Resolution Minerals Horse Heaven Project Reports 48.7% Antimony Discovery

The Resolution Minerals Horse Heaven project has delivered some of the highest antimony grades ever reported at surface, with recent sampling at the Antimony Ridge Mine returning spectacular results of 48.7% antimony and 890 g/t silver. These exceptional grades confirm the presence of world-class antimony mineralisation within the Company's strategically positioned project in Idaho, USA.

Located just 12 kilometres from Perpetua Resources' recently permitted Stibnite Gold Project, Resolution's Antimony Ridge is emerging as a potential cornerstone asset in America's critical minerals landscape. Furthermore, with antimony supply security becoming a national priority for the United States, these results position Resolution at the forefront of domestic antimony development.

Outstanding High-Grade Results Validate Antimony Ridge Potential

According to the announcement, the five massive stibnite samples collected from the historical Antimony Ridge Mine delivered consistently exceptional grades across all sample locations. The results demonstrate the robust nature of the mineralised system, with antimony grades ranging from 31.7% to 48.7%.

Average grades across all five samples: 39.2% Sb and 430 g/t Ag

These results are reported to represent some of the highest antimony grades globally from surface sampling. The substantial silver credits, particularly the 890 g/t silver in sample 732008, significantly enhance the economic potential of the Resolution Minerals Horse Heaven project, according to the Company's assessment.

Craig Lindsay, CEO of U.S. Operations, commented:
"These results represent a significant validation of the Antimony Ridge Target and further demonstrate the exceptional grade potential of the Horse Heaven Project. Antimony grades of this magnitude are rarely reported globally, particularly exposed at surface, and the consistent association with strong silver and gold values materially enhances the projects overall value proposition."

Understanding Antimony: A Critical Strategic Metal

What is Antimony?

Antimony is a metalloid element essential for numerous industrial applications, particularly in flame retardants, batteries, electronics, and military applications. The mineral stibnite (antimony sulphide), which comprises Resolution's samples, serves as the primary source of antimony globally.

Strategic Importance for Investors

The strategic value of antimony extends beyond traditional industrial applications. In addition, antimony is classified as a critical mineral by the U.S. government due to supply chain vulnerabilities, with China controlling approximately 60% of global production. This dominance creates strategic concerns for Western economies, particularly given antimony's importance in defence applications and emerging renewable energy technologies.

The U.S. currently imports virtually all antimony requirements, making domestic projects like the Resolution Minerals Horse Heaven project strategically significant for national security and economic independence. Growing demand from battery storage applications and defence sectors has maintained premium pricing for antimony, particularly from secure domestic sources.

For investors, antimony projects offer exposure to both supply security premiums and increasing industrial demand, whilst benefiting from government support for domestic critical minerals development.

Strategic Location Adjacent to Major Permitted Project

Resolution's timing aligns with significant regional developments in Idaho's antimony sector. The project sits immediately adjacent to Perpetua Resources' Stibnite Gold Project, which recently received critical environmental permits and represents one of the largest antimony resources in the United States.

This proximity provides several strategic advantages according to the Company's assessment:

• Proven geological environment with established antimony-gold systems
• Infrastructure potential through proximity to permitted operations
• Regulatory precedent with successful permitting in the area
• Strategic clustering of critical mineral assets

The regional geological setting has historically produced significant antimony mining. Consequently, Resolution's Antimony Ridge represents a continuation of the same favourable geological trends that support the neighbouring permitted project.

Comprehensive Development Strategy Underway

Resolution is reported to be advancing a methodical development approach designed to unlock value across multiple exploration and development fronts. The Company has outlined several immediate catalysts and planned development activities for the Resolution Minerals Horse Heaven project.

Immediate Catalysts

Metallurgical Testing Program

The Company has submitted 100kg of representative samples to Kingston Process Metallurgy Inc. and Independent Metallurgical Operations Pty Ltd for preliminary characterisation studies. These metallurgical tests are expected to inform processing pathways and recovery potential, representing a critical step toward understanding commercialisation potential.

Permitting Advancement

A Plan of Operation has been submitted for drilling and bulk sampling permits, with progress toward enabling expanded exploration activities. Furthermore, the Company has indicated it will provide regulatory updates as permitting milestones are achieved.

Final 2025 Drill Results

Six holes remain pending assay results from the Golden Gate Target, including three diamond core holes from southern Golden Gate and three RC (Reverse Circulation) holes from northern Golden Gate extension. These results are expected to provide a comprehensive view of broader project potential beyond the Antimony Ridge discovery.

Planned Development Activities

Drilling and Bulk Sampling Campaign

An initial drill program is planned upon permit receipt, with bulk sampling designed to test mineralisation extent and support resource definition activities. The campaign will target both Antimony Ridge and Golden Gate prospects within the project area.

Golden Gate Target Expansion

The next phase drilling program is in planning stages, building on what the Company describes as a successful maiden drill campaign. The program aims to expand potential resource definition across the broader Resolution Minerals Horse Heaven project area.

Investment Thesis: Critical Minerals at Critical Time

Resolution Minerals is positioned at the intersection of several powerful investment trends, according to analysis of the project's strategic positioning and development progress.

Strategic Asset Positioning

The Company's assets demonstrate several compelling characteristics that differentiate it within the critical minerals sector. The world-class grades reported at surface are rarely observed globally, whilst the domestic U.S. location addresses critical supply chain vulnerabilities identified by government agencies.

The proven geological setting, adjacent to a major permitted project, provides validation of the regional mineralisation potential. However, multi-metal potential, with significant antimony, silver, and gold values, enhances project economics and provides diversification across commodity exposure.

Execution Excellence

Management has outlined a systematic development approach with clear milestone tracking. The experienced team demonstrates proven track records in resource development, supported by comprehensive competent person oversight of all technical activities.

For instance, progressive results continue to validate and expand project potential, with each phase of exploration building toward resource definition and potential development scenarios.

Market Opportunity

The critical minerals focus aligns with government priorities for domestic supply chain security. Supply security premiums for domestic antimony sources provide additional value drivers beyond traditional commodity pricing.

Growing strategic demand across defence and renewable sectors supports long-term demand projections, whilst limited competition among advanced U.S. antimony projects creates market positioning advantages.

Why Should Investors Follow Resolution Minerals?

Resolution Minerals has positioned itself as a potential leading player in America's critical minerals development. The exceptional antimony grades at Antimony Ridge, combined with strategic location and systematic development approach, create what appears to be a unique investment proposition in the critical minerals space.

Key Tracking Points for Investors

• Metallurgical test results – Critical pathway indicators for commercialisation potential
• Permitting milestones – Progress enabling expanded exploration activities
• Final 2025 drill results – Comprehensive assessment of broader project potential
• Resource definition progress – Advancement toward formal resource estimation
• Strategic partnerships – Potential catalysts for development acceleration

The convergence of world-class grades, strategic location, and growing antimony demand positions Resolution for potential significant value creation. This occurs as the Resolution Minerals Horse Heaven project advances through its systematic development program.

Technical Excellence in Sample Collection

According to the announcement, all samples were collected from within historical open pits and trenches at the Antimony Ridge Mine. Locations were recorded using UTM coordinates (NAD83, Zone 11T), with samples averaging 3.6 kg each, providing substantial material for reliable assay results.

Assaying was conducted using industry-standard fire assay for gold and multi-element ICP (Inductively Coupled Plasma) analysis for antimony and silver. The work was completed by accredited laboratories following standard analytical procedures.

Key Investment Consideration:
Resolution Minerals has validated one of the highest-grade antimony systems globally at a time when U.S. antimony supply security has become a national priority. With metallurgical testing underway and systematic development progressing, Horse Heaven represents a potentially transformational critical minerals asset positioned for significant value creation through strategic timing and exceptional asset quality.

The Company's methodical approach to development, combined with the strategic importance of domestic antimony supply and exceptional grades achieved to date, positions Resolution Minerals as a compelling opportunity within the critical minerals investment landscape.

Could Resolution Minerals Be Your Next Critical Minerals Investment?

With exceptional antimony grades of up to 48.7% at surface and strategic positioning adjacent to America's largest permitted antimony project, Resolution Minerals presents a compelling opportunity in the rapidly evolving critical minerals sector. As the company advances metallurgical testing, awaits final drill results, and progresses systematic development of the Horse Heaven project, investors have the chance to position themselves ahead of potential major catalysts. To explore Resolution's complete project portfolio, review detailed technical data, and access comprehensive investor resources, visit the company's official website and discover why this critical minerals play could be positioned for significant value creation in America's domestic supply chain revolution.