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INVENTORIES | 12 Months Ended
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Dec. 31, 2017
Inventories [Abstract] |
INVENTORIES | INVENTORIES
| Gold | Copper
| As at December 31, 2017 |  | As at December 31, 2016 |  | As at December 31, 2017 |  | As at December 31, 2016 |
Raw materials |  |  |  |
Ore in stockpiles |  | $2,125 |  |  | $2,067 |  |  | $102 |  |  | $72 |
Ore on leach pads | 405 |  | 406 |  | — |  | — |
Mine operating supplies | 515 |  | 585 |  | 79 |  | 62 |
Work in process | 174 |  | 219 |  | — |  | — |
Finished products | 168 |  | 50 |  | 3 |  | 5 |
|  | $3,387 |  |  | $3,327 |  |  | $184 |  |  | $139 |
Non-current ore in stockpiles 1 | (1,681 | ) | (1,536 | ) | — |  | — |
|  | $1,706 |  |  | $1,791 |  |  | $184 |  |  | $139 |
1 | Ore that we do not expect to process in the next 12 months is classified within other long-term assets.
Inventory Impairment Charges |  |
For the years ended December 31 | 2017 |  | 2016 |
Barrick Nevada |  | $— |  |  | $57 |
Golden Sunlight | 6 |  | 7 |
Porgera | 4 |  | 3 |
Pierina | 11 |  | 1 |
Inventory impairment charges 1 |  | $21 |  |  | $68 |
1 | Impairment charges in 2017 primarily relate to leach pad inventories at Pierina. Impairment charges in 2016 primarily relate to stockpiles at Cortez.
Ore in Stockpiles |  |
| As at December 31, 2017 |  | As at December 31, 2016 |
Gold |  |
Barrick Nevada |  | $1,040 |  |  | $1,128 |
Pueblo Viejo | 538 |  | 475 |
Porgera | 55 |  | 77 |
Kalgoorlie | 138 |  | 127 |
Lagunas Norte | 147 |  | 91 |
Buzwagi | 109 |  | 64 |
North Mara | 47 |  | 41 |
Veladero | 22 |  | 38 |
Turquoise Ridge | 26 |  | 22 |
Other | 3 |  | 4 |
Copper |  |
Lumwana | 102 |  | 72 |
|  | $2,227 |  |  | $2,139 |
Ore on Leach pads |  |
| As at December 31, 2017 |  | As at December 31, 2016 |
Gold |  |
Veladero |  | $145 |  |  | $172 |
Nevada | 105 |  | 109 |
Lagunas Norte | 143 |  | 97 |
Pierina | 12 |  | 28 |
|  | $405 |  |  | $406 |
Purchase Commitments At December 31, 2017, we had purchase obligations for supplies and consumables of approximately $1,147 million (2016: $970 million).

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