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COST OF SALES
 6 Months Ended
Jun. 30, 2023
Cost of sales [Abstract]  
Cost of Sales Cost of Sales
   Gold Copper
Other3
 Total
For the three months ended June 30 2023 2022 2023 2022 2023 2022 2023 2022
Site operating costs1,2
 $1,244  $1,163  $100  $76  $—  $—  $1,344  $1,239 
Depreciation1
 413  438  59  34  8  4  480  476 
Royalty expense 88  95  16  32  —  —  104  127 
Community relations 8  7  1  1  —  —  9  8 
$1,753  $1,703  $176  $143  $8  $4  $1,937  $1,850 
   Gold Copper
Other3
 Total
For the six months ended June 30 2023 2022 2023 2022 2023 2022 2023 2022
Site operating costs1,2
 $2,452  $2,231  $215  $159  $—  $—  $2,667  $2,390 
Depreciation1
 858  857  103  72  14  7  975  936 
Royalty expense 189  183  31  64  —  —  220  247 
Community relations 15  14  1  2  —  —  16  16 
$3,514  $3,285  $350  $297  $14  $7  $3,878  $3,589 
1Site operating costs and depreciation include charges to reduce the cost of inventory to net realizable value as follows: $1 million for the three months ended June 30, 2023 (2022: $31 million) and $14 million for the six months ended June 30, 2023 (2022: $31 million).
2Site operating costs includes the costs of extracting by-products.
3Other includes corporate amortization.