Red Mountain Mining Limited (ASX:RMX), a gold and critical minerals exploration and development company with a focus on the United States and Australia, is pleased to announce additional rock chip analyses for samples collected at three prospects within the Company's 100% owned Armidale antimony-gold project (EL9732) in the Southern New England Orogen of northeast New South Wales.
HIGHLIGHTS
- Rock chip sampling of outcropping mineralisation at the Oaky Creek prospect, part of the Armidale Antimony-Gold Project returned further strong results highlighted by:
o 36.3% Sb at Oaky Creek North
o 18.8% Sb at Oaky Creek North
o 23.0% Sb and 0.36g/t Au at Oaky Creek South
- Initial rock chip sampling at the previously unsampled East Hills prospect in the south of EL9372 returned a best result of 9.9% Sb, with anomalous samples collected over a strike extent of 70m
- Initial rock chip sampling of the nearby historical Horsley Station gold workings returned up to 0.25g/t Au and evidence of ultramafic lithologies, a preferred host for gold mineralisation along the Peel Fault
- The strong spatial correlation between Antimony and Gold supports RMX's exploration model for the Oaky Creek prospect, targeting a vein-style orogenic antimony-gold deposit, which is considered analogous to Larvotto Resources' (ASX:LRV) Hillgrove project, Australia's largest Antimony deposit
- Evidence of Antimony and Gold mineralisation from multiple prospects across the length of the project highlights the strong potential of the tenement to host multiple orogenic antimony-gold systems associated with the Peel Fault system and its related splays
- The Armidale Antimony-Gold Project comprises a large, strategic tenure covering nearly 400km2 of highly prospective ground, west of Larvotto (ASX:LRV) ($550m market cap)
- RMX well positioned to leverage increased Australian and US Government interest in critical minerals, with Utah Antimony Project exploration set to commence
- Red Mountain continues to assess value accretive critical metals assets in the United States and is progressing its US Stock Market listing, given the significant interest globally in the Company's projects
Analytical results of up to 36.3% Sb and 0.36g/t Au have been received for additional rock chip samples from the Oaky Creek prospect in the northern portion of RMX's tenement (Figure 1*), where the company previously reported antimony in soils results of up to 333ppm Sb and rock chip values of up to 39.3% Sb and 1.09g/t Au . RMX has also collected its initial rock chip samples from the southern portion of the project area (Figure 1*), with 20 samples analysed from the previously unsampled East Hills antimony prospect, with a best result of 9.9% Sb, and eight rock chip samples from the Horsley Station gold prospect recording up 0.25g/t Au.
Further strong results for Oaky Creek
Rock chip sampling at Oaky Creek North and Oaky Creek South was undertaken during the collection of approximately 250 hand auger soil samples spaced at 10m and 20m across the Oaky Creek South prospect (Figures 2 and 3*), following up antimony soil anomalies defined by initial 50m x 100m spaced soil sampling reported in June 2025. Analytical results for the hand auger sampling program are expected to be received before the end of October.
Rock chip samples were analysed at Intertek's Townsville laboratory for Sb, Ag, As and W using sodium peroxide fusion and ICP-MS finish, and for Au using a 50g fire assay charge and ICP-OES finish. All analytical results are listed in Appendix 1*, and gold and antimony results are shown in Figures 2 and 3*.
Eight new samples were collected from the Oaky Creek North area, from both the immediate surroundings of the historical workings and from the antimony bearing creek exposure ~500m northnorthwest of the workings. Five of these samples were found to contain >1% Sb (Figure 2B*), with a best value of 36.3% Sb, which is the highest antimony result recorded to date for Oaky Creek North.
A sample of weathered outcrop or subcrop (AAR189, Appendix 1*) collected ~500m northwest of the Oaky Creek South workings contains 23.0% Sb and 0.36g/t Au. This sample is located within 6m of two float samples that were reported on 2 October to contain 39.3% Sb and 0.16g/t Au, and 33.5% Sb and 1.09g/t Au, respectively (Figures 2C and 3C*). The close proximity of in situ mineralisation to the mineralised float samples supports RMX's previous interpretation that the float was collected close to source.
Antimony-mineralisation confirmed at East Hills
As previously reported, RMX has also completed initial soil sampling over the East Hills antimony prospect in the southern portion of EL9732. Results are anticipated before the end of October for a total of 78 soil samples that were collected on a 50m x 100m spaced grid centred on the historical workings at the prospect (Figure 4*). During this program, the company also collected 20 rock chip samples over the prospect (Appendix 1*) and confirmed the presence of high-grade antimony mineralisation, with a best result of 9.9% Sb (Figure 4*). A further two samples with anomalous (>500ppm) antimony were collected ~70m north-northwest along strike from the mineralised sample, indicating that antimony mineralisation at East Hills extends well beyond the small historical workings.
Gold analyses for all samples were low, with a best result of 0.016g/t Au (Appendix 1*).
Anomalous gold and prospective ultramafic host rocks confirmed at Horsley Station
RMX collected eight rock chip samples from the historical workings and nearby outcrops at Horsley Station. A sample of quartz-fuchsite vein material from the workings returned an anomalous gold value of 0.25g/t Au, while a nearby sample of similar material contained anomalous antimony of 0.18% (Figure 5*). An outcrop of ultramafic rock was also sampled ~25m east of the workings (Figure 5*).
Although this sample is not mineralised, ultramafic lithologies are recognised as the preferred host for gold mineralisation along the Peel Fault system and the exposure supports RMX's interpretation that magnetic highs at Horsley Station and Horsley North (Figure 1*) represent structurally bound ultramafic bodies.
Next steps for the Armidale Antimony-Gold Project
Subject to positive results for the pending assays from Oaky Creek South, RMX will undertake a similar program of soil and rock chip sampling over the Oaky Creek North soil anomaly to define prospective drill targets. Further work is also anticipated at East Hills to follow up the initial positive antimony rock chip results, with next steps to be finalised following receipt and interpretation of the results of the soil sampling program.
As previously reported, soil and rock chip sampling is also planned for the Horsley Station and Horsley North gold targets, where land access has now been secured. As reported in August 2025, RMX is also working to secure land access to ground truth stibnite and jarosite spectral anomalies across EL9732, in particular those that lie adjacent to known mineralisation and/or are along the known major Peel, Namoi and Cobbadah faults.
RMX well positioned to leverage increased Australian and US Government interest in critical minerals
Presently, about 90% of global antimony production is controlled by China, Russia, and Tajikistan, which is creating significant supply risks for Western nations such as Australia and the US, where it the metal is a critical component for armament manufacture. With China's export ban creating acute supply shortages and antimony prices recently reaching US$60,000 per tonne, the US Government has issued emergency declarations and mobilised unprecedented funding for domestic production.
RMX has responded to this opportunity through the acquisition of three highly prospective antimonygold projects in Utah and Idaho, USA. Following a recent successful $1.5M placement, the Company is well funded and intends to apply the funds raised to accelerate exploration and development across its U.S. Critical Minerals and Australian gold-antimony projects, with exploration at the Utah Antimony Project set to commence.
RMX Armidale Antimony-Gold Project Background
RMX's 100%-owned Armidale antimony-gold project (EL9372) lies approximately 85km west of Australia's largest known antimony deposit, Larvotto's (ASX:LRV) Hillgrove deposit, which is also the 8th largest antimony deposit globally.
LRV recently announced that plant upgrade works have commenced at Hillgrove. Plant construction is expected to be completed by the end of Quarter 2, 2026. At full capacity, Hillgrove is expected to deliver 40,500 ounces of gold and 4,878 tonnes of antimony, annually, making it a globally significant antimony producer.
The Southern New England Orogen is recognised as Australia's premier Antimony province (Figure 6*).
Antimony occurs in hydrothermal quartz veins, breccias and stockworks, often with associated gold and/or tungsten mineralisation.
EL9732 extends for 85km along the western side of the Peel Fault. The geology of the project area is dominated by isoclinally folded Carboniferous metasediments of the Tamworth Belt, which is a forearc basinal package related to west-dipping subduction of oceanic crust beneath the Lachlan Orogen.
Ultramafic melanges of the Great Serpentinite Belt, which outcrop along the Peel Fault, are considered to be remnants of this oceanic crust. The Peel Fault System has recognised world-class mineral potential, with over 400 known orogenic gold and base metal mineral occurrences along its over 400km strike extent, but is underexplored, with less than 200 mostly shallow drillholes over its length, the majority of which are focused on discrete prospects.
*To view tables and figures, please visit:
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