Argentina Grants Glencore’s MARA Copper Project RIGI Approval

Argentina granted formal RIGI approval to Glencore’s MARA copper project on 2 October 2026, locking in a 30-year guarantee of fiscal, customs, and foreign-exchange stability behind a US$4 billion capital commitment. This is not a feasibility update or a preliminary filing. It is a government endorsement that moves MARA into active pre-construction.

The timing matters. Copper supply analysts at Wood Mackenzie, CRU, Goldman Sachs, and Citi have spent recent years pointing to a structural deficit emerging in the late 2020s and deepening into the 2030s, and Latin American greenfield projects are the primary candidate pool to close it.

MARA is among the largest and earliest of that pool to reach the market. The project targets more than 200,000 tonnes of copper-in-concentrate annually across its first decade, with full operations scheduled for October 2031.

What follows below is the detail that actually matters: what the approval guarantees, what MARA will produce, how Glencore came to own all of it, and where the project now sits on the global supply curve.

Glencore secures 30-year fiscal lock-in for a US$4 billion copper commitment

The headline number is the 30-year stability guarantee, and it is the most consequential part of the approval.

RIGI, created under Argentina’s Law 27.742 as a regime for large, long-term investments, requires each qualifying project to sit inside a sole-purpose vehicle known as a Vehículo de Proyecto Único (VPU). In exchange, the project receives a bundled package of tax, customs, and foreign-exchange terms that cannot be altered for three decades from the approval date.

The RIGI investment framework was designed specifically to address the mismatch between Argentina’s historically volatile policy environment and the multi-decade capital horizons that large mining projects require, offering locked-in terms precisely because no private lender would otherwise commit at scale.

This is not a tax concession. It is a structural change to how the project’s risk can be modelled across its entire operating life.

The specific terms now fixed for MARA are these:

• Corporate income tax of 25%, down from Argentina’s standard 35%
• Accelerated depreciation: movable assets over a minimum of two years, mines over 60% of their normal useful lifespan
• Foreign-exchange stability bundled into the guarantee
• Customs stability bundled into the guarantee
• A 30-year duration on all of the above

Glencore also went well beyond the regime’s minimum entry requirements. RIGI obliges investors to deploy at least 40% of committed capital within the first two years, against a base threshold of US$200 million. Glencore has committed US$771 million over that window, described as nearly ten times the minimum.

That early-deployment figure is the tell. It signals genuine project commitment rather than a speculative approval parked for optionality.

“We are grateful to the national authorities and the Catamarca provincial government for their cooperative engagement throughout this process,” said Martín Pérez de Solay, Chief Executive Officer of Glencore Argentina.

For anyone tracking copper project pipelines, the fiscal terms define MARA’s economic floor. The gap between a 25% and a 35% tax rate across a 27-year mine life is not a margin item; it materially changes the project’s internal rate of return and the amount of debt it can carry. The 30-year lock-in is what lets lenders and equity investors model post-tax cash flows without discounting for Argentine policy reversal.

What MARA will produce, and when the first copper arrives

The legal framework is settled. The physical project is what the approval now sets in motion.

MARA is built on a resource base of approximately 1.2 billion tonnes at an average grade of 0.47% Cu. From that, Glencore projects more than 200,000 tonnes of copper-in-concentrate annually across the first operating decade, over a total mine life of 27 years.

The project’s defining feature is that it does not start from nothing. MARA will process ore through the existing Alumbrera plant, located roughly 35 km from the Agua Rica pit. Reusing installed processing infrastructure lowers both the capital intensity and the construction risk relative to a fully greenfield build, and that is a meaningful detail for anyone modelling execution uncertainty.

From approval to first copper: the key dates

The path to production runs in a clear sequence:

1. H2 2027: Alumbrera restart and enabling works, representing first production activity
2. November 2027: Main construction begins
3. October 2031: Full MARA operations

That October 2031 date is the strategically significant one. It places MARA’s full output almost exactly in the window where supply-deficit projections turn most acute, which makes the development timeline consequential rather than incidental.

For investors, the Alumbrera reuse shortens the development runway and reduces first-production risk, both of which feed directly into how much execution uncertainty you should price into the project before first metal arrives.

How Glencore came to own 100% of MARA, and why the consolidation matters

Full ownership did not happen by accident. It was a three-year sequence of deliberate acquisitions, and that sequence is what made this approval possible in the form it took.

Major mining consolidation activity in 2026 has run alongside the greenfield investment push, as the same capital constraints and critical minerals demand that motivate RIGI approvals also drive tier-one miners to acquire rather than build where existing resources can be absorbed faster than a decade-long development cycle allows.

MARA itself emerged from a December 2020 consolidation that paired the Minera Alumbrera processing plant with the Agua Rica development asset, establishing the infrastructure-plus-resource structure that still defines the project. The name reflects that pairing.

The original owner was a three-party joint venture: Yamana Gold, Glencore, and Newmont. Glencore’s path to control then unfolded in two steps. In October 2022 it bought Newmont’s 18.75% stake, lifting itself to 43.75%. In July 2023, after Pan American Silver had absorbed Yamana’s majority position earlier that year, Glencore acquired that remaining 56.25% and reached 100%.

The consolidation was the prerequisite for the approval. RIGI’s single-vehicle VPU structure works cleanly with one owner, and Glencore’s position let the submission proceed without joint-venture complexity to resolve first.

For anyone assessing execution risk, that clean control removes the partner-alignment friction that often slows or reshapes large mining projects, particularly when regulatory filings and multi-billion-dollar commitments demand unanimous sign-off. The read here is that Glencore was positioning for this regulatory pathway years before taking full control.

Argentina’s copper ambitions and what MARA means for global supply

MARA is not a standalone bet. It is one node in a far larger pipeline that Argentina has been assembling.

At PDAC 2026, the country presented six mining projects already approved under RIGI and twelve more under evaluation, a combined mining investment pipeline of roughly US$47 billion. RIGI is the institutional centrepiece of that strategy.

Within it, copper forms a distinct cluster. MARA sits alongside El Pachón and Los Azules as a trio carrying combined capital expenditure of approximately US$16 billion, and Glencore holds two of those three (MARA and El Pachón) as central pillars of its Argentine copper strategy.

The demand backdrop is what gives the cluster its weight. Analysts consistently point to a structural copper deficit driven by:

The structural copper deficit that makes MARA’s 2031 start date consequential is not a recent forecast revision; analysts at Wood Mackenzie, CRU, and Goldman Sachs have been tracking its formation for several years, driven by the compounding effect of depleting ore grades at existing mines and a thin greenfield development pipeline.

• Electric vehicles and charging infrastructure
• Renewable energy generation, which is copper-intensive per unit of capacity
• Global transmission and distribution network expansion

These forces underpin the deficit projections from Wood Mackenzie, CRU, the International Copper Study Group, Goldman Sachs, and Citi, all of which see the gap deepening into the early 2030s. Even with every committed brownfield expansion proceeding, projected mined supply falls short of the demand curve, leaving large greenfield projects to close it.

This is where MARA’s October 2031 start date becomes material. Copper projects routinely take more than a decade from early study to production, which means the projects contributing meaningful volume before the mid-2030s are largely those entering serious development now.

For investors tracking the supply pipeline, the approval shifts MARA from project-risk into execution-risk territory. The fiscal and regulatory framework is in place; the remaining variables are construction performance and the copper price.

What the RIGI approval changes, and what execution still requires

The approval resolves a great deal. It does not resolve everything, and the distinction is where informed positioning lives.

What the approval resolves

RIGI has delivered a defined tax structure, accelerated depreciation, customs and foreign-exchange protections, and a 30-year stability guarantee that anchors legal certainty through roughly 2056. Crucially, it carries formal endorsement at both national and Catamarca provincial levels, with the province’s cooperative approval secured as part of the process.

That provincial sign-off is a positive precedent. In Argentina’s federal structure, provinces can effectively veto or reshape projects, so Catamarca’s engagement matters.

What remains to be managed

The structural caveats do not disappear with a signature. Argentina carries a long history of macroeconomic volatility, and the stability regime needs ongoing provincial-level alignment across a multi-decade operating life.

Canning House frames RIGI as additive to an already permissive mining framework, but warns that its benefits remain contingent on the approval of individual provinces. Formal fiscal stability also does not substitute for social licence, which still requires genuine community engagement regardless of what the legal regime guarantees.

The practical read for investors is a change in the dominant risk. MARA has moved from country-risk-dominant to execution-risk-dominant: the question is no longer whether Argentina will honour the framework, but whether Glencore can build to schedule and budget across a four-year construction period. The next concrete marker is the November 2027 construction start.

Execution risk in large mining projects of MARA’s scale typically concentrates in three phases: site enabling and infrastructure mobilisation, peak construction workforce management, and commissioning of processing circuits, each of which has historically generated cost and schedule overruns that eroded the IRR gains that a favourable fiscal regime was designed to deliver.

Treating the approval as a fully de-risked event, rather than a repricing of where the risk now sits, is the difference between informed and uninformed positioning on Glencore’s copper pipeline.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results, and financial projections are subject to market conditions and various risk factors. Forward-looking statements are speculative and subject to change based on market developments and company performance.