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COST OF SALES (Tables) | 6 Months Ended
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Jun. 30, 2019
Analysis of income and expense [abstract] |
Cost of sales |
| Gold | Copper | Other 3 | Total
For the three months ended June 30 | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Direct mining cost 1,2 |  | $921 |  |  | $716 |  |  | $63 |  |  | $69 |  |  | $— |  |  | $2 |  |  | $984 |  |  | $787 |
Depreciation | 431 |  | 290 |  | 28 |  | 30 |  | 7 |  | 8 |  | 466 |  | 328 |
Royalty expense | 78 |  | 43 |  | 9 |  | 8 |  | — |  | — |  | 87 |  | 51 |
Community relations | 7 |  | 9 |  | 1 |  | 1 |  | — |  | — |  | 8 |  | 10 |
|  | $1,437 |  |  | $1,058 |  |  | $101 |  |  | $108 |  |  | $7 |  |  | $10 |  |  | $1,545 |  |  | $1,176 |
| Gold | Copper | Other 3 | Total
For the six months ended June 30 | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Direct mining cost 1,2 |  | $1,815 |  |  | $1,406 |  |  | $139 |  |  | $135 |  |  | $— |  |  | $4 |  |  | $1,954 |  |  | $1,545 |
Depreciation | 815 |  | 588 |  | 70 |  | 49 |  | 16 |  | 16 |  | 901 |  | 653 |
Royalty expense | 144 |  | 93 |  | 21 |  | 17 |  | — |  | — |  | 165 |  | 110 |
Community relations | 13 |  | 17 |  | 2 |  | 3 |  | — |  | — |  | 15 |  | 20 |
|  | $2,787 |  |  | $2,104 |  |  | $232 |  |  | $204 |  |  | $16 |  |  | $20 |  |  | $3,035 |  |  | $2,328 |
1 | Direct mining cost includes charges to reduce the cost of inventory to net realizable value as follows: $12 million for the three months ended June 30, 2019 (2018: $2 million) and $16 million for the six months ended June 30, 2019 (2018: $5 million).
2 | Direct mining cost includes the costs of extracting by-products.
3 | Other includes realized hedge gains and losses and corporate amortization.

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