Gulnara Dariiga, 38, drives a truck piled high with coal as she waits to cross the border.

The road from Mongolia's Tavan Tolgoi coal mine to the border crossing at Gashuun Sukhait is 150 miles long. Backups can stretch for miles. Drivers may wait up to seven days in this line.

Otgonduu Khuudeg, 51, and his wife, Tsedendil Dedkhuu, 60, move cows around to better situate them for the morning milking.