Since 2005, Freeport-McMoRan has sought independent verification of its annual sustainability reports. External assurance of our 2018 WTSD reporting was conducted by Corporate Integrity Ltd. in accordance with the ICMM Sustainable Development Framework Assurance Procedure. Since 2009, site-level external assurance has been completed multiple times at all active mining and metals processing operations. We conduct site-level external assurance at operations at a minimum of once every three years, with annual assurance engagements at PTFI and Cerro Verde. The 2018 Assurance Statement can be found here

External Assurance Reviews Since 2009
Operation Name On-site Review Desktop Review Total Number

Atlantic Copper

3 - 3

Bagdad

4 - 4

Bayway

- 1 1

Cerro Verde

7 - 7

Chino/Cobre

3 - 3
Climax Mine 2 - 2

El Abra

4 1 5

El Paso

2 1 3

Fort Madison

- 2 2
Henderson 2 1 3
Kokkola - 2 2

Miami

3 - 3

Morenci

5 - 5

Norwich

- 1 1

Phoenix Corporate Office

10 - 10

PT Freeport Indonesia

8 - 8

Rotterdam

- 3 3

Safford

4 - 4

Sierrita

4 - 4

Stowmarket

- 3 3

Tyrone

3 - 3