By Charles Pitts
**TORONTO : ** First Quantum Minerals is moving to de-risk its massive Taca Taca copper-gold-molybdenum project in Argentina by exploring the sale of a minority stake to strategic partners. The Toronto-based miner has initiated a preliminary process that has reportedly drawn interest from global mining heavyweight Rio Tinto Group and Japanese trading houses Mitsubishi Corp. and Mitsui & Co.
The move comes as First Quantum seeks to bolster its balance sheet following the late 2023 closure of its flagship Cobre Panama mine and as Argentina introduces sweeping investment incentives to attract multi-billion-dollar mining developments. Taca Taca, located in the Puna region of Salta Province, is one of the world’s largest undeveloped copper porphyry deposits, with an estimated initial capital expenditure of $4.23 billion for the first phase of development.
While the sale process is in its early stages and no definitive agreement has been reached, the potential entry of top-tier partners underscores the strategic importance of Taca Taca in the global race for copper supply.
Strategic De-leveraging and Project Financing
First Quantum currently holds a 100% interest in Taca Taca. However, the scale of the project: projected to reach a total investment of $5.25 billion including a second-phase expansion: presents a significant financing hurdle for a company currently navigating a period of financial transition. By bringing in a partner, First Quantum can share the heavy capital burden while retaining operational control and a majority share of the production.
Rio Tinto’s reported interest aligns with its stated goal of aggressively expanding its copper portfolio. The company, which is currently ramping up the Oyu Tolgoi underground mine in Mongolia and pursuing the Resolution Copper project in Arizona, is hungry for large-scale, long-life assets that can feed the energy transition’s growing demand for the red metal.
Meanwhile, Japanese trading firms like Mitsubishi and Mitsui have a long history of taking minority positions in world-class copper mines to secure long-term offtake for Japanese industry. Their participation would likely come with attractive financing packages, potentially backed by Japanese export credit agencies.
Taca Taca: A 35-Year Copper Engine
The Taca Taca project is designed to be a massive open-pit operation. According to an updated NI 43-101 Technical Report, the deposit hosts proven and probable reserves of approximately 1.99 billion tonnes at a grade of 0.42% copper and 0.09 g/t gold.
The development plan follows a phased approach:
- Phase 1: An initial throughput of 40 million tonnes per year (Mtpa), requiring $4.23 billion in capex.
- Phase 2: An expansion to 60 Mtpa starting in the fifth year of operations, with an additional $1.02 billion investment.
At peak production, the mine is expected to produce over 320,000 tonnes of copper annually. Over a projected 35-year mine life, the average production is slated to be around 209,000 tonnes per year. This output would place Taca Taca among the top copper mines globally, contributing roughly 1.5% of the world’s current copper mine supply at its peak.
Argentina’s RIGI Program: The Investment Catalyst
The timing of the stake sale process is closely linked to a shift in Argentina’s regulatory landscape. Under President Javier Milei, the country has introduced the Incentive Regime for Large Investments (RIGI). This program is specifically designed to provide the fiscal and legal stability required for projects with investment horizons exceeding several decades.
For a project like Taca Taca, RIGI offers several critical benefits:
- Fiscal Stability: Guaranteed tax rates for a 30-year period.
- Foreign Exchange Access: Preferential access to currency markets, a historical pain point for miners in Argentina.
- Import Relief: Zero duties on the import of capital goods and machinery needed for construction.
- Accelerated Depreciation: Improved project IRRs through faster tax write-offs of capital expenditures.
First Quantum is currently preparing its formal application for the RIGI program, with the Environmental and Social Impact Assessment (ESIA) for the project expected to be completed in the first half of 2026.
Market Dynamics and Copper Supply Deficits
The industry’s focus on Taca Taca is intensified by a looming structural deficit in the copper market. Analysts predict that as global data center expansion, electric vehicle adoption, and renewable energy grids scale up, the supply of copper will struggle to keep pace.
First Quantum’s economic modeling for Taca Taca assumes a long-term copper price of $4.50/lb. With current spot prices fluctuating but maintaining a strong upward trend, the economics of a $5 billion investment in the Puna region look increasingly attractive to diversified majors who can withstand the “permitting to production” timeline, which targets first copper in the early 2030s.
De-risking and the Path to Construction
Beyond financing, First Quantum is actively de-risking the technical and social aspects of the project. This includes water resource planning in the arid Puna region and community engagement in Salta. In April 2026, the company announced a partnership with the International Finance Corporation (IFC) to ensure the project meets the highest ESG standards: a prerequisite for many Western and Japanese investors.
The project will utilize proven technology similar to First Quantum’s other large-scale operations, such as Sentinel in Zambia and Cobre Panama. The design incorporates large SAG mill trains that allow for the planned expansion from 40 Mtpa to 60 Mtpa with minimal operational disruption.
Market Snapshot: Taca Taca Key Metrics
| Metric | Estimate/Value |
|---|---|
| Total Investment | $5.25 Billion |
| Initial Capex (Phase 1) | $4.23 Billion |
| Peak Copper Production | >320,000 tpa |
| Mine Life | 35 Years |
| Proven & Probable Reserves | 1.99 Billion Tonnes |
| Copper Grade | 0.42% Cu |
| Secondary Commodities | Gold, Molybdenum |
Operational Oversight and Future Outlook
As First Quantum advances the stake sale, the company maintains that Taca Taca is a core pillar of its long-term growth strategy. The project is expected to generate approximately 4,000 jobs during its peak construction phase and 2,000 permanent roles once operational.
While the exploration of a minority stake sale indicates a pragmatic approach to capital allocation, First Quantum’s history of building and operating massive mining complexes suggests it intends to remain the driver of the Taca Taca project. For the province of Salta and the Argentine mining sector at large, the success of this sale process and the subsequent FID (Final Investment Decision) will serve as a bellwether for the country’s ability to compete with neighboring Chile and Peru for global mining capital.
