CBA Aluminium Sale Clears Brazil Antitrust Review as Chalco and Rio Tinto Gain Control

CBA

CBA aluminium sale has cleared Brazil’s antitrust review after Cade approved the transaction with no restrictions. The decision allows China’s Aluminum Corporation, Chalco, and Rio Tinto to move closer to closing their acquisition of a 68.6% controlling stake in Brazilian aluminium producer CBA.

The CBA aluminium sale is strategically important because CBA is Brazil’s last remaining domestic aluminium producer. The company became especially significant after Vale sold its aluminium assets to Hydro in 2016, leaving CBA as the country’s main integrated aluminium platform.

The deal is valued at R4.69 billion, or about $900 million. Chalco and Rio Tinto also plan a tender offer to jointly acquire the remaining shares. Cade’s approval removes the last major regulatory hurdle before closing.

Integrated Aluminium Assets Give the Deal Industrial Weight

CBA operates across the full aluminium value chain. Its platform includes bauxite mining, alumina refining, primary aluminium smelting, downstream processing, recycled aluminium production, and associated power supply.

This integrated structure gives the transaction more strategic value than a simple equity acquisition. Chalco and Rio Tinto are gaining exposure to upstream raw materials, refining capacity, smelting assets, fabrication capability, and recycling operations in one company.

CBA currently operates three producing bauxite mines with combined output of about 2mn t/yr. It also has 800,000 t/yr of alumina capacity, 430,000 t/yr of primary aluminium smelting capacity, and 215,000 t/yr of downstream processing capacity.

Brazil’s Aluminium Chain Enters a New Ownership Phase

The CBA aluminium sale could reshape Brazil’s aluminium industry by bringing two major global players deeper into the country’s industrial base. Chalco adds Chinese aluminium scale and market reach, while Rio Tinto brings global mining and aluminium experience.

Brazil’s development bank Bndes has also approved R715.9mn in funding to upgrade an aluminium production unit in São Paulo. That support suggests Brazil still sees aluminium as an industrial priority, even as ownership becomes more international.

For Brazil, the key issue will be whether the new ownership structure strengthens local production, investment, and downstream competitiveness. For global aluminium markets, the transaction reinforces the value of integrated assets at a time when bauxite, alumina, power, recycling, and low-carbon production routes are becoming increasingly strategic.

The Metalnomist Commentary

The CBA transaction shows that integrated aluminium assets remain highly valuable in a fragmented global supply chain. Brazil keeps the industrial base, but future competitiveness will depend on whether new ownership turns scale into investment, modernization, and stronger downstream capacity.