Four South American nations sign strategic minerals pact to reshape global supply chains

Four South American countries have signed a cooperative pact on strategic minerals, marking a formal step toward turning the continent’s vast lithium, copper, and rare earth deposits into a coordinated geopolitical asset rather than a collection of individual mining operations.

The agreement, involving Argentina, Brazil, Chile, and Peru, arrives at a moment when the global scramble for critical minerals has become less about geology and more about alliances.

What the pact actually covers

The deal builds on months of escalating cooperation across the region. Argentina and Chile have been advancing operational protocols for cross-border copper projects under their revived 1997 Mining Integration and Complementation Treaty. That effort alone could unlock $20.7 billion in investments and boost annual copper output by 540,000 tonnes.

Brazil has been building its own parallel track. On August 6, Brazil’s Ministry of Mines and Energy formalized a technical cooperation agreement with the Development Bank of Latin America and the Caribbean, known as CAF. The goal is to study and develop regional integration of critical minerals supply chains across the Mercosur trading bloc and Chile.

Peru rounds out the quartet, with its mining industry associations actively participating in discussions about shared strategies for critical minerals positioning. These conversations were a key topic at the PERUMIN mining symposium in May, where representatives from all four nations explored how to present a unified front to global buyers.

The geopolitical chess match behind the minerals

The US signed supply-chain frameworks with Argentina, Chile, Paraguay, and Peru back in February as part of Washington’s broader push to reduce dependency on Chinese minerals processing. Beijing currently dominates the refining and processing stages for many critical minerals, even when the raw materials originate elsewhere.

The concept driving these agreements is “friend-shoring,” a term that carries real strategic weight. Instead of relying on geopolitical rivals for essential supply chains, nations increasingly want to source from allies or at least neutral partners. Both the US and the EU have adopted policies that incentivize this approach.

The Lithium Triangle, comprising Argentina, Bolivia, and Chile, holds more than 50% of the world’s known lithium reserves. That lithium is essential for the batteries powering everything from electric vehicles to grid-scale energy storage.

What this means for markets and mining investment

Cross-border protocols between Argentina and Chile mean that copper projects straddling the Andes could finally move forward at scale. The $20.7 billion in potential investment tied to these projects represents a pipeline that would transform both nations’ mining output.

Brazil’s involvement through the CAF agreement adds an institutional layer that could accelerate financing for regional projects.

The risk, as always with multilateral agreements in the region, is execution. Argentina’s economic volatility, Brazil’s shifting regulatory landscape, and Peru’s history of mining protests all remain potential friction points.