Kalamazoo Locks in 15km Gold-Antimony Corridor in Victoria’s Fosterville Belt

Kalamazoo secures 15km structural corridor at province-scale Mt Piper gold-antimony project

Kalamazoo Resources (ASX: KZR) has consolidated a 1,574km² footprint across an underexplored part of Central Victoria, establishing what the company describes as a province-scale gold-antimony exploration position at its Mt Piper project. The catalyst is the granting of two new exploration licences, EL008918 (Seymour) and EL008919 (Hughes Creek), which now deliver continuous coverage over a 15km prospective structural corridor extending through the Whiteheads Hill target area.

The total tenure breaks down to 1,179km² of granted exploration licences and a further 395km² under application, all 100%-controlled by KZR. The project sits within the same highly endowed Victorian geological province that hosts Fosterville (9.4Moz Au), Costerfield (1.2Moz Au, 121kt Sb), Nagambie, and Sunday Creek — each a nearby operating or advanced analogue system rather than a distant comparison. The southern boundary of Mt Piper tenure sits less than 100km from central Melbourne.

What is gold-antimony exploration and why does it matter?

A gold-antimony system is one where gold and antimony occur together in hydrothermal vein systems. Hot, mineralised fluids travel along fault structures deep within the earth, depositing both metals as they cool and react with surrounding rock. The two metals frequently co-occur in high-grade, structurally controlled deposits across Central Victoria.

Antimony carries its own strategic weight beyond simply accompanying gold. The announcement flags antimony’s increasing national significance as a critical mineral, a designation that reflects its role in defence, electronics, and energy applications where supply security has become a policy priority.

KZR is targeting what geologists call “epizonal” mineralisation, essentially the Fosterville and Costerfield style of deposit. Epizonal means high-grade gold-antimony mineralisation formed at shallow crustal depths, close to the surface at the time of formation, often characterised by visible quartz veining and well-defined structural controls.

Securing continuous tenure along a fault corridor matters because fault structures act as pathways for those mineralising fluids. A 15km unbroken corridor gives KZR the ability to test the entire system in a coordinated, company-led programme rather than working around gaps in tenure or competing ownership.

Early drilling validates the Whiteheads Hill corridor — three prospects in focus

The first-pass aircore programme at Whiteheads Hill has confirmed in-situ gold-antimony anomalism associated with a west-dipping structure. That result validates the corridor as a real hydrothermal system, not merely a surface geochemical signal, though the company is clear that all results remain early-stage and sub-economic at this point.

Three active prospects are now in focus across the broader project area:

1. Whiteheads Hill — A 15-hole aircore programme totalling 328m returned peak results of up to 155ppm Sb and 68ppb Au, with a 3m zone exceeding 100ppm Sb within a broader anomalous interval of approximately 40m. A total of 452 soil samples have been collected and analysed. Mineralisation is interpreted along the contact between the Norton Gully Sandstone and Monty’s Hut Formation, and the prospect sits approximately 20km south of the Nagambie Sb-Au mine.

2. Cunninghams — Soil geochemistry has confirmed a gold-antimony-arsenic response of up to 27ppm Sb and 45ppb Au, linking known mineralisation with historic alluvial workings. Historical hard rock workings at the prospect have been reported to have returned up to 21 g/t Au and +1% Sb according to Oroya Mining historical reports (these are historical figures sourced from Oroya Mining Limited, not KZR-verified resource estimates). The prospect is located 14km north of the Sunday Creek project.

3. Kurkuruk — Reconnaissance rock chip sampling confirmed mineralisation over at least 670m of strike, with peak assays of 3.2 g/t Au, 1,428ppm Sb, and 1,949ppm As. The prospect hosts historical shafts within strongly veined metasediments and last operated in the early 1940s. A soil programme is planned to further inform drill design.

All intercepts and results quoted are down-hole lengths. True widths are not known at this stage.

The table below summarises selected standout holes from the Whiteheads Hill aircore programme (Table 1 in the source announcement). All figures are verified directly from that table.

All intercepts are down-hole lengths. True widths are not known. Results from 3m composite samples unless noted as (1m).

Exploration Director Ben Ackerman

“These early reconnaissance results affirm our view that Mt Piper represents a much broader regional opportunity rather than a collection of isolated prospects. Securing and expanding this tenure gives us a significant opportunity to systematically explore for new high-grade gold and gold-antimony deposits in a region with clear geological analogues to major Victorian systems including Fosterville, Costerfield, Nagambie and Sunday Creek. With continuous tenure now secured over this 15km corridor, we can apply a systematic combination of geophysics, geochemistry and structural interpretation to identify the strongest positions for follow-up drilling…”

Systematic exploration blueprint — what comes next

With tenure secured and early results validating the system, KZR’s next phase is designed to progressively reduce the large search area into a ranked pipeline of high-conviction drill targets. Planned work includes:

• Remotely sensed hyperspectral imagery
• High-resolution airborne gravity gradiometry
• Progressive geochemistry programmes across known systems
• Structural interpretation integrating all datasets
• Goal: generate a portfolio of prioritised targets for staged drill testing

Exploration is also continuing across KZR’s broader Victorian portfolio in parallel. Drilling at Tarnagulla and Smiths Reef within the South Muckleford project has recently been completed, with results expected in the next quarter.

CEO Andrew McDougall positioned Mt Piper clearly within the company’s wider strategy: “Mt Piper provides Kalamazoo with a meaningful longer-term discovery platform alongside the Company’s primary development focus at Ashburton.”

The Peake exploration target at Ashburton, where KZR recently defined a 310koz resource growth opportunity in the Pilbara, illustrates how the company is building a multi-asset discovery pipeline across distinct geological settings simultaneously.

That primary development asset, the Ashburton Gold Project in the Pilbara (WA), hosts a 1.44Moz resource and remains the company’s leading development priority. Mt Piper sits alongside it as an early-stage, high-optionality discovery platform, one where KZR now controls a 100%-owned, province-scale footprint in a jurisdiction with a well-established track record of producing major gold and gold-antimony systems. Antimony’s critical mineral status adds a strategic dimension to the project that extends beyond gold alone.

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