The Simandou mine represents one of the largest iron ore reserves in Guinea and in the world. In March 2010, Anglo-Australian corporation Rio Tinto Group and its biggest shareholder, Aluminum Corporation of China Limited (Chinalco), signed a preliminary agreement to develop Rio Tinto's iron ore project. In 2017, the Serious Fraud Office (SFO), Britain's anti-fraud regulator, launched an official investigation into Rio Tinto's business and mining practices in Guinea.