Multiple High Antimony Soil Anomalies Discovered at Armidale

Red Mountain Mining Limited (“RMX” or the “Company”) is pleased to report that Highly Anomalous Antimony soil assays have been confirmed at Oaky Creek, part of RMX’s 100% owned Armidale Antimony-Gold Project. A newly defined south-east trend away from the Oaky Creek North pits has been revealed, additionally a new area near Oaky Creek South has opened where up to 333pm Sb in soil has been discovered. The distribution of Antimony in the soils suggests a network across Oaky Creek, of multiple veins existing over 2.3km along the Namoi Fault and up to 400m from the fault. The supporting rock chip assays are pending and expected to be received by the end of June.

HIGHLIGHTS

• Highly Anomalous Antimony-in-Soil results reveal new target zones beyond known source areas at both Oaky Creek North and Oaky Creek South
• Two New Highly Anomalous areas defined, with assays up to 333ppm Sb in soil
• New Northern Antimony area is potentially a strike extension of Oaky Creek North, ~1km south-east away from the historic pits
• A newly defined Antimony soil trend north of Oaky Creek South also confirms a previously undiscovered trend
• High Gold-in-soil assay result lies in the New Northern Antimony area
• Rock Chip assay results are anticipated to be received by the end of June

Figure 1: Soil antimony assay results for the Oaky Creek area highlighting the Top 3 HighestSoil Antimony assays, and new areas outside the areas of historical shaft/pits. Note some 1gaps in the soil grid are due to culture, roads and creeks.

Red Mountain Widens Antimony Mineralisation at Oaky Creek

Red Mountain is pleased to report that it has discovered a new anomalous antimony target zone, which includes a spot high of 333ppm Sb and located 400m to the north of the Oaky Creek South pits. This new area represents a possible ENE strike similar to the trend at Oaky Creek South.

At Oaky Creek North distribution of antimony suggests a south easterly extension of around 1km with a strong response towards the end of the extension. The area in between is cropped and cultivation may have subdued the surface geochemical response. Local reports indicate historical pits were infilled, and displaced rock piles contained visible stibnite, identified by the onsite geologist (ASX Announcement 30 May 2025).

Antimony-in-soil anomalies also validate the mineralisation at both the historic Oaky Creek North and Oaky Creek South pits, where coarse stibnite was previously extracted by hand from the shafts/pits (Figure 1).

Red Mountain analysed the soils for gold in the Aqua regia multielement suite, although not as sensitive as a Fire Assay technique, encouragingly gold was reported in several areas (refer to Figure 2 for the Gold Heat map). The high gold-in-soil sample lies on strike to the north of the 99ppm Sb soil sample on the Oaky Creek North trend. At Oaky Creek South, gold-in-soil was located just west of the old workings.

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