Oak Flat is sacred land to some Native Americans, but endangered by mine plan

The 6.7-square-mile (17.3 square-kilometer) Oak Flat is a verdant oasis in an arid landscape dotted with towering saguaro cacti, majestic rock spires and sweeping canyons. It is also here that Resolution Copper Mining, a joint subsidiary of British and Australian mining giants, Rio Tinto and BHP, wants to remove layers of rock to extract copper from deep underground.