces before purchase decreases to next threshold from initial threshold 1,341,000
Silver price per ounce of silver per ounce upon delivery initial | $ / oz 6.09
Purchase price per ounce of silver per ounce upon delivery initial post inflation adjustment | $ / oz 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
Copper for stated ounces of gold | lb 1
Copper pounds per gold ounces to purchase threshold 2 81
Ounces of gold receivable per every 1 million pounds of copper produced | lb 1
Maximum ounces of gold receivable for second threshold 1,716,188
Ounces of silver receivable per every 1 million pounds of copper produced 1,376
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 | lb 1
Ounces Of Silver Delivered Under Threshold 2 Before Committed Quantities Reduces 29,731,000
Cobre Panama Tranche Two  
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) | $ / oz 20
Payment for each ounce of silver (in dollars per ounce) | $ / oz 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 2,460,500
Purchase price per ounce of silver as a percent of average or spot price upon initial delivery 20.00%
Maximum ounces of silver on which on-going price of spot price is payable 9,618,000
Quantity of delivered gold ounces before payable production to be purchased decreases to next threshold from initial threshold 202,000
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 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
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 (as a percent) 20.00%
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
Guadalupe  
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) | $ / oz 800
Term of agreement 40 years
Sabodala  
Commitments  
Attributable payable production of gold to be purchased (as a percent) 6.00%
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 (as a percent) 20.00%
Term of agreement 40 years
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) 1,875
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) | $ / oz 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) | $ / oz 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) | $ / oz 400
Payment for each ounce of PGM (in dollars per ounce) | $ / oz 400
Term of agreement 40 years
Percentage of purchase commitment 50.00%