Ana Paula’s $1B NPV: Does Heliostar’s Self-Build Thesis Hold?

A junior gold developer with a project carrying a US$1 billion net present value and a 51.3% internal rate of return has three obvious choices: sell the asset to a major, dilute shareholders to build it, or find a third way. Heliostar Metals has picked the third way.

That decision is either a disciplined capital-allocation thesis or a very large bet on operational consistency at two Mexican mines that were sitting idle two years ago. The company intends to build its flagship Ana Paula underground gold project without selling it and without issuing new equity to shareholders.

The timing of this question matters. As of September 2026, the Ana Paula feasibility study is 34% complete, a construction decision is expected by mid-2027, and the financing package has not yet been fully assembled. Investors weighing the stock today are doing so before the feasibility-level economics are locked and before the debt is arranged. That is precisely the point where the gap between the opportunity and the risk is widest.

Here is what the data tells you about whether the thesis holds, where the real risks sit, and which milestones actually determine the outcome. Treat this as a framework for assessing the company on its own terms, not as a recommendation.

What makes Ana Paula’s economics genuinely rare

Start with the numbers, because they carry the argument on their own. The November 2025 underground preliminary economic assessment (PEA) puts annual output at roughly 101,000 oz of gold at an all-in sustaining cost (AISC) of US$1,011/oz. All-in sustaining cost captures the full cost of producing an ounce, including sustaining capital and overheads, so it is the truest measure of a mine’s margin.

Layer on the rest. The resource grade sits at approximately 5.4 g/t, life-of-mine production reaches roughly 874,700 oz over nine years, the internal rate of return lands at 51.3%, and the after-tax net present value comes in near US$1.012 billion on pre-production capital of US$300.1 million.

The technical detail behind these figures is what makes them uncommon. Most high-grade underground deposits are narrow, which forces selective mining and caps throughput. Heliostar and external commentators describe Ana Paula’s high grade as distributed across wide mining intercepts, which opens the door to bulk underground methods with far better productivity per tonne moved.

The capital intensity argument follows from there. Spending US$300.1 million to bring 874,700 oz into production compares favourably with bulk low-grade open pits, which routinely demand roughly twice the capital per ounce while delivering thinner margins.

On paper, Ana Paula generates an after-tax NPV of around US$1 billion on capital of just US$300 million, a return profile that most mid-tier producers would find competitive.

An AISC below US$1,011/oz in the current gold price environment implies margins that fund debt repayment quickly. That single number is what makes everything downstream possible, because it is the figure that determines whether the financing thesis holds together when it is stress-tested.

The self-funding thesis: how Heliostar plans to build without diluting shareholders

The financing architecture is a 50/50 construction, and the elegance is in how the two halves are meant to reinforce each other.

• Internal cash flow: approximately US$150 million generated by the producing La Colorada and San Agustín mines, the equity substitute
• Debt or non-dilutive instruments: approximately US$150 million to cover the remainder
• The structuring principle: no new equity issued to existing shareholders, preserving their stake through construction

That is the distinction from a conventional junior developer. Companies without producing assets typically fund comparable capital through equity raises, streams, or royalties, which means heavy dilution and restrictive covenants. Heliostar is attempting to fund half the build from cash it already generates.

Self-funded expansion models that rely on operating cash flow from producing assets to fund adjacent construction have gained traction among mid-tier developers seeking to avoid the dilution and restrictive covenants that accompany equity raises and royalty streams, though they introduce a hard dependency on operational consistency that pure debt-equity structures do not.

The production base that underpins the equity half

The equity half rests entirely on the two operating mines performing. The trajectory looks like this:

1. 2025 actual: combined output of 34,908 oz AuEq from La Colorada and San Agustín
2. 2026 guidance: 50,000-54,900 oz combined
3. Projected cash flow: approximately US$150 million accumulated at prevailing gold prices, forming the equity-funding contribution
4. Capex timeline: deployed toward the mid-2027 construction decision and beyond

The uplift from 34,908 oz in 2025 to guidance of up to 54,900 oz in 2026 is what makes the US$150 million target credible, but only if that production is delivered and gold prices hold.

Where the debt half comes from, and why it matters

Lenders like projects that repay them fast. A 51.3% IRR and sub-US$1,100/oz AISC mean strong cash flows that clear debt quickly, which reduces the lender’s exposure and improves the terms on offer.

The catch is that the debt has not yet been formally arranged. Project finance packages in the US$200-400 million range typically require a completed feasibility study, a demonstrated operating track record, and permitting progress before terms are confirmed.

That is where the plan concentrates its risk. Any operational shortfall or gold price weakness compresses the equity half, and a weaker equity half worsens the debt terms available for the second half. The two halves are linked, so a problem in one becomes a problem in both.

Feasibility study bankability requirements for senior project debt typically demand Measured and Indicated resources only, a completed feasibility study, and a demonstrable operating track record, conditions that help explain why the debt half of Heliostar’s financing package cannot be formally arranged until the Q2 2027 study is delivered.

The permitting and execution risks that test the thesis

The economics are the case for Ana Paula. Permitting is the set of variables an honest investor has to hold alongside them, and here the evidence points in two directions that do not fully reconcile.

Management’s position, articulated by Stephen Soock of Heliostar, is that the transition from open-pit to underground permitting should not face material obstacles, and that the switch is a technical and economic decision rather than a regulatory one. Independent industry commentary tells a different story about timelines.

Industry observers and legal practitioners generally describe open-pit-to-underground permit transitions in Mexico as multi-year processes, often requiring 18-36 months from formal submission to final approval, depending on project complexity and community dynamics.

Mexico’s 2023 mining law reforms sharpened the regulatory environment for new projects and significant permit modifications. The specific risk categories flagged in industry commentary include:

Mexico’s permitting environment has tightened considerably since the 2023 mining law reforms, with federal agencies applying greater scrutiny to water concessions and environmental impact assessments for projects outside the hydrocarbon sector, a dynamic that adds uncertainty to any developer projecting a 12-15 month window from submission to approval.

• Delays in environmental impact approvals
• Tighter scrutiny of water concessions
• Heightened consultation obligations with ejidos and Indigenous communities
• Greater political sensitivity toward foreign-owned large-scale mining
• Security considerations in certain regions
• Shifting regulatory interpretations under the post-2023 regime

There is a genuine offset. Ana Paula is already permitted as an open pit and carries a pre-existing decline, camp, and surface rights inherited from Argonaut Gold’s earlier investment. That baseline is a meaningful advantage over greenfield permitting, where a developer starts from nothing.

Comparable cases temper the optimism. Torex Gold’s Media Luna underground project and expansions at Los Filos show that even established operators face protracted permitting and social-licence negotiations across federal and state layers.

The timeline is where the tension becomes concrete. The feasibility study is targeted for Q2 2027, a construction decision for mid-2027, and first commercial production for H2 2028. That leaves a compressed 12-15 month window to complete permitting, arrange financing, and begin early construction. Whether that is credible given Mexico’s current regulatory posture is the judgement each investor has to make, and it is the variable most likely to move the whole schedule.

Building a mid-tier producer: what the 500,000-ounce ambition requires

Ana Paula is the flagship, but it is not the whole strategy. Heliostar’s stated ambition is roughly 500,000 oz per year by the end of the decade, and the arithmetic behind that number reveals where the real work lies.

Organic capacity across the existing portfolio tops out near 300,000 oz per year. The gap to the 500,000 oz target is therefore roughly 200,000 oz per year, and management intends to fill it through acquisitions and further growth initiatives.

That gap is a separate execution risk from Ana Paula itself. Reaching the headline target requires repeating the kind of distressed-asset acquisition that delivered the Mexican mines in the first place, executed at attractive prices, which is not guaranteed.

Management frames itself as a team of mine builders and operators rather than asset vendors, and characterises building rather than selling as an increasingly uncommon stance in the junior sector. The near-term signposts management points investors toward run in a clear sequence:

1. Quarterly financial results demonstrating cash accumulation and balance-sheet strength
2. Drilling results across the portfolio, including the Goldstrike antimony asset in Utah
3. Feasibility study delivery in Q2 2027
4. A construction decision by mid-2027, followed by first production in H2 2028

What this tells you is that the full valuation upside is a story about management’s capacity to keep acquiring. The question worth asking is whether that acquisition optionality is already priced into the stock or still sitting on the table.

What the data tells you before the feasibility study lands

The investment case reduces to three variables that all have to hold at the same time. If they do, the self-funding thesis is credible. If one slips, it drags on the others.

Pricing execution risk in junior developers requires separating the quality of the underlying asset from the probability that the management team delivers on schedule, because the market often prices both as a single discount when a project transitions from PEA to feasibility and then to construction decision.

• Operational consistency at the producing mines: La Colorada and San Agustín must keep delivering, because they fund the roughly US$150 million equity half.
• Permitting progress on schedule: the underground approvals need to land inside the compressed window to the H2 2028 production target.
• Gold prices sustaining cash-flow assumptions: the projected internal cash flow is priced at prevailing metal prices, so weakness compresses the equity contribution and the debt terms behind it.

The interdependence is the single most important thing the data tells you right now. Investors buying today are pricing in a thesis that needs all three conditions to hold across an 18-24 month window.

The Q2 2027 feasibility study is the next major re-rating event. It will either confirm or revise the current PEA base, and the after-tax NPV near US$1.012 billion is the figure to watch against whatever the feasibility work produces. The permitting update embedded in that delivery will be the clearest read on whether the construction timeline is real.

The feasibility study economics that will land in Q2 2027 carry significant weight here: the after-tax NPV near US$1.012 billion and the 51.3% IRR are PEA-level figures, and feasibility-level work routinely revises both capex and resource assumptions in ways that can tighten or widen the margin considerably.

Track the sequence in order: the next quarterly financials for cash build, the Q2 2027 feasibility delivery, then the mid-2027 construction decision.

One last point. By choosing to build rather than sell, management has explicitly closed off the near-term takeover premium some investors would prefer. This is a longer-duration, execution-dependent thesis by design.

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. Financial projections are subject to market conditions and various risk factors, and forward-looking statements are speculative and subject to change based on market developments and company performance.