Allen & Overy has advised a subsidiary of China Power Investment Corp. on an alumina mining contract with the Republic of Guinea that is part of a $6 billion project in the West African country.

The state-owned electricity producer is planning a major development in the coastal city of Boffa, including an alumina refinery, deepwater port, and coal-fired power plant. The project will also include a bauxite mine that is expected to produce 4 million tons a year. Bauxite is processed into alumina and then into aluminum.