Argentina and Chile held new talks on August 27 under their 1997 Mining Integration and Complementation Treaty, revived in July after decades of limited implementation. The governments are seeking rules that let mining companies coordinate infrastructure and resources across the Andes.
The bilateral meeting approved operating protocols for Vicuña, NexoAndino and Filo Sur, projects whose mineral systems cross Argentina’s San Juan province and Chile’s Atacama region. The approval moves administrative work forward, although the governments did not disclose the protocols’ technical details.
Chilean Mining Minister Daniel Mas estimates the framework could unlock more than $20.7 billion of investment and add 540,000 metric tons to annual copper output. Those figures describe potential associated with the project pipeline, not capital already committed or production already under construction.
The economic rationale is shared infrastructure. Argentine deposits near the border could obtain shorter routes to Pacific ports and access services, power, water or logistics connected to Chile’s established copper industry, while Chilean suppliers could gain demand from mines developed on the Argentine side.
The projects do not have identical plans. Vicuña, owned by Lundin Mining and BHP, intends to use desalinated Pacific water but has not said whether it will use Chilean facilities. McEwen Copper’s Los Azules does not plan desalinated water or exports through Chile, although it remains interested in the discussions.
Glencore’s El Pachón is also among the projects expected to benefit, while BHP has not clarified how much existing infrastructure it may use. These differences show that the treaty provides an enabling framework; it does not impose a single logistics or water solution on every mine.
The political push has accelerated under Argentine President Javier Milei and Chilean President José Antonio Kast, but implementation has no fixed timetable. Regulatory alignment, permits, taxation, border procedures and commercial agreements still have to be translated into project-specific decisions.
Argentina has produced no copper since the Alumbrera mine closed in 2018, yet its development pipeline could place it among the ten largest producers by 2030. Achieving that outcome depends on financing, construction, water and energy, commodity prices and execution; the renewed treaty lowers coordination barriers but does not by itself bring a mine online.
