Production at Simandou started in November 2025. The first ore left Guinea’s southeastern mountains through 657 kilometres of new railway and reached the Morebaya port on the Atlantic coast. The project is operational. That changes the terms of the debate.
For years, the central question around Simandou was whether it would ever produce. That question is answered. The question now is how much of what it produces actually reaches the Guinean state, and under what conditions.
The fiscal projections are substantial. An EITI modelling study published in June 2025 estimates annual government revenues between USD 700 million and USD 1.7 billion before 2035, rising to up to USD 2.7 billion thereafter. The IMF puts Simandou’s contribution at roughly 3.4% of GDP annually through the 2030s, against total mining revenues of 2.2% of GDP in 2022. Guinea’s 2026 budget is already priced around that expectation: USD 7.3 billion, up 18.3% from the previous year, with a 9.5% growth target backed by S&P projections for the 2026-2029 period.
The ownership structure shapes the fiscal equation directly. Blocks 3 and 4 are operated by Rio Tinto alongside China’s Chinalco and the Guinean state through SimFer. Blocks 1 and 2 are controlled by the Winning Consortium, now majority-owned by Baowu Resources following its move from 49% to 51% in January 2026. Chinese capital now dominates both zones. That matters because fiscal outcomes in large extractive projects are not determined by headline tax rates alone. They are shaped by cost recovery provisions, infrastructure agreements, transfer pricing, and the terms under which state equity was negotiated. The government published the Simandou project agreements on 30 December 2025. Publication is a step. Enforcement is another matter.
The structural gap is well documented. Guinea’s tax revenues averaged 12.8% of GDP annually between 2016 and 2023, below the 15% threshold the World Bank considers a minimum for sustained development spending. The issue is not the rate on paper. It is collection capacity against operators with complex cross-border financing structures and long amortisation schedules.
The sovereign wealth fund announced for Q2 2026 sits at the centre of this tension. An initial USD 1 billion capitalisation, a mandate covering education, infrastructure and agriculture, advisory input from Singapore and Saudi Arabia, and a CEO recruitment underway. The ambition is to insulate the budget from commodity price swings while building long-term assets. The governance framework has not been made public. Guinea ranks in the bottom third of Transparency International’s index. A fund without independent oversight and transparent drawdown rules can absorb revenue without directing it.
What the next two years will reveal: whether projected revenues translate into actual state transfers, whether equity participation in both consortiums generates real dividends, and whether the fund’s governance architecture holds once the money starts flowing. Simandou is producing. The fiscal infrastructure to capture that production is still being built.