Guinea has launched an international tender for blocks 1 and 2 of Simandou, giving companies until August 2 to outline their bids, as the country seeks to revive interest in the world’s largest undeveloped iron ore deposit. Guinea’s aspirations to develop Simandou have foundered because of the cost of infrastructure and protracted legal disputes, but strong iron ore prices and the resolution of some of the problems have increased the chances that developers can be found.