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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2017
Mineral Industries Disclosures [Abstract] |
Schedule Of Estimated Recoverable Proven And Probable Reserves By Location [Text Block] |
| Recoverable Proven and Probable Mineral Reserves
| Estimated at December 31, 2017
| Copper a (billion pounds) |  | Gold (million ounces) |  | Molybdenum (billion pounds)
North America | 33.5 |  |  | 0.3 |  |  | 2.22 |
South America | 28.1 |  |  | — |  |  | 0.62 |
Indonesia b | 25.1 |  |  | 23.2 |  |  | — |
Consolidated c | 86.7 |  |  | 23.5 |  |  | 2.84 |
Net equity interest d | 71.3 |  |  | 21.3 |  |  | 2.56 |
a. | Consolidated recoverable copper reserves included 2.1 billion pounds in leach stockpiles and 0.7 billion pounds in mill stockpiles.
b. | Recoverable proven and probable reserves reflect estimates of minerals that can be recovered through the end of 2041 (refer to Note 13 for discussion of PT-FI’s COW).
c. | Consolidated reserves represent estimated metal quantities after reduction for joint venture partner interests at the Morenci mine in North America and the Grasberg minerals district in Indonesia (refer to Note 3 for further discussion of FCX’s joint ventures). Excluded from the table above were FCX’s estimated recoverable proven and probable reserves of 273.4 million ounces of silver, which were determined using $15 per ounce.
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). Excluded from the table above were FCX’s estimated recoverable proven and probable reserves of 218.2 million ounces of silver.
Supplementary Reserve Information at 100% Basis by Location |
|  | Recoverable Proven and Probable Mineral Reserves
|  | Estimated at December 31, 2017
|  |  |  | 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 |  | 3,134 |  |  | 0.26 |  |  | — |  |  | — |  | c | 11.8 |  |  | — |  |  | 0.14 |
Sierrita |  | 2,245 |  |  | 0.23 |  |  | — |  | c | 0.03 |  |  | 9.9 |  |  | 0.1 |  |  | 1.01 |
Bagdad |  | 1,405 |  |  | 0.31 |  |  | — |  | c | 0.02 |  |  | 7.5 |  |  | 0.1 |  |  | 0.36 |
Safford, including Lone Star d |  | 662 |  |  | 0.45 |  |  | — |  |  | — |  |  | 5.0 |  |  | — |  |  | — |
Chino, including Cobre d |  | 276 |  |  | 0.46 |  |  | 0.02 |  |  | — |  | c | 2.4 |  |  | 0.1 |  |  | 0.01 |
Climax |  | 160 |  |  | — |  |  | — |  |  | 0.15 |  |  | — |  |  | — |  |  | 0.50 |
Henderson |  | 74 |  |  | — |  |  | — |  |  | 0.17 |  |  | — |  |  | — |  |  | 0.24 |
Tyrone |  | 9 |  |  | 0.42 |  |  | — |  |  | — |  |  | 0.1 |  |  | — |  |  | — |
Miami |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.1 |  |  | — |  |  | — |
South America |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed and producing: |  |  |  |  |  |  |  |  |  |  |  |
Cerro Verde |  | 3,577 |  |  | 0.37 |  |  | — |  |  | 0.01 |  |  | 25.6 |  |  | — |  |  | 0.62 |
El Abra |  | 394 |  |  | 0.44 |  |  | — |  |  | — |  |  | 2.5 |  |  | — |  |  | — |
Indonesia e |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed and producing: |  |  |  |  |  |  |  |  |  |
Deep Mill Level Zone |  | 437 |  |  | 0.91 |  |  | 0.76 |  |  | — |  |  | 7.7 |  |  | 8.5 |  |  | — |
Deep Ore Zone |  | 79 |  |  | 0.54 |  |  | 0.76 |  |  | — |  |  | 0.9 |  |  | 1.6 |  |  | — |
Big Gossan |  | 58 |  |  | 2.22 |  |  | 0.93 |  |  | — |  |  | 2.6 |  |  | 1.2 |  |  | — |
Grasberg open pit |  | 34 |  |  | 1.29 |  |  | 2.64 |  |  | — |  |  | 1.1 |  |  | 2.7 |  |  | — |
Under development: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grasberg Block Cave |  | 963 |  |  | 1.01 |  |  | 0.72 |  |  | — |  |  | 18.1 |  |  | 14.5 |  |  | — |
Undeveloped: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kucing Liar |  | 360 |  |  | 1.25 |  |  | 1.07 |  |  | — |  |  | 8.4 |  |  | 5.4 |  |  | — |
Total 100% basis |  | 13,867 |  |  |  |  |  |  |  |  | 103.7 |  |  | 34.2 |  |  | 2.88 |
Consolidated f |  |  |  |  |  |  |  |  |  | 86.7 |  |  | 23.5 |  |  | 2.84 |
FCX’s equity share g |  |  |  |  |  |  |  |  |  | 71.3 |  |  | 21.3 |  |  | 2.56 |
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, and the Cobre ore body is undeveloped.
e. | Recoverable proven and probable reserves reflect estimates of minerals that can be recovered through the end of 2041 (refer to Note 13 for discussion of PT-FI’s COW).
f. | Consolidated reserves represent estimated metal quantities after reduction for joint venture partner interests at the Morenci mine in North America and the Grasberg minerals district in Indonesia. Refer to Note 3 for further discussion of FCX’s joint ventures.
g. | 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.

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