Challenger Gold Targets 2027 Build at $1.1B Hualilán Project

Challenger Gold has put a price on the first phase of one of Argentina’s largest undeveloped high-grade gold projects. The Hualilán gold project in San Juan province now carries a Phase 1 capital commitment of approximately US$232 million, a 2027 construction mobilisation target, and a development sequence already underway: the company poured its first doré just two months ago. Backed by a pre-feasibility study (PFS) estimating a post-tax net present value (NPV) of approximately US$1.1 billion and a pre-tax internal rate of return (IRR) of roughly 45%, the commitment moves Hualilán from study-phase economics into an active development pathway. What follows is a full account of the project’s economics, its ore body and processing design, the staged timeline from toll milling to standalone production, and the regulatory and financing conditions that must be met before ground is broken.

What Challenger Gold just committed to at Hualilán

The headline figure is US$232 million in Phase 1 start-up capital, excluding contingency. That number represents a 13% reduction from prior cost estimates, a cut the company has framed as optimisation of near-term cash flow rather than a scaling back of the project’s ambitions.

Phase 1 is only the opening chapter. The full lifecycle investment is estimated at US$604 million, covering the construction and operation of an integrated open-pit mine and on-site processing hub over an approximately 14.25-year mine life.

The capital stack in summary:

• Phase 1 start-up capital: approximately US$232 million (excluding contingency), 13% below prior estimates
• Total lifecycle investment: US$604 million
• Current cash position: approximately US$60 million following board renewal

The gap between the Phase 1 commitment and the company’s available cash defines the financing task ahead and shapes every question that follows about execution risk.

PFS economics that underpin the investment case

The PFS production profile gives the financial returns their foundation. Hualilán is estimated to produce 1.84 Moz of gold equivalent (AuEq) over approximately 14.25 years, with average annual output of roughly 135,000 oz AuEq across 12 years following ramp-up. In years one and two, production is forecast above 105,000 oz AuEq per year before climbing to the steady-state profile.

At a gold price assumption of US$3,500/oz, those production figures generate estimated post-tax NPV of approximately US$1.1 billion and a pre-tax IRR of approximately 45%. The payback period, the metric most relevant to anyone assessing financing risk, sits at roughly 2.25 years from first production.

Those numbers look compelling on paper. The question the rest of this article addresses is what sits between the PFS and construction.

How Hualilán works as a mine: the ore body and processing plan

Hualilán hosts a Mineral Resource Estimate (MRE) of 2.8 Moz AuEq, reported under JORC 2012 standards in March 2023. Within that total sits a high-grade core of 1.6 Moz at 5.0 g/t AuEq, a grade profile that distinguishes the deposit from lower-grade bulk tonnage operations.

Mining grade is the single most important variable separating high-value deposits from bulk tonnage operations, and Hualilán’s 5.0 g/t AuEq high-grade core sits well above the threshold that typically justifies the capital intensity of a standalone processing facility.

• Total MRE: 2.8 Moz AuEq (March 2023, JORC 2012 compliant)
• High-grade core: 1.6 Moz at 5.0 g/t AuEq
• Resource confidence: over 75% in the Indicated category, supported by approximately 220,000 m of company drilling

A resource with more than three-quarters classified as Indicated reduces geological uncertainty relative to earlier-stage peers. That confidence level is what allowed the PFS to progress to the capital commitment stage.

The JORC 2012 resource classification standards define the Indicated category as requiring sufficient drilling density and data quality for reasonable assumptions of geological and grade continuity, which is the confidence threshold that underpins mine planning and economic evaluation at the PFS stage.

From open pit to doré: the processing flowsheet

The PFS outlines a truck-and-shovel open-pit operation feeding a dual-circuit processing system. A 1.5 Mtpa flotation-leach plant handles higher-grade material, while an 8 Mtpa heap-leach facility processes lower-grade ore. The flotation-leach circuit, which involves grinding ore and using chemical processes to separate valuable metals, works alongside the heap-leach method, where crushed rock is stacked on pads and irrigated with solution to extract gold over time.

This dual-circuit configuration allows ore to be routed to the most efficient processing path based on grade, adding operational flexibility. The outputs are doré (a semi-pure gold alloy) and zinc concentrate, distinguishing Hualilán from single-product gold operations and providing a secondary revenue stream.

The project sits approximately 120-125 km northwest of San Juan City, accessible year-round via sealed highway.

The path from toll milling today to standalone production in 2029

Challenger Gold is already producing gold. The company is not waiting for 2029 to generate revenue; it is trucking ore from Hualilán to Austral Gold’s Casposo plant under a toll-milling agreement that commenced earlier this year. First doré was poured in June 2026.

Toll-milling strategies have become a common bridge mechanism for junior developers seeking early cash flow before on-site processing infrastructure is commissioned, with the approach allowing companies to validate ore body performance and generate revenue simultaneously.

The development sequence reads as three deliberate stages:

1. Toll milling (current): Processing up to 150,000 t/year at Casposo, with 450,000 t locked in over three years, generating early cash flow and validating the ore body at commercial scale
2. Construction mobilisation (2027): Subject to completion of engineering, permitting, and financing milestones, with concurrent pre-construction work including engineering design, mine plan refinement, early procurement, and long lead-time equipment planning
3. Standalone on-site production (early 2029): Full operation of the integrated flotation-leach and heap-leach circuits on site

The toll-milling bridge serves multiple purposes. Cash flow from Casposo is expected to help fund pre-stripping and early construction work. More importantly, commercial-scale ore processing demonstrates operational capability and ore body performance before the company commits the bulk of its Phase 1 capital.

The staged approach is designed to de-risk the project incrementally, with each phase generating data and revenue that inform the next.

Regulatory approvals and financing: what must go right before 2027

Several conditions have already been met. Hualilán received Environmental Impact Assessment (EIA) approval covering 19 mining rights, clearing the path to sectoral permits and construction activities.

Conditions met:

• EIA approval granted, covering 19 mining rights
• Toll-milling agreement operational, first doré produced

Conditions outstanding:

• Sectoral permits and additional regulatory frameworks beyond EIA
• Formal approval under Argentina’s Incentive Regime for Large Investments (RIGI), a federal programme aimed at stabilising taxes and incentives for major projects; Challenger is pursuing approval, though formal confirmation is not yet detailed in PFS documentation
• Project financing to bridge the gap between US$232 million Phase 1 capital and approximately US$60 million in current cash

The EIA approval is a genuine de-risking milestone. The distance between environmental clearance and construction finance, however, is where most large mining projects encounter their longest delays. Sectoral permits and RIGI status are the critical near-term indicators to track.

The broader shift in Argentina financing conditions for mining projects has gained momentum recently, with export credit agencies reopening lines of credit that were previously unavailable to developers operating in the country.

What the Hualilán commitment signals for Argentina’s gold sector

Hualilán is described as one of the largest undeveloped high-grade gold projects in Argentina and is set to become the first gold mine to enter production in San Juan province in 17 years. That timeline gives the project significance beyond Challenger Gold’s own portfolio.

Argentina’s RIGI regime is a policy mechanism designed to attract and stabilise large-scale foreign investment across resource sectors. Whether Hualilán secures formal RIGI benefits could influence appetite for a broader pipeline of Argentine mining projects currently advancing through feasibility stages.

Argentina’s investment incentive frameworks, including both the RIGI regime and newer bilateral arrangements with the United States, are reshaping how foreign capital assesses sovereign risk in the country’s resource sector.

For investors tracking Latin American mining exposure, the near-term watchpoints are specific:

• RIGI approval status for Hualilán
• Sectoral permit progression beyond the EIA milestone
• Financing structure announcements, including any streaming, offtake, or debt arrangements
• Detailed engineering milestones advancing toward bankable feasibility

Hualilán’s development trajectory is a real-time test of whether Argentina’s investment incentive framework can translate into bankable project conditions. The outcome will shape capital flows into the country’s mining sector for years to come.

A US$1.1 billion NPV project that still has ground to cover

The PFS economics are strong: approximately US$1.1 billion in post-tax NPV, a 45% pre-tax IRR, and a sub-2.5-year payback at US$3,500/oz gold. The toll-milling revenue stream already operational at Casposo provides tangible evidence of commercial momentum.

The conditions between this announcement and a 2027 ground-break, however, remain material. RIGI approval, sectoral permits, and the close of a financing package covering the gap between US$232 million in Phase 1 capital and US$60 million in cash will determine whether the construction timeline holds.

Investors may wish to monitor Challenger Gold’s ASX announcements and Argentine regulatory developments for updates on RIGI status and financing progress as the 2027 construction window approaches.

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. Financial projections referenced in this article are based on PFS assumptions and are subject to market conditions, regulatory outcomes, and various risk factors. Past performance does not guarantee future results.