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COST OF SALES
 6 Months Ended
Jun. 30, 2020
Analysis of income and expense [abstract]  
COST OF SALES COST OF SALES
   Gold Copper
Other3
 Total
For the three months ended June 30 2020 2019 2020 2019 2020 2019 2020 2019
Direct mining cost1,2
 $1,121    $921    $79    $63    $2    $—    $1,202    $984   
Depreciation 498    431    63    28    5    7    566    466   
Royalty expense 116    78    11    9    —    —    127    87   
Community relations 5    7    —    1    —    —    5    8   
$1,740    $1,437    $153    $101    $7    $7    $1,900    $1,545   
   Gold Copper
Other3
 Total
For the six months ended June 30 2020 2019 2020 2019 2020 2019 2020 2019
Direct mining cost1,2
 $2,201    $1,815    $148    $139    $4    $—    $2,353    $1,954   
Depreciation 972    815    106    70    12    16    1,090    901   
Royalty expense 200    144    22    21    —    —    222    165   
Community relations 10    13    1    2    —    —    11    15   
$3,383    $2,787    $277    $232    $16    $16    $3,676    $3,035   
1Direct mining cost includes charges to reduce the cost of inventory to net realizable value as follows: $1 million for the three months ended June 30, 2020 (2019: $12 million) and $18 million for the six months ended June 30, 2020 (2019: $16 million).
2Direct mining cost includes the costs of extracting by-products.
3Other includes realized hedge gains and losses and corporate amortization.