BHP Billiton today announced approval of a US$437 million (BHP Billiton share) investment to expand the Cerrejon Coal mine in La Guajira, Colombia. BHP Billiton’s investment represents one third of the US$1,311 million expansion to be undertaken by Cerrejon Coal, with joint venture partners Anglo American and Xstrata contributing equal investment in the project. The expansion, known as the P40 Project, will enable Cerrejon Coal’s saleable thermal coal production to increase by 8 million tonnes per annum (mtpa) to approximately 40mtpa.