(EnergyAsia, April 5 2011, Tuesday) — Ensham Coal Sales Company of Australia has agreed to a long-term deal to supply coal to Vietnam National Oil and Gas Group (PetroVietnam).A deal was recently reached between Ensham and  PetroVietnam’s coal distribution and import company, PV Coal.Ensham has three 35-year mining licences to exploit an area of 900…