Massive Chinese investment in the Simandou iron ore project has helped strengthen Guinea's economic outlook, contributing to the country's sovereign credit outlook being upgraded to "positive" while maintaining a B+ rating, according to credit rating firm Standard & Poor's.

The latest assessment by S&P noted that one of the world's largest untapped iron ore reserves is boosting export prospects for the West African nation and has begun translating into stronger government finances since its launch in November.

S&P noted that the foreign exchange reserves nearly tripled to $4.1 billion by the end of 2025 while public revenues surged by 46 percent in 2025, driven largely by increased mining receipts as well as reforms aimed at improving tax and customs administration, the company said in a report on Friday.

Djiba Diakite, chief of staff to the president of Guinea and president of the Strategic Committee for Simandou, noted that the B+ rating accompanied by a "Positive" outlook, upgraded from "stable", is strengthening Guinea's position among the best-perceived sovereign issuers on the African continent.

"This upgrade of the outlook sends an important signal to all our economic and financial partners. It confirms the growing attractiveness of Guinea for international investors and the potential of its economy in the coming years under the leadership of President Mamady Doumbouya," Diakite said.

The agency highlighted the exceptional growth prospects of Guinea, with real GDP growth expected to reach nearly 10 percent on average between 2026 and 2029, driven by the ramp-up of the integrated Simandou megaproject, valued at more than $20 billion, the expansion of refining capacity and the implementation of major infrastructure projects.

S&P also emphasized the potential for diversification of the Guinean economy in agro-industry, information and communication technologies and manufacturing.

Diakite said the start of production at Simandou five months ago and inflows of foreign direct investment gives Guinea stronger safety buffers in an uncertain international environment marked by geopolitical tensions in the Middle East and their potential effects on energy prices and supply chains.

S&P noted that Guinea's recent political milestones, including the adoption of a new constitution in September 2025 and the presidential election in December 2025, marked by strong public participation, led to the lifting of the last sanctions by the African Union and Economic Community of West African States (ECOWAS).

"This decision strengthens Guinea's economic prospects at a time when the Simandou 2040 Sustainable and Responsible Socio-Economic Development Program is entering its deployment phase," Diakite said.

"This ambitious emergence plan opens a new cycle of growth and investment for the country. The coming years will allow us to amplify this momentum and sustainably strengthen the foundations of our economy for the benefit of the entire population."

According to the International Monetary Fund and other independent assessments, the project could boost Guinea's GDP by 20 to 30 percent or more within the coming decade.

Unlike previous mining ventures that stopped at raw exports, the first project of its kind in Africa incorporates iron ore mines, a more than 600-kilometer trans-Guinean railway, a new deep-water mineral port in Forecariah and a steel plant dedicated to local ore processing.