Red Mountain Mining Ltd (ASX:RMX) Confirms Antimony Vein System at Its Armidale Project
26 September 2025
Price Sensitive Announcement $
Highlights:
• Antimony mineral Stibnite, confirmed at both Oaky Creek North and Oaky Creek
South with multiple veins reported locally and interpreted extensions along strike
• Inferred Antimony System strike length of over 1km at Oaky Creek North
• Armidale Project covers 392km2 within Australia’s premier Antimony Province with Red Mountain planning further exploration across multiple underexplored zones
• Soil and Rock assay results are expected to be received by the Company shortly
Overview:
Red Mountain Mining Limited has announced that Stibnite, the key ore mineral of Antimony, has been visually confirmed across an extensive inferred strike length of over 1km at Red Mountain’s 100%-owned Armidale Antimony- Gold Project in New South Wales.
At both Oaky Creek North and South, coarse-grained stibnite mineralisation has been identified within quartz vein-hosted structures. Interpretation and mapping by Red Mountain’s geological team indicate multiple parallel stibnite vein systems, with structures at Oaky Creek North trending northwest and those at Oaky Creek South trending northeast. The Oaky Creek North alteration system appears to have an inferred strike length over 1km, which the company will confirm by assay results.
Red Mountain interprets that the possible change of orientation between the north and south is due to movement along Namoi Fault, that cuts through the grid with Oaky Creek North residing to the east of the fault and Oaky Creek South residing to the west of the fault.
The sampling program over the Oaky Creek historical Stibnite mines was completed with over 1,000 individual soil and rock chip samples collected. The samples remain at the laboratories of Intertek and are undergoing assay. Full sample location details will be provided when assay results become available.
Red Mountain’s project lies approximately 100km west of Larvotto’s (ASX: LRV) Hillgrove Project and several of Trigg Minerals’ (ASX: TMG) Antimony Projects and extends for 85km immediately west of the Peel Fault.
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.
The geology of the tenement 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.
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