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Inventories, Including Long-Term Mill and Leach Stockpiles - Schedule of Inventory (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Current inventories: |  |
Total materials and supplies, net | $ 1,776 | $ 1,669
Mill stockpiles | 196 | 193
Leach stockpiles | 1,191 | 977
Total current mill and leach stockpiles | 1,387 | 1,170
Raw materials (primarily concentrate) | 436 | 536
Work-in-process | 155 | 195
Finished goods | 916 | 927
Total product | 1,507 | 1,658
Long-term inventories: |  |
Mill stockpiles | 201 | 226
Leach stockpiles | 1,029 | 1,161
Total long-term mill and leach stockpiles | 1,230 | 1,387
Inventory obsolescence reserves | $ 39 | $ 36

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