Workers labor in a repair shop for large machinery at the Oyu Tolgoi copper-gold mine, jointly owned by Rio Tinto Group's Turquoise Hill Resources Ltd. unit and state-owned Erdenes Oyu Tolgoi LLC, in Khanbogd, the South Gobi desert, Mongolia, on Saturday, July 23, 2016. Mongolia exported 817,000 tons of copper concentrate in the first half of the year compared with 663,800 tons a year earlier, an increase of 23.1 percent. Photographer: Taylor Weidman/Bloomberg via Getty Images
