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COST OF SALES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Direct mining cost | $ 984 | $ 787 | $ 1,954 | $ 1,545
Depreciation expense | 466 | 328 | 901 | 653
Royalty expense | 87 | 51 | 165 | 110
Community relations | 8 | 10 | 15 | 20
Cost of sales | 1,545 | 1,176 | 3,035 | 2,328
Inventory reduction amount | 12 | 2 | 16 | 5
Gold |  |  |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Direct mining cost | 921 | 716 | 1,815 | 1,406
Depreciation expense | 431 | 290 | 815 | 588
Royalty expense | 78 | 43 | 144 | 93
Community relations | 7 | 9 | 13 | 17
Cost of sales | 1,437 | 1,058 | 2,787 | 2,104
Copper |  |  |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Direct mining cost | 63 | 69 | 139 | 135
Depreciation expense | 28 | 30 | 70 | 49
Royalty expense | 9 | 8 | 21 | 17
Community relations | 1 | 1 | 2 | 3
Cost of sales | 101 | 108 | 232 | 204
Other |  |  |  |
Disclosure of Detailed Information About Cost of Sales [Line Items] |  |  |  |
Direct mining cost | 0 | 2 | 0 | 4
Depreciation expense | 7 | 8 | 16 | 16
Royalty expense | 0 | 0 | 0 | 0
Community relations | 0 | 0 | 0 | 0
Cost of sales | $ 7 | $ 10 | $ 16 | $ 20

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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 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_103&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2018-01-01 -Paragraph 36 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=para_36_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_98_a&doctype=Standard -URIDate 2018-03-16 + Details
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