Red Mountain Mining (ASX:RMX) Armidale Antimony-Gold Project Progresses With Several High-Potential Prospects

23 October 2025

Price Sensitive Announcement $

Overview:

RMX Resources Limited (ASX: RMX) has released a pivotal update on its 100%-owned Armidale Antimony-Gold Project, located in the mineral-rich New England Orogen of New South Wales, Australia. The announcement highlights an accelerated exploration program fueled by exceptional high-grade results, strategic funding, and a favorable macro environment for antimony—a critical mineral experiencing a global supply crunch. Below is a detailed breakdown of the announcement, focusing solely on its core content and excluding external commentary from the HotCopper thread.Project Overview

• Location and Tenure: The Armidale Project spans over 100 km² across three tenements (EL6115, ELA6195, and ELA6196), wholly owned by RMX. Situated in the New England Orogen, a region known for its orogenic gold and antimony deposits, the project benefits from historical mining activity and modern exploration potential.
• Mineralization: The project targets high-grade antimony (stibnite) with associated gold, silver, and base metals (e.g., copper, lead, zinc). Mineralization occurs in multiple vein systems, with over 20 historical mine workings indicating a district-scale system.
• Strategic Importance: Antimony is classified as a critical mineral by Australia, the US, and the EU, used in batteries, flame retardants, solar panels, and defense applications (e.g., munitions, night-vision tech). With China, which controls ~60% of global supply, tightening export restrictions in 2024, antimony prices have skyrocketed ~200% year-to-date to over US$20,000 per tonne, creating a prime opportunity for domestic producers like RMX.

Recent Exploration Achievements

• High-Grade Rock Chip Results: Earlier 2024 sampling campaigns delivered standout assays, confirming Armidale’s potential as a high-grade antimony-gold system. Key results include:
  • Watson’s Gully: 32.5% Sb and 10.2 g/t Au, showcasing dual-commodity upside.
  • Other Prospects: Multiple samples exceeding 5% Sb across World’s End, Bakers Gully, Paddys Flat, and additional targets, with associated gold grades up to several grams per tonne.
  • These results rank among the highest-grade antimony hits reported in Australia recently, drawing parallels to projects like Hillgrove’s Kanmantoo mine.
• Geological Mapping and Sampling: Recent fieldwork has expanded the understanding of the project’s mineralized footprint. New outcrops of stibnite-rich veins were identified, and known mineralized zones were extended, particularly at Watson’s Gully and World’s End. This work confirms a robust, multi-vein system with significant strike length and depth potential.
• Historical Context: The project area hosts over 20 historical mines, with past production records indicating high-grade antimony (up to 60% Sb in some workings). Modern exploration leverages these clues to prioritize targets, with RMX applying advanced techniques to unlock previously underexplored areas.

Accelerated Exploration ProgramRMX has shifted into high gear, capitalizing on its exploration success and market tailwinds. Key components of the accelerated program include:

• Q4 2024:
  • Geophysical Surveys: Induced Polarisation (IP) surveys are planned to map subsurface extensions of mineralized veins, refining drill targets. IP is particularly effective for detecting sulphide-rich systems like stibnite.
  • Drilling Permits: RMX is fast-tracking approvals to commence drilling, ensuring compliance with environmental and regulatory requirements.
• Early 2025:
  • Maiden Drilling Campaign: A diamond drilling program will target 3-5 priority prospects (likely Watson’s Gully, World’s End, and others with high-grade surface results). The goal is to delineate mineralized zones and confirm continuity at depth.
• Mid-2025:
  • JORC Resource Estimate: Successful drilling could lead to a maiden JORC-compliant resource estimate, a critical milestone for de-risking the project and attracting investor interest.
• Funding Support: A A$1.5M placement completed in September 2024 provides the financial runway to execute this aggressive timeline. The capital raise reflects strong investor confidence in Armidale’s potential amid the antimony price surge.

Strategic and Market Context

• Macro Tailwinds: The global antimony market is under pressure due to China’s export restrictions, announced in mid-2024, which have tightened supply for Western markets. Australia’s push to secure domestic critical minerals supply aligns with RMX’s strategy, positioning Armidale as a potential cornerstone project.
• Competitive Positioning: Armidale’s high-grade results and district-scale potential draw comparisons to other Australian antimony projects, such as Hillgrove Resources’ Hillgrove mine. However, Armidale’s early-stage status offers significant upside if exploration delivers.

Company Notes:

Leadership Perspective Managing Director Rick Ellis underscored the project’s significance: “The Armidale Project’s exceptional high-grade antimony and gold prospects place RMX at the forefront of Australia’s critical minerals sector. With global demand surging and our exploration yielding outstanding results, we’re accelerating our program to define a resource and deliver value to shareholders as quickly as possible.”

Full ASX Announcement: https://hotcopper.com.au/threads/ann-armidale-antimony-project-advances-with-accelerated-program.8841961/