Chile, Argentina, Bolivia, Peru Cooperate on Strategic Minerals

Chile, Argentina, Bolivia and Peru signed a joint declaration on strategic minerals in Santiago to strengthen regional integration and position the Southern Cone as a reliable, sustainable supplier for the global energy transition. The agreement targets joint access to multilateral technical and financial support and joint research calls involving public and private actors. It affects lithium and copper producers, multilateral lenders, and battery and energy-transition supply chains, while Mexico, holding significant reserves but lacking a comparable regional bloc, remains reliant on a non-binding bilateral framework with the United States.

Chile, Argentina, Bolivia and Peru signed a joint declaration on strategic minerals, aiming to deepen regional integration and position the Southern Cone as a reliable supplier for the global energy transition. The Chilean government announced the agreement following a meeting of representatives from all four countries held in Santiago.

Chile's Minister of Economy and Mining, Daniel Mas, called the declaration a first concrete step toward a lasting alliance, saying the goal is to establish the Southern Cone as the most reliable, sustainable and competitive supplier of strategic minerals in the world. Mas pointed to Chile's existing mining integration treaty with Argentina as proof that bilateral cooperation can accelerate investment, describing it as a model the two countries now hope to extend to Peru and Bolivia.

The four countries, which together hold some of the world's largest reserves of lithium and copper, said the declaration will help them pursue technical and financial backing from multilateral organizations, as well as design joint calls for proposals that would let public and private actors take part in research, innovation and institutional-strengthening projects.

Peru's Minister of Energy and Mines, Guillermo Shinno, said strategic minerals need to become tools for generating more added value, with supply chains reliable enough to help close social and economic gaps in the region. Argentina's mining secretary, Luis Lucero, and Bolivia's deputy minister of mining policy, regulation and oversight, Walter Landívar, also took part in the Santiago meeting. Lucero noted that Argentina will be part of a region producing more than half the world's copper, and argued that a shared long-term vision matters even where individual countries' strategic priorities diverge.

A Region Racing to Lock in Supply Chains

The declaration formalizes a dynamic that has been building for months. Latin America holds roughly 60% of the world's lithium reserves, and the so-called lithium triangle of Argentina, Bolivia and Chile alone accounts for about half of global lithium resources, while Chile and Peru together supply close to 40% of the world's copper. That concentration of reserves has made the Southern Cone a focal point as governments worldwide shift from market-driven sourcing to coordinated industrial strategy for battery metals and energy-transition inputs.

The push for a unified regional bloc also arrives as Latin American producers face pressure to move up the value chain rather than simply export raw ore. Less than 10% of the copper mined across Latin America is processed locally into semi-finished or finished goods, prompting the OECD to urge the region to reform critical-minerals policy so that more processing and refining capacity stays on the continent. Shinno's remarks on turning minerals into instruments of added value echo that same concern.

Mexico Watches from Outside the Bloc

Mexico is notably absent from this declaration, despite holding proven reserves or development potential across at least 13 critical minerals, including lithium, copper, graphite, rare earths and fluorite. Restrictive state control of lithium and an underdeveloped investment framework have pushed foreign capital toward Argentina and Brazil instead, even as global demand for battery and energy-transition materials accelerates.

Mexico has instead pursued its critical-minerals strategy largely through its relationship with Washington. A bilateral US-Mexico Action Plan on Critical Minerals, signed in February, named copper, silver, lithium, graphite and zinc as priorities for joint development between the two countries. However, that framework carries no binding obligations and no attached capital, and Mexico was left out of a separate US$3 billion package the United States committed to minerals partners elsewhere. Mexico was also absent from the list of signatories at the 2026 Critical Minerals Ministerial, even though it attended the gathering.

That contrast underscores the stakes behind Southern Cone declaration. While Chile, Argentina, Bolivia and Peru move to present a unified front to multilateral lenders and private investors, Mexico continues to navigate regulatory uncertainty over how its own mineral reserves fit into North American supply chains, even as demand for the same battery metals, semiconductor inputs and rare earths keeps climbing across the hemisphere.

The timing is not incidental. Governments across the Americas are increasingly treating mineral supply chains as instruments of geopolitical leverage rather than purely commercial arrangements, and a coordinated Southern Cone bloc gives Chile, Argentina, Bolivia and Peru more negotiating weight when courting the financing and technology needed to build out processing capacity at home. For now, the four nations appear to be betting that a shared regional voice will carry more influence with investors and multilateral institutions than each country negotiating alone, a strategy Mexico has yet to fully replicate with its own neighbors in North America.