Red Mountain Mining Ltd
Red Mountain Mining Clears the Runway: Drill Approval Secured and IP Survey Complete at Oaky Creek
Red Mountain Mining (ASX: RMX) has taken two decisive steps forward at its Armidale Antimony-Gold Project in New South Wales, with Red Mountain Mining Oaky Creek drill approval and IP survey results marking a pivotal transition from surface exploration into ground-testing. The company has secured regulatory approval for a 32-hole reverse circulation (RC) drilling program at the Oaky Creek prospect, whilst simultaneously completing an orientation Induced Polarisation (IP) geophysical survey designed to sharpen targeting for deeper mineralisation. With drilling set to commence before the end of this quarter, the company is entering its most consequential exploration phase to date.
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Drilling Approval Unlocks the Next Chapter at Oaky Creek
The NSW Resources Regulator has granted Red Mountain approval to drill up to 32 RC holes to a maximum depth of 300 metres at Oaky Creek. The approved program is built on the back of more than 12 months of systematic surface sampling work, including conventional soil, auger soil, and rock chip campaigns spanning the prospect's ~3km strike extent.
Key features of the approved drilling program include:
- Flexibility in collar positioning — the approval is not fixed to specific collar locations, allowing the team to adjust drill placement in real time as early results come in
- Initial holes planned at 100m–150m depth to confirm continuity of mineralisation from surface, with the 300m maximum available to chase down-dip extensions
- Five high-priority targets defined across Oaky Creek North and Oaky Creek South, anchored by a coherent 300m x 30m antimony-arsenic auger soil anomaly at the Oaky Creek South Main Grid
- Rock chip results from surface have returned values of up to 39.3% Sb and 1.09ppm Au, highlighting the high-grade nature of the mineralised vein system
The program is designed around orogenic antimony-gold vein targets — a style of mineralisation known for meaningful depth continuity, as demonstrated at analogous systems elsewhere in the region.
"The approved drilling approval application does not limit Red Mountain to specific collar locations, allowing the Company the flexibility to adjust drill locations in response to initial results."
— Red Mountain Mining ASX Announcement, 18 May 2026
IP Survey Adds a Powerful Subsurface Lens
Alongside the drilling approval, Red Mountain has completed an orientation IP geophysical survey at Oaky Creek South, executed by Fender Geophysics — the same specialist firm that has conducted gradient array IP (GAIP) surveys at Larvotto Resources' Hillgrove project over the past year.
The survey comprised:
| Survey Component | Detail |
|---|---|
| NW-SE oriented lines | 3 lines, each 1.6km long, spaced 100m apart |
| SW-NE cross line | 1 line, 1.5km long |
| Techniques deployed | Gradient Array IP (GAIP) and Dipole-Dipole IP (DDP) along all lines |
| Completion date | First half of May 2026 |
| Results expected | Prior to end of May 2026 |
The dual-technique approach is deliberate. Dipole-Dipole IP is generally more sensitive in detecting resistivity and chargeability responses from steeply dipping, narrow structures like orogenic antimony veins — however, it is significantly more expensive for large-area coverage.
GAIP, furthermore, offers a cost-effective alternative for broader surveys. By running both simultaneously, Red Mountain is building a direct comparison that could inform the design of a future, more comprehensive IP survey across the full 3km strike of the Oaky Creek prospect.
The survey lines are positioned to cross the Oaky Creek South Main Grid anomaly, the Oaky Creek South Workings, several demagnetised zones visible in magnetic imagery, and the Namoi Fault Splay — the interpreted primary structural control on the orogenic antimony system. Results are expected to assist in targeting drill holes for deeper mineralisation and may reveal previously unrecognised subsurface antimony structures that carry no surface geochemical expression.
Understanding Orogenic Antimony Systems — Why Does Depth Matter?
What Is an Orogenic Antimony-Gold System?
Orogenic mineral systems form during episodes of mountain-building (orogenesis), where deep crustal fluids — carrying dissolved metals such as antimony, gold, arsenic, and tungsten — migrate upward along major fault systems and deposit their metal cargo within fractures and veins as pressure and temperature conditions change.
At Oaky Creek, the mineralisation takes the form of quartz-carbonate-stibnite veins and breccias hosted within tightly folded Carboniferous-age metamorphic rocks, structurally controlled by splays of the regionally significant Namoi Fault.
Why Does Depth Matter for Investors?
Orogenic systems are not confined to the near-surface. They are characterised by continuity at depth — often extending hundreds of metres to over a kilometre vertically. The analogue Hillgrove deposit (owned by Larvotto Resources, ASX: LRV) is known to extend to vertical depths of more than 1km.
Consequently, a positive drill result at Oaky Creek does not simply confirm surface mineralisation — it opens the door to a potentially large, three-dimensional mineralised system. This is a critical consideration when assessing the scale potential of the Red Mountain Mining Oaky Creek drill approval and IP survey results.
Glossary of Key Terms
| Term | Meaning |
|---|---|
| RC Drilling (Reverse Circulation) | A drilling method using a rotating bit that returns rock chips to surface via compressed air — fast, cost-effective, and well-suited to initial resource definition |
| Stibnite | The primary ore mineral of antimony (Sb₂S₃), typically occurring in quartz veins |
| Induced Polarisation (IP) | A geophysical technique that measures the electrical chargeability and resistivity of rocks underground, used to detect sulphide minerals and alteration zones |
| GAIP (Gradient Array IP) | A cost-effective IP configuration suited for broad-area surveys |
| Dipole-Dipole IP (DDP) | A more sensitive IP configuration particularly effective for detecting narrow, steeply dipping structures |
| Orogenic System | A mineral system genetically linked to tectonic plate collision and mountain building |
| Soil Anomaly | A zone where soil samples return elevated metal concentrations, indicating potential buried mineralisation below |
The Oaky Creek System in Context — Scale and Analogy
A central part of the investment case at Oaky Creek is its geological analogy to Larvotto Resources' Hillgrove project — Australia's largest known antimony deposit and the 8th largest antimony deposit globally, located immediately east of Red Mountain's tenure within the same Southern New England Orogen.
| Feature | Oaky Creek (RMX) | Hillgrove (LRV) |
|---|---|---|
| Location | Southern New England Orogen, NSW | Southern New England Orogen, NSW |
| Mineralisation style | Orogenic antimony-gold veins | Orogenic antimony-gold veins |
| Strike extent (surface) | ~3km | Established, with extensions being mapped |
| Peak rock chip grades | Up to 39.3% Sb, 1.09ppm Au | — |
| Known depth extent | Being tested — approval for 300m holes | Exceeds 1km vertical |
| IP survey contractor | Fender Geophysics | Fender Geophysics |
| Market capitalisation | — | ~AU$739 million |
| Drill stage | First RC program commencing this quarter | Advanced |
The use of the same geophysics contractor and the same IP methodology applied at Hillgrove — adapted directly to Oaky Creek's geological setting — reflects a targeted and technically informed approach to exploration.
Upcoming Catalysts and Timeline
Red Mountain is approaching a concentrated period of news flow. Investors should be watching for the following near-term milestones:
| Milestone | Expected Timing |
|---|---|
| IP survey results from Fender Geophysics | Prior to end of May 2026 |
| Pioneer Tungsten Project (Montana) due diligence outcome | Prior to end of May 2026 |
| RC drilling program commencement at Oaky Creek | End of Q2 2026 (this quarter) |
| First RC drill assay results | Following drilling commencement |
| Potential expanded IP survey across full 3km Oaky Creek strike | Subject to orientation survey results |
Each of these represents an independent news catalyst. The IP results will inform drill targeting; the drill program itself will generate assay results capable of confirming — or indeed extending — the surface mineralisation picture built up over the past 12 months.
Financial Position Supports the Exploration Program
Red Mountain has flagged that it is well-funded to execute its planned exploration activities across both its Australian and US critical minerals projects. The company recently completed a capital raising alongside the execution of a Stand-by Facility (subject to shareholder approval), providing a combined ~$4 million in total funding capacity.
This positions the company to advance:
- The Oaky Creek RC drilling program in NSW
- IP survey interpretation and potential expanded geophysics
- Pioneer Tungsten Project due diligence in Montana
- Ongoing work across its broader US critical minerals portfolio, which includes the Utah Antimony Project, Thompson Falls Antimony Project (with rock chip assays of up to 36.5% Sb), and two Idaho antimony projects
The Southern New England Orogen — Australia's Premier Antimony Province
The broader Armidale Antimony-Gold Project is positioned within the Southern New England Orogen (SNEO), recognised as Australia's premier antimony province. The region hosts over 400 known orogenic gold and base metal mineral occurrences along the Peel Fault System's 400km strike extent, yet remains significantly underexplored with less than 200 mostly shallow drill holes across its length.
Red Mountain's 100%-owned project spans 85km along the western side of the Peel Fault. The geology is dominated by isoclinally folded Carboniferous metasediments of the Tamworth Belt, representing a forearc basinal package related to west-dipping subduction. Ultramafic mélanges of the Great Serpentinite Belt, outcropping along the Peel Fault, are considered remnants of this oceanic crust.
The Peel Fault System's world-class mineral potential provides important regional context for the Oaky Creek discovery. Within Red Mountain's tenement alone, furthermore, multiple gold and antimony mineral occurrences have been identified, including the East Hills antimony prospect, Horsley Station gold prospect, and Horsley North magnetic target.
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Why Investors Should Watch Red Mountain Closely
Red Mountain is at an inflection point. A year of methodical, systematic surface exploration at Oaky Creek — more than ~1,300 auger soil samples, multiple rock chip campaigns, and detailed geological mapping — has built a well-defined target package now ready for the drill bit.
The receipt of regulatory approval removes a key logistical hurdle, and the completion of the IP survey adds a subsurface intelligence layer ahead of drilling. In short, the Red Mountain Mining Oaky Creek drill approval and IP survey results represent a convergence of catalysts that rarely align so neatly for a junior explorer.
Several factors combine to make this a compelling situation for investors to monitor:
- High-grade surface results of up to 39.3% Sb provide tangible evidence of a significant orogenic antimony system at surface
- 3km strike extent positions Oaky Creek as a large-scale exploration target, not a small isolated occurrence
- Direct geological and methodological analogy to Hillgrove — Australia's largest known antimony deposit with a market cap of ~$739 million — provides a meaningful reference point for scale potential
- Five defined drill targets mean the initial RC program is focused and purposeful, not speculative
- Flexible drill approval allows the program to follow early results in real time
- Funded position of ~$4 million supports execution without immediate further dilution risk
- Dual news catalysts imminent — IP results and Pioneer Tungsten due diligence both expected before end of May
Key Takeaway:
Red Mountain Mining has assembled a technically robust, well-funded, and regulator-approved exploration program at Oaky Creek — a 3km orogenic antimony-gold system in one of Australia's premier antimony provinces. With drilling set to commence this quarter and IP results imminent, the company is entering its most news-intensive period to date. Investors following the critical minerals space, and antimony in particular, should have RMX firmly on their radar.
Ready to Go Deeper Into the Red Mountain Mining Story?
Red Mountain Mining (ASX: RMX) is entering its most active exploration phase to date at the Oaky Creek Antimony-Gold Project — with a 32-hole RC drilling programme approved, an IP survey completed, and multiple near-term catalysts converging this quarter. For investors seeking direct access to company updates, project details, and the latest announcements as drilling gets underway, head to the Red Mountain Mining Investor Hub to find out more.
