Ora Banda Mining (ASX: OBM) has delivered a step-change update to its gold project Economics, lifting total mineral resources at its Davyhurst gold project near Kalgoorlie to 3.57 million ounces and increasing ore reserves by 136% to 555,000 ounces. The Western Australian gold producer says the uplift reflects the impact of recent drilling at the Waihi and Round Dam deposits, and underpins the case for a planned mill expansion at site.

According to public reporting and the source brief, the total Mineral Resource Estimate now stands at 54.8 million tonnes at 2.0 grams per tonne (g/t) gold for 3.57 million ounces — an increase of 1.46 million ounces since July 2025. Total Ore Reserves are now 7.8 million tonnes at 2.2 g/t for 555,000 ounces, more than double the previous reserve base. The combination of resource growth and reserve conversion is one of the more substantive updates from a Goldfields-focused producer in recent months.

What changed at Davyhurst

The largest single contributor to the upgrade is the Round Dam deposit, where the open-pit resource increased 964% to 25.6 million tonnes at 1.6 g/t for 1.33 million ounces — up from approximately 125,000 ounces previously. The scale of that uplift reflects the redefinition of a deposit that had been previously underexplored relative to its broader geological footprint, according to public reporting.

At Waihi, the combined open-pit and underground resource more than doubled to 7.27 million tonnes at 2.1 g/t for 482,000 ounces. Both deposits sit within Ora Banda’s wider Davyhurst landholding, and the company says they are positioned to feed into its planned multi-mine production schedule.

Reserve conversion is the headline metric

For institutional investors and mining analysts, the ore reserve uplift is often the most consequential metric in a Mineral Resource and Ore Reserve update. Reserves are the portion of a resource that is economically and technically mineable; the 136% increase to 555,000 ounces signals that a greater proportion of the resource base now meets the modifying factors for economic extraction, supporting a longer-life production schedule.

Expansion plans: GR Engineering Services to lead

Ora Banda has appointed GR Engineering Services Ltd (ASX: GNG) as preferred contractor for its proposed Davyhurst Expansion Project, which aims to lift processing capacity to 3.0 million tonnes per annum. According to public reporting, the indicative engineering, procurement and construction (EPC) contract carries an estimated value of A$233 million. The decision to advance front-end engineering with a recognised contractor is consistent with the operational scale-up that resource and reserve growth would normally support.

The specific timeline for a final Investment decision, the start of construction and first ore through any expanded plant has not been disclosed in detail in the source brief and should be verified against the company’s ASX disclosures and any associated definitive feasibility study (DFS).

Project context: Davyhurst and the Goldfields

The Davyhurst gold project sits in the historic Goldfields region of Western Australia, north-west of Kalgoorlie. The region is one of the most prolific gold-producing belts in the world and has hosted mining for more than a century. Ora Banda’s landholding includes multiple satellite deposits feeding into a central processing Facility.

The current expansion case is built around Economies of Scale at the mill, near-mine resource growth and the conversion of higher-grade satellite ounces into reserves. With gold prices remaining firm into 2026, Australian producers with growth optionality have come into sharper analyst focus.

Gold price backdrop

According to public reporting through late 2025 and the first half of 2026, gold prices have been supported by central-bank buying, geopolitical uncertainty and persistent Inflation expectations. The supportive price environment improves cut-off grade economics for producers and gives reserve conversion a more comfortable Margin. That said, OBM’s reserves are stated at an internal price assumption that has not been broken out in the source brief; investors should look for the price-deck disclosure that accompanies the full reserve statement.

Capital and funding considerations

A 3.0Mtpa mill expansion with an indicative EPC value around A$233 million is a material commitment for a mid-tier gold producer. Funding strategy — whether through Cash Flow, Debt facilities, Equity raisings or a combination — will be a meaningful driver of OBM’s Capital Structure in the next 12 months. Investors should monitor the company’s next Quarterly Report, any updated All-In Sustaining Cost (AISC) guidance, hedging arrangements and the timing of a possible debt or equity package.

The exact funding plan, AISC guidance for the expanded production base and projected ramp-up profile are not disclosed in the source brief and should be verified through OBM’s ASX announcements.

Why it matters

For Australian gold investors, a 1.46Moz resource uplift combined with a more-than-doubling of reserves at a single project is a significant inventory event. It changes the conversation around Ora Banda from a multi-mine operator constrained by mill capacity to a producer with a credible pathway to scale.

For the broader Goldfields region, the upgrade is another marker of the renewed exploration intensity around historic camps. Round Dam’s near-tenfold jump in ounces is a reminder that even mature districts can deliver material resource growth when drill density and modelling assumptions are revisited.

Key facts

  • Company: Ora Banda Mining Limited (ASX: OBM).
  • Project: Davyhurst Gold Project, near Kalgoorlie, Western Australia.
  • Mineral Resource Estimate: 54.8Mt at 2.0 g/t gold for 3.57Moz (up 1.46Moz since July 2025).
  • Ore Reserves: 7.8Mt at 2.2 g/t for 555koz, up 136%.
  • Round Dam open-pit resource: up 964% to 25.6Mt at 1.6 g/t for 1.33Moz.
  • Waihi combined open-pit and underground resource: more than doubled to 7.27Mt at 2.1 g/t for 482koz.
  • Davyhurst Expansion Project: targeted processing capacity 3.0Mtpa.
  • Preferred EPC contractor: GR Engineering Services Ltd (ASX: GNG).
  • Indicative EPC value: approximately A$233 million.
  • Final investment decision timing and AISC guidance for the expanded base: not disclosed in the source brief.

What investors should watch next

The most immediate catalysts will be the formal Davyhurst expansion study — likely a definitive feasibility study — and the associated capital cost, schedule and funding plan. Ora Banda’s ability to execute on the expansion at or near indicative cost will be a key valuation lever.

Investors should also monitor quarterly production figures, AISC trajectory, hedging policy and any updates to the mineral resource and ore reserve schedule. Drilling at Round Dam and Waihi will likely continue, and incremental updates may further extend mine life or improve grade assumptions.

Balanced risk view

Mining-execution risk is the dominant near-term consideration. Mill expansions can be delayed by EPC contractor scheduling, equipment lead times, water and power infrastructure constraints, and approvals processes.

Funding risk is also material. The indicative A$233 million EPC value is substantial relative to a junior mid-tier Balance Sheet; a mix of cash, debt and equity is plausible, and any equity issuance could dilute existing holders.

Resource-to-reserve conversion assumptions depend on internal gold price decks and modifying factors. A weaker gold price or higher operating costs could reduce reserves in subsequent updates. Operating risk — geotechnical, dilution, grade reconciliation — is also relevant in the multi-mine, satellite-feed configuration.