The Simandou iron ore project in Guinea's Kérouané region is advancing toward first commercial shipments by late 2026, a development that will reshape the seaborne iron ore market over the coming decade. The project is the largest greenfield mining investment in West Africa, with total capital expenditure exceeding $20 billion including the 600-km Transguinéen railway and port infrastructure.
At full capacity of 120 million tonnes per year, Simandou will represent approximately 7% of the global seaborne iron ore market. The ore is high-grade (66-68% Fe), directly competitive with Vale's Carajás fines and Australian premium fines, and will require less processing before blast furnace feed.
Rio Tinto holds a 53% stake in the Simandou mine, with the remaining share controlled by a Chinese consortium (Chinalco, Baowu, and a Singapore-based joint venture) and the Guinean government. Baowu has committed to offtaking 15-20 million tonnes per year from the Chinese consortium's share, guaranteeing a captive demand base.
The immediate impact on iron ore pricing is nuanced. Simandou's high-grade ore will compete in the premium segment, potentially compressing the premium spread for high-grade over mid-grade (62% Fe). The incremental supply will add downward pressure on benchmark pricing, but the impact will be phased over 3-5 years rather than disruptive in 2026.
Simandou is a medium-term structural bearish signal for iron ore. First shipments in late 2026 are symbolic rather than market-moving — the first 10-20M mt will test the logistics chain. Full production by 2029-2030 is when pricing pressure mounts. Begin planning now for long-term contract renegotiations that account for a seaborne market with 120M mt of additional premium-grade supply.