Argentina’s PSJ copper mining restart is emerging as one of the most closely watched developments in the global copper industry, marking a potential turning point for a country long considered rich in mineral resources but structurally underdeveloped in production. As copper demand accelerates worldwide due to electrification, renewable energy expansion, and industrial decarbonisation, the search for new supply hubs outside Chile and Peru is becoming increasingly urgent.
For decades, global copper markets have relied heavily on Chile and Peru, which together account for roughly 40% of global mined copper output. While this concentration has supported global supply stability, it has also introduced significant risks tied to water scarcity, labour disruptions, regulatory shifts, and rising fiscal pressure. As a result, investors and mining companies are increasingly asking where the next major copper-producing jurisdiction in South America could emerge.
Argentina has long stood out as a geological contender. Its Andes region shares the same mineral-rich belt that hosts world-class porphyry copper deposits across neighbouring countries. Yet despite this geological advantage, Argentina’s copper production has remained minimal. The reason is not geology, but a combination of regulatory uncertainty, political instability, and long-standing restrictions on large-scale mining in key provinces.
The PSJ copper project in Mendoza, also known as Cobre Mendocino, is now the clearest attempt yet to break this stagnation and reposition Argentina within the global copper supply chain.
Argentina’s Copper Paradox: Strong Geology, Weak Output
Argentina sits within the highly productive Andean porphyry copper belt, the same geological system responsible for some of the world’s largest copper mines in Chile and Peru. Porphyry deposits are particularly important because they contain large, disseminated mineral systems that are suitable for open-pit, bulk mining operations.
The PSJ deposit in Mendoza province fits this model, offering geological characteristics comparable to major copper developments elsewhere in the region. Argentina’s historical underperformance in copper production is driven by structural constraints rather than geological limitations:
- Fragmented jurisdictional system, where provinces control mining rights independently of the national government, creating inconsistent regulatory conditions.
- Long-standing provincial restrictions, particularly in Mendoza, where open-pit metal mining was effectively banned for more than 20 years.
- Macroeconomic instability, including currency volatility, capital controls, and recurring sovereign debt restructuring, which have raised financing costs for large-scale mining projects.
- Social and environmental sensitivities, including concerns over water usage, glacier protection, and agricultural impacts in key wine-producing regions.
These combined factors have suppressed investment despite strong underlying mineral potential. The PSJ project therefore represents a rare attempt to align geological opportunity with a more workable regulatory framework at a time when global copper supply constraints are intensifying.
Mendoza’s Policy Shift Unlocks a Long-Frozen Copper Province
A defining milestone for the PSJ copper mining restart came in December 2025, when the Mendoza Senate approved the project’s Environmental Impact Statement (EIS). This decision effectively overturned a previous legislative rejection that had stood for approximately 14 years.
Mendoza has historically been one of Argentina’s most restrictive provinces for metallic mining. Opposition was largely rooted in concerns over water contamination, glacier preservation, and the protection of agricultural land in one of the country’s most important wine-producing regions.
The approval signals a significant policy shift. Provincial authorities increasingly view large-scale mining as a potential driver of economic growth, employment, infrastructure development, and royalty generation. This change in stance is central to unlocking the region’s long-dormant copper potential.
Project Overview: A Classic Porphyry Copper Development Model
The PSJ project, marketed as Cobre Mendocino, is designed as a conventional open-pit copper mining operation located in the Andean foothills of Mendoza.
Its processing flowsheet follows the standard model used across major porphyry copper operations:
- Open-pit mining and ore extraction
- Crushing and grinding of ore material
- Solvent extraction and electrowinning (SX-EW) processing
- Production of refined copper cathodes as the final product
The focus on copper cathode production is strategically important. Unlike copper concentrate, which requires additional smelting and refining abroad, cathode is a finished product that can be directly exported or used in industrial applications. This improves value capture and strengthens Argentina’s position in the global copper value chain.
Capital Costs and Institutional Credibility
The estimated capital expenditure for the PSJ project ranges between US$559 million and US$630 million, reflecting evolving engineering studies as the project advances from early feasibility stages toward more detailed design.
Cost variability at this stage is common in mining development, as additional infrastructure requirements, contingency allowances, and technical refinements are incorporated into updated models.
A key signal of increasing institutional confidence is the involvement of RBC Capital Markets as financial adviser. Major international investment banks typically engage only when a project demonstrates sufficient geological certainty, regulatory progress, and commercial viability to support potential financing pathways.
Argentina’s RIGI Framework: A New Investment Model
A critical factor supporting the PSJ copper mining restart is Argentina’s Régimen de Incentivo para Grandes Inversiones (RIGI), introduced in 2024 as part of broader economic reform efforts.
The RIGI framework is designed to reduce the structural risks that have historically discouraged large-scale foreign investment in Argentina, particularly in capital-intensive sectors such as mining.
For projects like PSJ, the framework offers several key advantages:
- Currency stability mechanisms, allowing partial retention of export revenues in foreign currency to reduce exposure to peso volatility.
- Tax and royalty stability guarantees, ensuring fiscal terms remain unchanged over the life of the investment once approved.
- Regulatory predictability, limiting the risk of sudden policy shifts during project execution.
These protections are especially important for project finance lenders, who typically require long-term visibility on cash flows and sovereign risk exposure before committing capital. By applying for RIGI status, PSJ aims to significantly reduce its risk profile and improve financing conditions, positioning the project more competitively within the global copper development pipeline.
A Potential Turning Point for Argentina’s Mining Future
The PSJ copper project in Mendoza represents more than a single mine development. It is a test case for whether Argentina can translate its substantial geological endowment into real production under a more stable and investment-friendly framework.
If successful, the project could mark the beginning of a broader reactivation of Argentina’s copper sector, attracting further exploration and development across the Andean provinces.
In a global market increasingly constrained by declining ore grades, long permitting timelines, and rising demand from electrification trends, new copper supply sources are becoming strategically essential.
