Metlen is unlocking assets worth approximately $3.5 billion through a strategic partnership with multinational giant Rio Tinto, securing a stable bauxite supply and “locked-in” sales for the next decade.
This agreement positions Metlen to expand its role in the international alumina market, particularly within Europe.
As part of this deal, Metlen is activating the extension of its “Alumínio” plant, which will process bauxite sourced from Rio Tinto’s CBG mine in Guinea.
The supply of 14.9 million metric tons of bauxite over 11 years (2027-2037) will support the production of 3.9 million metric tons of alumina, which will then be purchased by Rio Tinto.
This partnership addresses a critical shortage of bauxite, a major challenge in the global alumina market, and strengthens Metlen’s market position.

According to WoodMac estimates, by 2027, Metlen will represent over 25% of Europe’s total alumina production.
The deal also includes technological collaboration between Metlen and Rio Tinto, particularly to drive the transition towards low-carbon aluminium production.
Both companies share a vertically integrated business model and are active in renewable energy, further enhancing their synergy.
Rio Tinto, a leading global producer of bauxite, alumina, and aluminium, operates in key regions including Australia and Guinea.
The company is fully integrated in the aluminium industry, with a presence in 35 countries, employing 57,000 workers.