Resolution Minerals Limited (ASX: RML | OTCQB: RLMLF) (the “Company”) has delivered a compelling update from its Horse Heaven Antimony-Tungsten-Gold-Silver Project in Idaho, USA, unveiling strong evidence of large-scale mineralisation at the Antimony Ridge Project. The latest three-dimensional (3D) modelling highlights a substantial and expanding system of high-grade antimony-silver veins, reinforcing the Project’s strategic importance in the global critical minerals landscape.
The Company continues to position Antimony Ridge as a cornerstone asset in its broader strategy to supply essential metals, including antimony and tungsten, to Western markets amid rising geopolitical and industrial demand.
Figure 1: Horse Heaven Project map showing Golden Gate and Antimony Ridge targets, with the Stibnite Project located 12km to the east (UTM coordinates). [Resolution Minerals]
3D Modelling Confirms Significant Scale and Growth Potential
Recent 3D modelling has mapped an extensive network of mineralised structures across an area measuring approximately 1,000 metres by 700 metres, with a vertical range of up to 250 metres. The modelling incorporates data from historical mining pits, trenches, and recent fieldwork, revealing more than 100 high-grade veins organised into 30 discrete vein swarms, fault breccias, and stockworks.
These structures form en echelon clusters, indicating a consistent and repeatable mineralisation pattern across the project area.
The CEO of US Operations, Craig Lindsay, has commented:
“Antimony Ridge hosts an Antimony-Silver vein and vein swarm system comprising high-grade large veins, stacked ‘en echelon’, within a broader system of mineralised stockworks with a total strike length of 1,000m, open-ended in all directions.”
The Company has identified that the system remains open in all directions, highlighting strong exploration upside.
Figure 2: 3D modelling highlights 30 high-grade antimony vein swarms within historic pits, surrounded by a broader low-grade halo, extending across 1,000m × 700m and up to 250m vertically. [Resolution Minerals]
Exceptional High-Grade Results Backed by Historical Mining
Antimony Ridge boasts a rich history of production, having supplied critical materials during World War I, World War II, and the Korean War. Notably, the broader district contributed over 90% of the U.S. antimony supply during World War II.
Recent sampling and historical data confirm exceptional grades:
- Antimony (Sb): 31.7% to 48.7%, averaging 39.2%
- Silver (Ag): Up to 1,420 g/t, averaging 430 g/t
- Gold (Au): Up to 0.92 g/t
These results come from large-volume rock samples, which provide a more representative indication of mineralisation compared to traditional rock chip samples.
In this context, Mr. Lindsay has stated:
“Such is the consistency of the vein frequency and the vein swarms that there is a high probability that future work will uncover more veins and extend the length and width of the vein system. The modelling has revealed significant size potential which demonstrates the strategic importance of Antimony Ridge as a potential source of U.S. domestic antimony supply.”
Extensive Mineralised System with Supporting Halo
Beyond the high-grade veins, the Company has identified a broad halo of lower-grade mineralisation, which significantly enhances the overall scale of the system.
Key characteristics include the following:
- Antimony halo grades: 0.5% to 2% Sb
- Silver halo grades: 5 g/t to 60 g/t Ag
- Widespread veinlets and stockworks surrounding high-grade cores
This halo suggests a large, continuous mineralised system that could support bulk mining approaches in the future.
Figure 3: Topographic map of Antimony Ridge, showcasing high-grade antimony veins in historic pits and trenches, with rock chip results overlaid on a shaded topographic map. [Resolution Minerals]
Metallurgical Test Work and Processing Pathways
The Company has initiated metallurgical test work using a ~100kg mini-bulk sample of high-grade stibnite material. Testing is underway across multiple facilities in Canada and Australia to evaluate both pyrometallurgical and hydrometallurgical processing routes.
Resolution expects to produce antimony trioxide as an end product, which will be submitted for pre-qualification with potential U.S. end users.
This step is critical in advancing the Project toward commercial development and securing downstream partnerships.
FAST-41 Status Accelerates Development Timeline
Antimony Ridge has recently been selected for inclusion in the U.S. FAST-41 Transparency Coverage program. This prestigious designation is reserved for strategically important infrastructure and resource projects and is expected to significantly streamline permitting processes.
The recognition underscores the Project’s importance as a potential domestic source of antimony, a critical metal used in:
- Defence systems
- Energy storage and batteries
- Flame retardants and electronics
Mr. Lindsay quoted the importance of the FAST-41 status for Resolution Minerals:
“FAST-41 selection is a significant step forward for Antimony Ridge and reinforces the strategic importance of this project within the United States.”
Strong Pipeline of Upcoming Exploration Activities
Resolution Minerals has outlined an aggressive exploration and development roadmap for 2026, including:
- Up to 250 drill holes at Antimony Ridge (pending approvals)
- Large-scale bulk sampling program
- Phase 2 drilling at Golden Gate Project:
- Up to 13,700 metres of diamond drilling
- Approximately 45 drill holes
The Company aims to define a maiden Mineral Resource and further expand its critical minerals portfolio within the Horse Heaven Project.
Figure 4: Antimony Ridge showing historic open pits and trenches from WWI, WWII, and the Korean War, along with access roads, displayed in a 3D satellite view looking north-east. [Resolution Minerals]
Tungsten Market Advantage Strengthen Strategic Position
In addition to antimony, Resolution’s broader project includes tungsten, another critical mineral experiencing strong demand growth.
Global tungsten demand continues to rise due to its applications in:
- Aerospace and defence manufacturing
- Electric vehicles and battery technologies
- Industrial tooling and high-performance alloys
Supply constraints, particularly outside China, have intensified the strategic importance of projects like Horse Heaven. Resolution’s access to tungsten stockpiles and planned drilling at Golden Gate further strengthen its exposure to this tightening market.
Investors’ Outlook
Resolution Minerals has rapidly emerged as a high-growth player in the critical mineral sector, underpinned by strong exploration results and favourable market conditions.
Share Price Activity (ASX)
- Last Price: $0.071 [As of 10 April, 12 pm AEST]
- 1 Week: +54.35%
- 1 Month: +86.84%
- 2026 YTD: +44.90%
- 1 Year: +914.29%
- vs Sector (1yr): +860.58%
- vs ASX 200 (1yr): +898.43%
- Market Capitalisation: $148.92 Million
Figure 5: Resolution Minerals’ impressive share price performance across different timeframes
The Company’s impressive share price performance reflects growing investor confidence in its strategic positioning within the critical minerals space.
With:
- Strong high-grade results
- Expanding scale confirmed by 3D modelling
- Accelerated permitting via FAST-41
- Exposure to both the antimony and tungsten markets
Resolution Minerals is well-placed to capitalise on increasing global demand for secure, Western-aligned supply chains.
As exploration advances and metallurgical results are delivered, the Company is likely to attract further market attention, particularly given the strategic importance of its assets in the United States.
Disclaimer: This editorial has been prepared for informational purposes only and is based on publicly available information released by Resolution Minerals Limited (the Company). It does not constitute financial product advice, investment advice, or a recommendation to buy or sell securities. The content may include forward-looking statements that involve known and unknown risks, uncertainties, and assumptions which may cause actual results to differ materially from expectations. Readers should conduct their own independent research and consult a licensed financial adviser before making any investment decisions. The author and publisher do not accept any liability for any loss arising from the use of this information.
Last modified: April 10, 2026
