(EnergyAsia, June 7 2011, Tuesday) — Thailand’s largest coal miner, Banpu, is looking to increase the annual production capacity of its Australian unit Centennial Coal to 19.6 million tonnes from around 16 million tonnes now, said chief financial officer Somruedee Chaimongkol.Banpu will invest A$589 million between 2011 and 2015 to develop four new mines and…