(EnergyAsia, January 4 2010, Monday) — The Canadian government has approved Petrochina International Investment Company Limited’s purchase of a 60% stake in Calgary-based Athabasca Oil Sands Corporation (AOSC) for C$1.9 billion. (US$1=C$1.05). Industry Minister Tony Clement said he approved the deal after PetroChina and its parent company, PetroChina Company Limited, had agreed to make a…