sentences:  The West Tsankhi section of the Tavan Tolgoi coal deposit has been in operation since 1967, as a small coal mine.It supplied coal to the Mongolian domestic market, but in August 2011, started exporting coal to China  In 2009 in order to maximize the mine's production, the Mongolian government put the mine up for international companies and consortia.Six companies were shortlisted – Shenhua Group, ArcelorMittal, Kores, Peabody Energy, Vale S.A., Xstrata among others.