Bullabulling Gold Hits 6.2 Moz With A$2.3B NPV in Maiden PFS

Minerals 260’s Bullabulling Gold Project just posted one of the more significant undeveloped gold resource updates on the ASX this year. The updated Mineral Resource Estimate (MRE), announced on 8 July 2026, lifted the project to 190 Mt at 1.0 g/t Au for 6.2 Moz, a 38% increase over the previous estimate released in December 2025.

That number does not sit in isolation. The resource has near-tripled from approximately 2.3 Moz at acquisition to 6.2 Moz in roughly 15 months, and it now carries institutional backing from Franco-Nevada in the form of an A$220 million funding package. Alongside the updated MRE, a maiden Pre-Feasibility Study (PFS) delivered the project’s first independent economic case: a 19-year mine life, A$2.3 billion post-tax NPV, and a 43% internal rate of return. This is no longer an exploration story. It is a development story with a concrete 2028 production target.

Here is what the numbers confirm about Bullabulling’s development status, what the economics look like at PFS level, and which near-term catalysts carry the most weight for investors watching this stock into Q1 2027.

Resource grows to 6.2 Moz as drilling delivers a near-tripling since acquisition

The headline figure is 190 Mt at 1.0 g/t Au for 6.2 Moz, compliant with the JORC 2012 reporting standard, the Australian code that classifies mineral resources by geological confidence level. That represents an increase of approximately 1.7 Moz, or 38%, over the 4.5 Moz estimate published in December 2025.

The growth trajectory tells you how quickly this project has scaled. At acquisition, the resource stood at approximately 2.3 Moz. Intensive drilling across the five main deposits (Phoenix, Bacchus, Dicksons, Kraken, and Gibraltar) lifted it to 4.5 Moz by December 2025, and then to 6.2 Moz by July 2026. The incremental ounces added between December and July were discovered at a cost of approximately A$12 per ounce, a figure worth measuring against an Australian dollar gold price above A$3,000/oz at the time of writing.

The confidence classification is where the quality signal sits. Of the 6.2 Moz total, 140 Mt at 0.98 g/t Au for 4.4 Moz is classified as Indicated, approximately 71% of the total resource. An Indicated classification means the geological evidence and sampling are sufficient to assume continuity of grade and geology with reasonable confidence. For investors, that 71% weighting means the bulk of the resource has passed the geological confidence threshold required for conversion to reserves through the Definitive Feasibility Study (DFS) process, a materially different risk profile from a resource dominated by lower-confidence Inferred ounces.

The JORC 2012 classification framework divides mineral resources into Inferred, Indicated, and Measured categories based on geological confidence, and a project’s distribution across those categories determines how much of the resource can realistically flow into mine plan reserves through a DFS process.

Managing Director Luke McFadyen stated that drilling conducted over the past 15 months materially enhanced the company’s understanding of the Bullabulling mineral system, and that this improved geological knowledge would be applied across the upcoming exploration and operational readiness phase.

PFS confirms a 19-year mine life and A$2.3 billion post-tax NPV

The maiden PFS, released alongside the updated MRE on 8 July 2026, is the first independent economic validation of the project. It confirms a 19-year mine life based on 5 Mtpa processing throughput, with potential for staged expansion to 7.5 Mtpa. Annual gold production targets approximately 150,000 oz Au at an all-in sustaining cost (AISC) of A$2,520/oz.

Post-tax NPV (5% discount rate): A$2.3 billion | Post-tax IRR: 43%

Those two figures give investors the first concrete valuation reference point for Bullabulling. An AISC of A$2,520/oz positions the project with healthy margins at current gold prices, and the potential staged expansion to 7.5 Mtpa offers a pathway to higher production output without a proportional step-up in operating cost.

Beneath those economics sits the maiden Ore Reserve: 90 Mt at 0.86 g/t Au for 2.5 Moz, classified as Probable. That reserve was built on the December 2025 MRE and achieved an approximately 85% conversion rate from Indicated resources to Probable reserves, which tells you the mine plan is grounded in well-characterised geological material rather than optimistic assumptions about grade continuity. An updated reserve incorporating the July 2026 MRE is planned for release with the DFS in Q1 2027.

For investors evaluating pre-production gold developers, the 43% IRR positions Bullabulling at the higher end of project returns relative to the Western Australian gold development peer group, and the A$2.3 billion NPV provides a framework against which to assess current market capitalisation. These are PFS-level figures, subject to revision through the DFS process.

PFS and DFS economics serve different functions in the capital allocation process: a PFS establishes the project concept and order-of-magnitude financials, while a DFS provides the engineering precision required for a bankable construction decision, and the gap between the two is where project NPVs most commonly move.

Franco-Nevada’s A$220 million backing and the development capital picture

Franco-Nevada’s commitment of A$220 million to Bullabulling, announced in February 2026, is its largest Australian transaction to date. For investors evaluating development-stage risk, that designation carries weight: Franco-Nevada’s due diligence process is rigorous and well-known across the royalty sector, and its willingness to commit capital at this scale signals that an independent tier-one allocator has assessed the project’s risk-reward and found it acceptable.

The package breaks down as follows:

Royalty and streaming structures like the one Franco-Nevada deployed at Bullabulling allow a project company to monetise future production revenue upfront without diluting equity at the project level, a trade-off that typically suits developers with high-confidence resources and a near-term production timeline.

• Total commitment: A$220 million
• Royalty/stream component: A$170 million
• Equity subscription: A$50 million
• Gross royalty at Bullabulling post-transaction: 2.45%
• Designation: Franco-Nevada’s largest Australian transaction to date

Early works and funded runway to the investment decision

Early works commenced in May 2026, ahead of a Final Investment Decision (FID). The programme includes construction of a 400-room accommodation village, long-lead item procurement, and DFS workstreams. Pre-FID capital of A$180 million is being funded from Minerals 260’s existing cash reserves. The company reported a cash position of approximately A$211 million at mid-2026, establishing a fully funded pathway to the Q1 2027 DFS and FID decision point.

That distinction matters. Bullabulling is not waiting on a capital raise or external funding approval to begin its development runway, a separation that differentiates it from many pre-construction projects in the WA gold space.

Drilling pipeline and the catalysts that matter before Q1 2027

The drilling programme now operates on two distinct tracks, and understanding the difference prevents misreading updates as they arrive.

The first track is operational readiness. Phoenix deposit grade-control drilling has reached completion, covering 26,000 metres across two zones within the deposit focused on areas scheduled to feed production in the mine’s opening years. Grade-control work has also advanced at other near-term pits. These are not resource-expansion programmes; they are mining preparation.

Key expansion targets generating news flow

The second track is resource expansion, and three targets carry the most upside potential:

• Kraken-Endeavour corridor: Gold anomalies have been mapped by auger drilling across a zone stretching roughly 1 km to the south-east of Kraken and about 1.1 km along strike towards the Endeavour prospect. First-pass RC drilling on wide spacings is scheduled to cover the ground between the two deposits, and infill work at Endeavour is intended to underpin a potential maiden MRE for that prospect.
• North of Dicksons: A roughly 1 km continuous gold anomaly has been outlined in an area where prior exploration activity was sparse. RC drilling on wide spacings is scheduled to evaluate the target.
• Recently acquired ground: Further auger drilling is planned across newly secured tenure to the north and north-east of the current project boundary, forming part of the company’s work programme across its broader 1,160 km² tenure holding.

Reported intercepts at Endeavour include 16 m at 1.3 g/t Au and 7 m at 2.7 g/t Au, both from 47 m depth. Historical drilling has shown the prospect to share key geological traits with the main Bullabulling deposit, among them stacked mineralised lodes and gold-bearing laterite horizons.

Endeavour is the prospect to watch most closely. Any maiden MRE release would represent incremental upside to the 6.2 Moz base and a discrete ASX catalyst on its own terms.

Key milestones to watch through to mid-2028

The forward milestone sequence: the DFS and FID are both scheduled for completion in the March quarter of CY2027, with an updated Ore Reserve incorporating the July 2026 MRE released alongside. Construction is expected to commence shortly after a positive FID, targeting first gold in H2 CY2028. All forward milestones remain on schedule as of 28 August 2026.

What the July milestones establish and where the risk remains

The July 2026 package, taken together, confirms that Bullabulling has cleared three thresholds that separate a credible development candidate from a resource-stage exploration play:

• Resource scale: 6.2 Moz, with 71% at Indicated confidence
• Economic validation: A$2.3 billion post-tax NPV and 43% IRR at PFS level
• Institutional funding access: A$220 million from Franco-Nevada, the largest Australian transaction in its portfolio

What remains open before a construction commitment:

• DFS completion in Q1 2027: This will either confirm or revise the PFS economics, and the gap between a PFS and DFS is where project economics most commonly shift. The DFS is the next genuinely price-sensitive event.
• FID itself: A positive investment decision is not guaranteed and depends on DFS outcomes.
• Permitting and regulatory pathway: Available disclosures do not detail the permitting status in full; this is an area for investors to monitor as further disclosures emerge.

The late-2028 production target is achievable on the announced timeline if the DFS confirms PFS economics and FID proceeds in Q1 2027. Those conditions have not yet been met.

For investors, the current position is that Bullabulling has compressed the typical development-stage risk profile significantly through the Indicated resource weighting, the ore reserve, and the Franco-Nevada validation. The construction decision remains ahead, and the Q1 2027 DFS is the next data point that will either affirm or reset the valuation case.

ASX gold M&A activity in 2026 has concentrated on projects with multi-million-ounce resources and near-term production timelines, exactly the profile that Franco-Nevada’s involvement and the PFS economics have now confirmed for Bullabulling, placing it within the acquisition candidate universe that major and mid-tier producers actively monitor.

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. PFS-level metrics are subject to revision through the DFS process and should not be treated as a settled valuation floor.