Spoilt for choice: Red Mountain defines multiple antimony zones at Oaky Creek

Special Report: Red Mountain Mining has plenty of opportunities to uncover the antimony prize at its Armidale project in NSW after early exploration has defined five high-priority drill targets at the Oaky Creek prospect.

New auger soil sampling close to historical workings at Oaky Creek South returned values of over 500ppm antimony, peaking at 1.16% (11,600ppm) antimony and 612ppm arsenic.

On the Oaky Creek South Main Grid, infill and extensional auger sampling of the previously reported coherent northeast trending, ~30m wide antimony-arsenic auger soil anomaly returned further strong results of up to 356ppm antimony and 413ppm arsenic.

This extends the anomaly out to a strike length of 300m that remains open to the northeast.

Red Mountain Mining (ASX:RMX) also reported auger results of up to 3011ppm antimony and 859ppm arsenic at Oaky Creek North and further to the north, highlighting strong anomalies around mapped quartz-carbonate stibnite veins.

A large-scale orogenic antimony-gold vein system with a strike extent of ~3km has now been delineated by these results at Oaky Creek.

Oaky Creek anomalies

Results to date highlight the 300m strike Main Grid anomaly and associated quartz-carbonate-stibnite veins and the Oaky Creek South workings as priority targets for drill testing.

Additionally, anomalous arsenic in auger soil samples at Oaky Creek South appears to form a halo across and surrounding the anomalous antimony, closely associated with vein-style quartz-carbonate-stibnite mineralisation.

Multiple arsenic anomalies remain open at the edges of the current coverage at Oaky Creek South between the historical workings and the Oaky Creek South Main Grid.

Further sampling to the east and west of the current coverage may define additional antimony anomalies that would also be potential drill targets.

At Oaky Creek North, the auger results show narrow, strong antimony-arsenic anomalies related to the main mapped veins at both the ~1.5km conventional soil anomaly and the antimony-bearing creek outcrop.

Initial results from the southern end of the conventional soil anomaly define a coherent north-northwest-trending antimony auger soil anomaly that broadly correlates with earlier conventional soil results and the distribution of mineralised stibnite-bearing rock chip samples.

Results from sampling at the creek outcrop and the Oaky Creek North Workings both extend over a strike length of 100-200m, indicating potential for a significant antimony-bearing orogenic vein system.

 Watch 2025 Wrapped: Red Mountain Mining

Armidale and the road ahead

The broader Armidale project in the Southern New England Orogen (SNEO) in northeastern NSW sits west of Larvotto’s Hillgrove deposit, Australia’s largest known antimony deposit and the world’s eighth largest.

Antimony in the SNEO occurs in hydrothermal quartz veins, breccias and stockworks, often with associated gold and/or tungsten mineralisation.

Armidale has an extensive 85km length along the western side of the Peel Fault, which has over 400 known orogenic gold and base metal mineral occurrences along its over 400km strike extent.

Despite this, the Peel Fault remains underexplored with less than 200 mostly shallow drillholes over its length, the majority of which are focused on discrete prospects.

Preparations are currently being finalised for drilling at Oaky Creek to start in Q2 2026.

Metallurgical test results from the prospect are expected in April while further assays for the Thompson Falls antimony prospect in the US are also due that month.