China Baowu Steel Group has completed its purchase of a stake in the Simandou project in Guinea, as China’s top steelmaker looks to expand its interest in the world’s largest untapped iron ore mine. Baowu bought an undisclosed stake from Winning Consortium Simandou, which owns the two northern blocks of the project, the Chinese steel mill said in a statement on Thursday. The consortium that sold the stake comprises Singapore’s Winning International Group and aluminum maker China Hongqiao Group.