(EnergyAsia, October 1 2010, Friday) — Law firm Herbert Smith LLP said it and Indonesia’s Hiswara Bunjamin & Tandjung (HBT) jointly advised Thailand’s largest coal miner, Banpu, on the recent sale of its 8.7% stake in its listed Indonesian subsidiary, PT Indo Tambangraya Megah Tbk (ITMG), for US$400 million.  (US$1=8,970 rupiah). The transaction is…