Catalyst Metals Grows Trident Gold Reserve 32% to 524koz Backing a Decade of Output
Key Takeaways
- Catalyst Metals has upgraded the Trident Underground Ore Reserve by 32% to 524koz at 4.2g/t Au (Probable), generated from a feasibility-level assessment as at 1 July 2026.
- The prior Reserve stood at 397koz at 5.0g/t Au — the upgrade adds 127koz while the grade dilution reflects inclusion of lower-grade but economically viable material at a 2.0g/t Au cut-off.
- A 448koz Inferred Resource at 4.6g/t Au sits outside the current Reserve and represents the primary infill drilling target, with a historically demonstrated 75% Inferred-to-Indicated conversion rate providing a concrete growth pipeline.
- Underground development is already 250m advanced, first ore is targeted for CY2027, and grade control drilling covering the first 15 months of production has been completed — materially de-risking the ramp-up.
- Catalyst holds A$331 million cash and bullion with zero debt, a group-wide 4.5Moz Resource and 1.5Moz Reserve, and is targeting ±2Moz Reserve and ±200koz annual production across the Plutonic Gold Belt.
Trident Reserve jumps 32% to 524koz, underpinning a decade of production
Catalyst Metals Limited (ASX: CYL) has announced a 32% increase in the Trident Underground Ore Reserve, now standing at 524koz at 4.2g/t Au (Probable) as at 1 July 2026. The Reserve was generated from a feasibility-level assessment, signalling advanced project maturity rather than a preliminary study.
Trident is designed to operate at a steady-state rate of 60–80koz per annum for more than 10 years, and this upgrade is another step toward Catalyst’s targets of a ±2Moz Reserve and ±200koz annual production across the Plutonic Gold Belt.
The full Reserve and Resource breakdown is as follows:
| Classification | Tonnes (Mt) | Grade (g/t Au) | Gold (koz) |
|---|---|---|---|
| Proved Reserve | – | – | – |
| Probable Reserve | 3.9 | 4.2 | 524 |
| Total Reserve | 3.9 | 4.2 | 524 |
| Indicated Resource | 3.1 | 6.3 | 633 |
| Inferred Resource | 3.1 | 4.6 | 448 |
| Total Resource (June 2026) | 6.2 | 5.4 | 1,081 |
The prior Reserve, as published in the 10 September 2025 announcement, stood at 397koz at 5.0g/t Au (as shown in Figure 2 of the current announcement). The 448koz Inferred Resource at 4.6g/t Au sits outside the current Reserve and is not included in the Probable Reserve declaration — a distinction that matters and is explained in the next section.
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What is an Ore Reserve, and why does this upgrade matter?
Understanding the difference between a Mineral Resource and an Ore Reserve is key to reading this announcement correctly.
A Mineral Resource is a concentration of mineralisation with reasonable prospects for eventual economic extraction. It is classified by confidence level:
- Inferred Resource — lowest confidence; limited drilling data, geological continuity is assumed but not confirmed
- Indicated Resource — moderate confidence; sufficient drilling to support mine planning assumptions
- Measured Resource — highest confidence; detailed drilling with tight spacing
An Ore Reserve takes only Indicated or Measured material and applies real-world modifying factors — dilution, mining losses, processing recoveries, costs, and cut-off grades — to determine what is actually economically mineable. The JORC 2012 hierarchy maps across as follows:
- Indicated Resource → Probable Reserve
- Measured Resource → Proved Reserve
Only Indicated material was used for the Trident Reserve. No Inferred material is included — any Inferred tonnes captured within the mine plan were assigned a zero grade and treated as waste.
Why does a feasibility-level study carry more weight than a preliminary or pre-feasibility study? Because it incorporates detailed engineering, independent consultant inputs, geotechnical and hydrological studies, and vendor-quoted costings.
The 448koz Inferred Resource at 4.6g/t Au currently excluded from the Reserve represents a defined infill drilling target. Historically, Trident’s Inferred Resources have converted to Indicated at a rate of approximately 75%. That is a track record, not a projection, and it frames the conversion opportunity as something concrete and drillable rather than speculative.
Trident’s place in the Plutonic Belt growth strategy
Trident is currently the second-largest deposit on the Plutonic Gold Belt, behind Plutonic Main. The Belt currently produces approximately 100koz per annum from three operating mines (Plutonic Main, Plutonic East, and Keillor) at an All-In Sustaining Cost (AISC) of approximately A$2,800/oz.
Catalyst is bringing three new mines into production — Trident Underground, Cinnamon, and Old Highway — each of which will feed the existing, underutilised 2.0Mtpa gravity/CIL processing plant at Plutonic. The Trident Underground will be the fourth mine developed on the Belt and the first underground development at the Trident deposit itself.
The shared infrastructure position is a material advantage. Trident ore will be processed at the Plutonic plant approximately 30km to the south-west, with the Trident workforce utilising the Plutonic camp, accommodation, and airstrip facilities. This significantly reduces the capital intensity of bringing Trident into production.
Underground development is already underway, with 250m of development completed. First ore is expected in CY2027.
The table below summarises the key deposits across the Plutonic Gold Belt, based on data from Figure 2 of the announcement:
| Deposit | Reserve (koz) | Grade (g/t Au) | Resource (koz) | Planned Production Rate |
|---|---|---|---|---|
| Plutonic Main UG | 817 | 2.3 | 2,200 | 85koz pa |
| Trident UG | 397* | 5.0* | 1,100 | 60koz pa (planned) |
| Old Highway OP and UG | 113 | 4.2 | 206 | 35koz pa (planned) |
| Cinnamon Open Pit and UG | 65 | 1.5 | 145 | TBA |
| Plutonic East UG | 36 | 2.5 | 182 | 15koz pa |
| K2 UG | 20 | 4.3 | 81 | 20koz pa (planned) |
*Note: Trident Reserve and grade figures shown in Figure 2 of the announcement reflect the prior Reserve (397koz at 5.0g/t Au, as at September 2025). The updated Reserve of 524koz at 4.2g/t Au is the current figure declared in this announcement.
Reserve growth pipeline: infill drilling to drive further conversion
The forward pathway for Reserve growth at Trident is clearly defined. The 448koz Inferred Resource at 4.6g/t Au is the primary infill drilling target, and the historically demonstrated 75% Inferred-to-Indicated conversion rate provides a reasonable basis for expecting continued Reserve expansion as that drilling advances.
Grade control drilling of the first 15 months of production has already been completed. This is a de-risking step — it gives the company operational flexibility and provides a buffer of drilled stocks ahead of the formal mine plan, which management views as key to managing risk during the ramp-up phase.
Increased drilling density at Trident has already demonstrated grade improvement, observed in both Resource conversion results and grade control drilling outcomes. The Reserve is based on a cut-off grade of 2.0g/t Au, supported by a gold price assumption of A$4,500/oz. The operation generates a positive NPV at a 7% discount rate, with sensitivity analysis confirming the result holds across variations in gold price, total costs, metallurgical recovery, mined grade, and mined tonnes.
Key forward catalysts for the Trident project include:
- Infill drilling to convert the 448koz Inferred Resource to Indicated and subsequently to Reserves
- Continued underground development progress (currently 250m complete)
- First ore production anticipated in CY2027
- Progression toward Catalyst’s group-wide ±2Moz Reserve and ±200koz annual production targets
One important caveat: Catalyst has noted that its September 2025 10-year guidance should be treated as a general guide only. Since that guidance was released, the company has seen changes to permitting timelines, Reserves and Resources, geological understanding, operational factors, and processing capacities. Future guidance updates will reflect these evolving conditions, and the September 2025 figures should not be taken as firm or current production forecasts.
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Company snapshot and capital position
For investors new to the story, Catalyst holds a substantial resource base across the Plutonic Belt and beyond.
- Total Mineral Resource Estimate (MRE): 4.5Moz at 3.3g/t Au
- Total Ore Reserve Estimate (ORE): 1.5Moz at 2.6g/t Au
- Shares on issue: 261 million; Options: 0.1 million; Rights: 11.9 million
- Cash and bullion: A$331 million; Debt: Nil
Beyond the Plutonic Belt, Catalyst controls a processing plant and more than 75km of strike length immediately north of the historic +22Moz Bendigo goldfield in Victoria. A high-grade greenfield resource at 26g/t Au has been delineated there, with further discoveries along strike anticipated. This positions the company with exploration optionality extending well beyond its current Western Australian production base.
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