FILE PHOTO: An industry tour group walks inside the Codelco El Teniente copper mine, the world’s largest underground copper mine near Machali area, Rancagua, Chile October 15, 2020. REUTERS/Fabian Cambero
FILE PHOTO: An industry tour group walks inside the Codelco El Teniente copper mine, the world’s largest underground copper mine near Machali area, Rancagua, Chile October 15, 2020. REUTERS/Fabian Cambero