FILE PHOTO: Trucks operate in the open-pit mine of PT Freeport's Grasberg copper and gold mine complex near Timika, in the eastern region of Papua, Indonesia

FILE PHOTO: Trucks operate in the open-pit mine of PT Freeport’s Grasberg copper and gold mine complex near Timika, in the eastern region of Papua, Indonesia

Trucks operate in the open-pit mine of PT Freeport's Grasberg copper and gold mine complex near Timika, in the eastern region of Papua, Indonesia on September 19, 2015 in this photo taken by Antara Foto. Reuters/Muhammad Adimaja/Antara Foto

September 5, 2017 3:12 PM (UTC+8)