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SUPPLEMENTARY MINERAL RESERVE INFORMATION (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016
 
Coppera
(billion pounds)
 
Gold
(million ounces)
 
Molybdenum
(billion pounds)
North America
30.4

 
0.3

 
2.31

South America
29.5

 
—

 
0.64

Indonesiab
26.9

 
25.8

 
—

Consolidatedc
86.8

 
26.1

 
2.95

 
 
 
 
 
 
Net equity interestd
70.5

 
23.7

 
2.65

a.
Consolidated recoverable copper reserves included 2.2 billion pounds in leach stockpiles and 1.0 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 281.8 million ounces of silver in North America, South America and Indonesia, which were determined using a long-term average price of $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 226.0 million ounces of silver in North America, South America and Indonesia.
Supplementary Reserve Information at 100% Basis by Location
 
 
Recoverable Proven and Probable Mineral Reserves
 
 
Estimated at December 31, 2016
 
 
 
 
Average Ore Grade
Per Metric Tona
 
Recoverable Proven and
Probable Reservesb
 
 
Orea
(million metric tons)
 
Copper (%)
 
Gold (grams)
 
Molybdenum (%)
 
Copper
(billion pounds)
 
Gold
(million ounces)
 
Molybdenum
(billion pounds)
North America
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Developed and producing:
 
 
 
 
 
 
 
 
 
 
 
 
Morenci
 
3,274

 
0.27
 
—

 
—
c 
12.8

 
—

 
0.15

Sierrita
 
2,434

 
0.23
 
—

c 
0.02
 
10.4

 
0.1

 
1.04

Bagdad
 
1,244

 
0.32
 
—

c 
0.02
 
7.4

 
0.1

 
0.36

Chino
 
226

 
0.47
 
0.02

 
—
c 
2.1

 
0.1

 
0.01

Climax
 
170

 
—
 
—

 
0.15
 
—

 
—

 
0.54

Henderson
 
77

 
—
 
—

 
0.17
 
—

 
—

 
0.25

Safford
 
75

 
0.31
 
—

 
—
 
0.6

 
—

 
—

Tyrone
 
6

 
0.51
 
—

 
—
 
0.2

 
—

 
—

Miami
 
—

 
—
 
—

 
—
 
0.1

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Undeveloped:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cobre
 
86

 
0.34
 
—

 
—
 
0.4

 
—

 
—

South America
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Developed and producing:
 
 
 
 
 
 
 
 
 
 
 
 
Cerro Verde
 
3,673

 
0.37
 
—

 
0.01
 
26.7

 
—

 
0.64

El Abra
 
431

 
0.45
 
—

 
—
 
2.8

 
—

 
—

Indonesiad
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Developed and producing:
 
 
 
 
 
 
 
 
 
 
Deep Mill Level Zone
 
439

 
0.90
 
0.75

 
—
 
7.6

 
8.4

 
—

Deep Ore Zone
 
100

 
0.51
 
0.70

 
—
 
1.0

 
1.8

 
—

Big Gossan
 
60

 
2.19
 
0.97

 
—
 
2.6

 
1.3

 
—

Grasberg open pit
 
56

 
1.26
 
2.11

 
—
 
1.7

 
3.4

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Under development:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Grasberg Block Cave

 
964

 
1.03
 
0.78

 
—
 
18.5

 
15.7

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Undeveloped:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Kucing Liar
 
408

 
1.26
 
1.10

 
—
 
9.7

 
6.7

 
—

Total 100% basis
 
13,723

 
 
 
 
 
 
 
104.6

 
37.6

 
2.99

Consolidatede
 
 
 
 
 
 
 
 
 
86.8

 
26.1

 
2.95

FCX’s equity sharef
 
 
 
 
 
 
 
 
 
70.5

 
23.7

 
2.65

a.
Excludes material contained in stockpiles.
b.
Includes estimated recoverable metals contained in stockpiles.
c.
Amounts not shown because of rounding.
d.
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).
e.
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.
f.
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.