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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2018
Mineral Industries Disclosures [Abstract] |
Schedule Of Estimated Recoverable Proven And Probable Reserves By Location [Text Block] |
| Estimated Recoverable Proven and Probable Mineral Reserves
| at December 31, 2018
| Copper a (billion pounds) |  | Gold (million ounces) |  | Molybdenum (billion pounds)
North America | 49.9 |  |  | 0.6 |  |  | 3.06 |
South America | 33.5 |  |  | — |  |  | 0.72 |
Indonesia | 36.2 |  | b | 30.2 |  | b | — |
Consolidated c | 119.6 |  |  | 30.8 |  |  | 3.78 |
Net equity interest d | 86.8 |  |  | 17.0 |  |  | 3.44 |
a. | Estimated consolidated recoverable copper reserves included 2.0 billion pounds in leach stockpiles and 0.6 billion pounds in mill stockpiles.
b. | Includes 13.0 billion pounds of copper and 10.1 million ounces of gold associated with PT-FI's acquisition of the Rio Tinto Joint Venture interest. Estimated recoverable proven and probable reserves from Indonesia reflect estimates of minerals that can be recovered through 2041. Refer to Note 13 for discussion of PT-FI’s IUPK.
c. | Consolidated reserves represent estimated metal quantities after reduction for joint venture partner interests at the Morenci mine in North America (refer to Note 3 for further discussion). Excluded from the table above were FCX’s estimated recoverable proven and probable reserves of 393.1 million ounces of silver, which were determined using $15 per ounce and include 55.7 million ounces associated with PT-FI's acquisition of the Rio Tinto Joint Venture interest.
d. | Net equity interest reserves represent estimated consolidated metal quantities further reduced for noncontrolling interest ownership (refer to Note 3 for further discussion of FCX’s ownership in subsidiaries). FCX's net equity interest for estimated metal quantities in Indonesia reflects approximately 81 percent from 2019 through 2022 and 48.76 percent from 2023 through 2041. Excluded from the table above were FCX’s estimated recoverable proven and probable reserves of 269.3 million ounces of silver.
Supplementary Reserve Information at 100% Basis by Location |
|  | Estimated Recoverable Proven and Probable Mineral Reserves
|  | at December 31, 2018
|  |  |  | Average Ore Grade Per Metric Ton a |  | Recoverable Proven and Probable Reserves b
|  | Ore a (million metric tons) |  | Copper (%) |  | Gold (grams) |  | Molybdenum (%) |  | Copper (billion pounds) |  | Gold (million ounces) |  | Molybdenum (billion pounds)
North America |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed and producing: |  |  |  |  |  |  |  |  |  |  |  |
Morenci |  | 4,619 |  |  | 0.24 |  |  | — |  |  | — |  | c | 15.6 |  |  | — |  |  | 0.18 |
Sierrita |  | 3,369 |  |  | 0.23 |  |  | — |  | c | 0.02 |  |  | 14.0 |  |  | 0.2 |  |  | 1.42 |
Bagdad |  | 2,426 |  |  | 0.32 |  |  | — |  | c | 0.02 |  |  | 14.7 |  |  | 0.1 |  |  | 0.74 |
Safford, including Lone Star d |  | 839 |  |  | 0.44 |  |  | — |  |  | — |  |  | 6.2 |  |  | — |  |  | — |
Chino, including Cobre |  | 395 |  |  | 0.46 |  |  | 0.03 |  |  | 0.01 |  |  | 3.4 |  |  | 0.3 |  |  | 0.01 |
Climax |  | 168 |  |  | — |  |  | — |  |  | 0.15 |  |  | — |  |  | — |  |  | 0.52 |
Henderson |  | 71 |  |  | — |  |  | — |  |  | 0.17 |  |  | — |  |  | — |  |  | 0.24 |
Tyrone |  | 55 |  |  | 0.25 |  |  | — |  |  | — |  |  | 0.3 |  |  | — |  |  | — |
Miami |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.1 |  |  | — |  |  | — |
South America |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed and producing: |  |  |  |  |  |  |  |  |  |  |  |
Cerro Verde |  | 4,324 |  |  | 0.35 |  |  | — |  |  | 0.01 |  |  | 29.6 |  |  | — |  |  | 0.72 |
El Abra |  | 705 |  |  | 0.42 |  |  | — |  |  | — |  |  | 3.9 |  |  | — |  |  | — |
Indonesia e |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed and producing: |  |  |  |  |  |  |  |  |  |
Deep Mill Level Zone |  | 432 |  |  | 0.92 |  |  | 0.76 |  |  | — |  |  | 7.6 |  |  | 8.4 |  |  | — |
Deep Ore Zone |  | 51 |  |  | 0.50 |  |  | 0.57 |  |  | — |  |  | 0.5 |  |  | 0.8 |  |  | — |
Big Gossan |  | 57 |  |  | 2.30 |  |  | 1.02 |  |  | — |  |  | 2.6 |  |  | 1.3 |  |  | — |
Grasberg open pit |  | 5 |  |  | 1.26 |  |  | 1.98 |  |  | — |  |  | 0.2 |  |  | 0.4 |  |  | — |
Under development: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grasberg Block Cave |  | 963 |  |  | 0.96 |  |  | 0.72 |  |  | — |  |  | 17.2 |  |  | 14.1 |  |  | — |
Undeveloped: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kucing Liar |  | 349 |  |  | 1.24 |  |  | 1.03 |  |  | — |  |  | 8.1 |  |  | 5.2 |  |  | — |
Total 100% basis |  | 18,828 |  |  |  |  |  |  |  |  | 124.0 |  |  | 30.8 |  |  | 3.83 |
Consolidated f |  |  |  |  |  |  |  |  |  | 119.6 |  |  | 30.8 |  |  | 3.78 |
FCX’s equity share g |  |  |  |  |  |  |  |  |  | 86.8 |  |  | 17.0 |  |  | 3.44 |
a. | Excludes material contained in stockpiles.
b. | Includes estimated recoverable metals contained in stockpiles.
c. | Amounts not shown because of rounding.
d. | The Lone Star oxide project is under development.
e. | Estimated recoverable proven and probable reserves from Indonesia reflect estimates of minerals that can be recovered through 2041. Refer to Note 13 for discussion of PT-FI’s IUPK.
f. | Consolidated reserves represent estimated metal quantities after reduction for joint venture partner interests at the Morenci mine in North America. Refer to Note 3 for further discussion.
g. | Net equity interest reserves represent estimated consolidated metal quantities further reduced for noncontrolling interest ownership. FCX's net equity interest for estimated metal quantities in Indonesia reflects an approximate 81 percent from 2019 through 2022 and 48.76 percent from 2023 through 2041. Refer to Note 3 for further discussion of FCX’s ownership in subsidiaries.

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