Turquoise Hill Resources today announced that Oyu Tolgoi has achieved a significant underground development milestone with the completed sinking of Shaft 5 at a final depth of 1,178 metres. During Q4’17, installation of the shaft exhaust fan commenced and is on target to be finished in early Q2’18.
Jeff Tygesen, Turquoise Hill Chief Executive Officer, said, “Underground development momentum continues to progress with the completed sinking of Shaft 5. Each milestone achieved takes Oyu Tolgoi closer to becoming the world’s third largest copper mine.”

Shaft 5 is 6.7 metres in diameter and will be dedicated to ventilation thereby increasing the capacity for underground activities.