Stockhead - Large antimony system at play with new drilling targets for RMX

Special Report: Red Mountain Mining’s comprehensive auger soil sampling program has identified potential extensions to high-grade antimony mineralisation at the Oaky Creek target area within its Armidale project in NSW.

The second batch of analytical results from the program included a sample assaying up to 28.1% antimony about 600m north-northwest of Oaky Creek South, highlighting the potential for a new extension to the current mineralised system.

Previous conventional and auger soil sampling returned up to 39.3% antimony and 1.09ppm gold, indicating the potential for Oaky Creek to host a large-scale orogenic antimony-gold vein system with a strike extent of about 3km at surface.

Notably, this is analogous to the style of mineralisation at Larvotto Resources’ Hillgrove project, Australia’s largest known antimony deposit.

Red Mountain Mining (ASX:RMX) has also extended a previously identified 200m by 30m antimony-arsenic anomaly near the Oaky Creek South Main grid by a further 30% with values of up to 251ppm antimony and 1443ppm arsenic.

Likewise, soil sampling at the southern end of Oaky Creek North has further supported the NNW-trending antimony anomaly with values of up to 137ppm antimony and 334ppm arsenic.

This aligns with previously identified conventional soil anomaly and mineralised stibnite-bearing rock sampling, providing further evidence for widespread antimony mineralisation at Oaky Creek.

Overview of auger sampling at Oaky Creek. Pic: RMX

Auger soil sampling

The field program carried out in January-February 2026 across Oaky Creek North and Oaky Creek South has returned numerous highly anomalous samples.

Results are pending for a further 900 auger soil samples with assays expected before the end of March.

These results will significantly expand coverage at both Oaky Creek North and Oaky Creek South. They will be used in conjunction with datasets for additional expected orogenic antimony vein targets ahead of planned drill testing in Q2 2026.

RMX adds that newly received assays from sampling completed in late 2025 at the Oaky South Main Grid about 400m north-northwest of the small historical pits and shafts at Oaky Creek South have extended the coherent 200m by 30m anomaly by about 60m to the northeast.

The anomaly remains open in that direction, with analytical results for sampling completed in January and February 2026 pending, making it a priority target for planned drill testing.

Separately, rock chip samples collected during the most recent field program returned strongly anomalous antimony results in the Oaky Creek South area.

This includes a high-grade result of 28.1% antimony that is comparable to other high-grade samples from the area, indicating the antimony vein mineralisation extends further north than previously recognised at Oaky Creek South.

The area surrounding this sample has been auger sampled with assays expected later in the month to support the continued development of drill targets.

Another sample collected from the wall of a shallow pit about 230m northeast of the main cluster of historical workings at Oaky Creek South returned an assay of 0.4% antimony.