Red Mountain Mining Limited (ASX: RMX) has delivered a major breakthrough at its Armidale Antimony–Gold Project in New South Wales, releasing a new suite of high-grade antimony results that reinforce the presence of a large, structurally controlled mineral system. The latest soil and auger sampling returned exceptional grades—including a standout 1.36% antimony result—significantly escalating the project’s exploration momentum.
High-Grade Soil Sampling Confirms Major Antimony-Gold System
A recent program at Oaky Creek South produced a peak soil result of 1,200 ppm antimony, with 13 samples surpassing 100 ppm. These grades, paired with previously reported rock chips reaching 39.3% antimony, strongly suggest that Armidale hosts a significant orogenic antimony-gold system comparable in style to Australia’s largest antimony deposits.
The program outlined a continuous 200-metre-long, northeast-trending antimony-arsenic anomaly that remains open to the northeast. This structure appears to be directly connected to major fault splays of the Namoi system, a key regional mineralising control.
Highlight results include:
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Peak soil antimony: 1,200 ppm
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Coherent anomaly: 200 m long, 30 m wide
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High-grade soil samples: 9 exceeding 100 ppm
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Highest auger result: 1.36% antimony
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Associated gold: up to 14 ppb in the peak antimony sample
Arsenic anomalies closely match the antimony trend, with 27 samples above 100 ppm and a maximum of 1,040 ppm. These pathfinder elements further confirm the continuity and intensity of the mineralised system.
Orogenic Antimony-Gold Systems: A High-Value Geological Target
Orogenic deposits are globally important sources of both gold and antimony, forming when mineral-rich hydrothermal fluids migrate along major fault zones during mountain-building events. They are prized for their:
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large strike lengths and depth potential
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structurally driven high-grade shoots
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predictable pathfinder elements such as antimony, arsenic, and tungsten
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vein-style mineralisation favourable for underground and selective open-pit mining
With antimony now classified as a critical mineral due to supply chain constraints, the presence of strong gold-antimony association significantly boosts the project’s economic appeal.
East Hills Adds Further Exploration Upside
Red Mountain’s grid sampling at East Hills identified meaningful antimony anomalies, peaking at 104 ppm near historical workings. Gold assays of 14 ppb and 304 ppb reinforce the metal association seen at Oaky Creek South.
The East Hills anomaly trends NNW and remains open toward the southeast, suggesting considerable expansion potential.
Exploration Program to Fast-Track Drill Target Generation
Backed by strong geological indicators, Red Mountain Mining has planned an intensive program aimed at defining drill-ready targets for the company’s drilling campaign.
Planned exploration includes:
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Extending the Oaky S Main grid toward the Namoi Fault system
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Sampling the corridor between the Main grid and historic workings
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Testing a 1 km-long anomaly stretching from Oaky Creek North
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Completing detailed analysis to select priority drill targets
This strategic approach aims to integrate soil geochemistry, structural mapping, and historical data to identify the highest-potential zones for initial drilling.
Positioned in Australia’s Premier Antimony Corridor
Armidale is located within the New England Orogen, a geological belt hosting Australia’s richest antimony deposits. Key regional advantages include:
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proximity to the Peel Fault System, boasting more than 400 known mineral occurrences
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minimal historical exploration, with fewer than 200 drillholes across the entire structural corridor
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strategic location west of the Hillgrove deposit—Australia’s largest antimony resource
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strong infrastructure in an established mining district
The regional parallels to Hillgrove are particularly noteworthy, especially as the deposit is currently the focus of international takeover interest, emphasising global concern over antimony supply security.
Why Red Mountain Mining Is Gaining Investor Attention
Red Mountain Mining is emerging as a standout junior explorer in the critical minerals and gold sector. The latest Armidale results reinforce several investment catalysts:
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Exceptional grades and scale: soil assays up to 1,200 ppm antimony and rock chips exceeding 39% indicate high-grade potential over substantial strike length.
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Prime geological setting: located in Australia’s premier antimony belt, adjacent to the country’s most significant deposit.
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Exposure to critical minerals: antimony’s strategic importance is rising due to its key role in energy storage, defence, and flame retardants.
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Disciplined exploration strategy: systematic sampling, rapid follow-up, and clearly defined drill timelines strengthen the company’s exploration profile.
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Diversified footprint: the company also maintains antimony-focused projects in Utah and Idaho, offering multiple sources of value creation in the critical minerals sector.
Management Outlook
Company leadership emphasises that the exceptional soil results, combined with earlier world-class rock chip grades, support fast-tracking exploration to define drill sites. With drilling anticipated in the project’s next phase, the Armidale project is set for an active development stage
