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COST OF SALES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Site operating costs | $ 1,081 | $ 1,202 | $ 2,166 | $ 2,353
Depreciation expense | 500 | 566 | 1,007 | 1,090
Royalty expense | 117 | 127 | 233 | 222
Community relations | 6 | 5 | 10 | 11
Cost of sales | 1,704 | 1,900 | 3,416 | 3,676
Inventory write-down | 0 | 1 | 14 | 18
Gold |  |  |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Site operating costs | 1,016 | 1,121 | 2,036 | 2,201
Depreciation expense | 448 | 498 | 902 | 972
Royalty expense | 92 | 116 | 185 | 200
Community relations | 5 | 5 | 9 | 10
Cost of sales | 1,561 | 1,740 | 3,132 | 3,383
Copper |  |  |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Site operating costs | 65 | 79 | 130 | 148
Depreciation expense | 46 | 63 | 94 | 106
Royalty expense | 25 | 11 | 48 | 22
Community relations | 1 | 0 | 1 | 1
Cost of sales | 137 | 153 | 273 | 277
Other |  |  |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Site operating costs | 0 | 2 | 0 | 4
Depreciation expense | 6 | 5 | 11 | 12
Royalty expense | 0 | 0 | 0 | 0
Community relations | 0 | 0 | 0 | 0
Cost of sales | $ 6 | $ 7 | $ 11 | $ 16

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_103&doctype=Standard -URIDate 2020-01-01 + Details
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