Freeport-McMoRan’s subsidiary, PT Freeport Indonesia (PT-FI), undertook a multi-year AMDAL process (an Environmental & Social Impact Assessment) for approval of its operations in Papua, in compliance with Indonesian regulations...During this AMDAL process, which included significant stakeholder engagement, the current approach and system for tailings management was developed as the best site specific alternative...A subsequent Environmental Risk Assessment (ERA) was commissioned in 1998 to determine if there were any additional risks...a five-year exercise consisting of over 90 scientific studies...[that] included stakeholders and scientists from Indonesia and worldwide...The impacts of the approximate 15 years of PT-FI’s controlled riverine tailings operations have been consistent with the expectations that were established in the AMDAL process, as verified by external audits...