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Revenue (Tables)
 6 Months Ended
Jun. 30, 2020
Revenue [abstract]  
Revenue
   For the three months ended June 30 For the six months ended June 30
   2020 2019 2020 2019
Gold sales
Spot market sales $2,617    $1,928    $5,172    $3,822   
Concentrate sales 191    8    229    20   
Provisional pricing adjustments 4    1    4    1   
$2,812    $1,937    $5,405    $3,843   
Copper sales
Copper concentrate sales $157    $112    $280    $253   
Provisional pricing adjustments 27    (9)   3    13   
$184    $103    $283    $266   
Other sales1
 59    23    88    47   
Total $3,055    $2,063    $5,776    $4,156   
1Revenues include the sale of by-products for our gold and copper mines including silver revenue of $19 million for the three months ended June 30, 2020 (2019: $23 million) and $30 million for the six months ended June 30, 2020 (2019: $47 million).