What Is Red Hill Minerals (ASX:RHI) Testing in the Diamond Drilling Program at the Broken Hill Project?

Sonal Goyal

09 October 2026 12:12 AM AEDT

What Is Red Hill Minerals (ASX:RHI) Testing in the Diamond Drilling Program at the Broken Hill Project?

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Broken Hill style lead-zinc-silver systems are tested with deep diamond drilling guided by geophysics. Red Hill Minerals Limited (ASX:RHI) announced on 5 October 2026 a diamond program at its Broken Hill Project.

Company overview

Red Hill Minerals Limited (ASX:RHI) is a West Perth explorer. Its Broken Hill Project, part of the Curnamona Joint Venture, covers 860 square kilometres in New South Wales, about 30 kilometres north-west of Broken Hill.

The program

A 700 metre diamond hole will test the Furiosa copper-gold target, and a 1,000 metre hole will follow up broad lead-zinc-silver mineralisation intercepted at Dementus in 2025, where a 250 metre downhole interval had anomalous lead and Broken Hill Type textures. Gravity and AMT surveys refined the hole positions.

Furiosa target

Furiosa was identified from geology, historical drilling and geophysics, including an interpreted fault and a conductor. Historical drilling nearby returned 2.6 metres at 5.13% copper and 4.4 g/t gold from 337.6 metres.

About the program design

The program was designed after the completion of high-resolution gravity and audio-magnetotelluric surveys, which improved the structural interpretation of the project area and informed the Placement of both holes. Following the company’s maiden 3,734 metre greenfields diamond program in 2025, which targeted prospective stratigraphic horizons for Broken Hill Type lead-zinc-silver mineralisation, the current program is deliberately narrower, with one planned hole at each target.

The announcement describes the project as having significant potential to host large lead-zinc-silver and copper-gold systems, a statement of potential and not a resource. Mineralisation is known to exist over a large area of the tenements within the Willyama Supergroup.

Considerations for the market

Diamond drilling results are normally released after core is logged, cut and assayed, so geological observations may precede assay data. The company has not provided a schedule for results, and shareholders can expect updates as information becomes available.

Dementus follow-up

The Dementus target was tested in Red Hill’s maiden 2025 program, which intersected a 250 metre downhole interval containing anomalous lead and textures characteristic of a prospective Broken Hill Type lode. Since then, the company completed extensive gravity and AMT surveys to refine the follow-up hole location.

The planned hole is 1,000 metres deep and will follow up the broad lead-zinc-silver mineralisation intercepted last year.

Geophysics and the Curnamona Joint Venture

The Furiosa target was defined using an improved geophysical dataset, including a distinct break in magnetic data within a regional antiform and an AMT conductor coincident with the interpreted fault. The Broken Hill Project forms part of the Curnamona Joint Venture and is largely under-explored because of thick sedimentary cover.

Sector backdrop

The Broken Hill district is a major historic lead-zinc-silver field, and cover limits surface exploration.

Broken Hill is among the world’s largest lead-zinc-silver deposits, and explorers elsewhere in the Curnamona Province search for similar systems under cover. Because outcrop is limited, geophysical methods such as gravity and AMT surveys are central to targeting.

Deep diamond holes are costly, so programs usually comprise few holes designed to answer specific geological questions.

Targets under cover, such as those described here, are drilled only after geophysics narrows the options, because each hole is expensive and tests a small Volume of rock. Companies commonly describe such programs as tests of a model, and the result may either support or reduce confidence in that model.

Risks shareholders should weigh

Only two holes are planned, and Furiosa is untested. Historical intercepts nearby were narrow.

Deep diamond drilling is costly, and results may not confirm models.

The project is a joint venture, with funding obligations.

Drilling confirms or rejects a model, and results from a single hole at each target will not establish a deposit.

Joint venture arrangements affect funding and decision rights, and the announcement does not describe their terms.

What’s next

Red Hill will report assays after drilling. Shareholders may wish to watch for results.

Assay and geological results from the two holes are the next information for shareholders to watch.

FAQs

Q: How much drilling is planned?

A:1,700 metres across two holes.

Q: What are the targets?

A:Furiosa (copper-gold) and Dementus (lead-zinc-silver).

Q: What is the project size?

A:860 square kilometres near Broken Hill.

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