Since 2005, Freeport-McMoRan has sought independent verification of its annual sustainability reports. External assurance of our 2019 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 PT-FI and Cerro Verde. The 2019 Assurance Statement can be found here