Marquee Resources Ltd Antimony Resource Expansion Reaches 11,000t

Company-Making Milestone Positions Marquee Among Australia's Leading Antimony Players

Marquee Resources Ltd antimony resource expansion represents a transformational milestone with the release of its updated Mineral Resource Estimate (MRE) at the Mt Clement Eastern Hills Project. The company has expanded its Inferred Mineral Resource by an impressive +69% to 1.93Mt at 0.6% SbEq for 11,000t SbEq of contained metal, with antimony contributing 10,000t of contained metal.

This substantial upgrade follows completion of the Phase 2 drilling campaign in late 2025, with final assays significantly expanding the scale and strategic importance of the project. The resource now represents one of Australia's most significant antimony inventories, positioning Marquee as a genuine player in the critical minerals space.

Resource Expansion Breakdown

The updated MRE demonstrates substantial growth across all key metrics. Furthermore, the expansion has been driven by the successful delineation of eight new mineralised structures during Phase 2 drilling, with five of these now incorporated into the updated resource estimate.

Approximately 90% of the antimony metal is contained within the open pit component, providing attractive potential economics for future development. In addition, this distribution significantly enhances the project's commercial viability.

Executive Chairman Charles Thomas commented:

"This is a Company-making milestone for Marquee. Delivering an updated Inferred Mineral Resource Estimate of 1.93Mt at 0.6% SbEq for 11,000t SbEq — including 10,000t of contained antimony metal — is a major step-change in scale for both the Project and the Company as a whole."

Understanding Antimony: A Critical Mineral with Strategic Importance

Antimony is a silvery-white metalloid that has become increasingly critical to modern industrial applications. The metal is essential for flame retardants, battery technologies, semiconductors, and military applications.

China currently dominates global supply, controlling approximately 85% of world production, making secure alternative sources strategically valuable. Consequently, the Marquee Resources Ltd antimony resource expansion carries significant strategic importance in the global supply chain.

The metal is classified as a critical mineral by multiple governments due to supply chain vulnerabilities and growing demand in renewable energy storage and defence applications. Antimony prices have remained elevated, trading around US$48,000 per tonne, reflecting tight supply conditions and strategic importance.

For investors, antimony deposits offer exposure to a niche market with limited global players, strong pricing dynamics, and increasing government focus on supply chain security. Australia currently has limited antimony production, making Mt Clement Eastern Hills particularly valuable from a strategic minerals perspective.

Exploration Target and Future Growth Potential

Beyond the current resource, Marquee has declared an Exploration Target of approximately 2Mt to 4Mt with antimony grades of 0.7% to 1.1%. This target is based on several key geological factors.

Strike extension structures in the Taipan and Dugite zones, each extending approximately 200m, represent significant opportunities. Furthermore, mineralised rock chip samples beyond current open pit outlines indicate substantial potential for resource expansion.

Depth extensions to high-grade underground domains that remain open provide additional growth prospects. The upcoming Phase 3 drilling program commencing in March 2026 will specifically target these expansion opportunities, with planned drill holes designed to test strike extensions, target structures, and depth extensions of the underground resource.

Strategic Partnership Developments with Yantai Jinao

Marquee's strategic positioning has been significantly enhanced through developing relationships with Yantai Jinao, a major Chinese antimony processor. The company has delivered two shipments of high-grade antimony-lead-silver ore for metallurgical test work, with the first sample meeting expectations in terms of grade and quality.

Recent developments include:

• Successful first sample testing prompting submission of higher-grade second sample
• Chairman-level meetings in China between Marquee and Yantai Jinao executives
• Aligned strategic vision for upstream development and downstream partnership opportunities
• Ongoing metallurgical test work to derisk processing pathways

These engagements position Marquee to establish Mt Clement as a credible, strategically important antimony supply source. Additionally, potential for integrated supply chain partnerships could accelerate project development significantly.

Investment Thesis: Strategic Antimony Exposure in Australia

The Mt Clement Eastern Hills project offers investors several compelling investment angles. However, the Marquee Resources Ltd antimony resource expansion represents the most significant development to date.

Scale and Strategic Positioning

10,000t contained antimony metal places the project among Australia's leading antimony resources. Located adjacent to Black Cat Syndicate's antimony deposit (quoted as "Australia's Largest Undeveloped Antimony Deposit"), the combined system represents significant antimony district with potential for integrated development.

Critical Minerals Exposure

Antimony classified as critical mineral by multiple governments reflects increasing supply chain security concerns. Supply chain security increasingly important theme for governments and industry, whilst Australian deposits carry strategic premium given China's supply dominance.

Development Pathway Clarity

90% of metal in open pit component provides attractive development economics. Ongoing metallurgical test work with established processor derisking processing pathways, whilst strong grades and consistent mineralisation support robust project fundamentals.

Near-term Catalysts

Phase 3 drilling program commencing March 2026 targeting resource expansion provides immediate catalyst potential. Continued metallurgical test work results expected, alongside potential strategic partnership announcements with Yantai Jinao.

Project Infrastructure and Location Advantages

The Mt Clement project benefits from its strategic location in Western Australia's Pilbara region, positioned 30km southwest of Black Cat Syndicate's Paulsens gold mine. The project sits within established mining infrastructure corridors with access to proven advantages.

Proven mining jurisdiction with supportive regulatory framework provides regulatory certainty. Existing infrastructure including roads, power, and processing facilities in the region reduces development costs significantly.

Skilled workforce and established mining service providers are readily available. Port access through established Pilbara export channels ensures efficient product delivery to global markets.

This infrastructure positioning reduces development risk and potential capital requirements compared to greenfields locations. Consequently, the project offers enhanced development economics.

Why Investors Should Follow Marquee Resources

Marquee Resources has transformed from an early-stage explorer into a significant antimony player through systematic resource development and strategic partnership building. The Marquee Resources Ltd antimony resource expansion validates the company's aggressive exploration strategy and confirms the Mt Clement system as a cornerstone asset.

What Makes This Resource Expansion Significant?

The +69% resource expansion represents more than incremental growth. For instance, the expansion demonstrates the district-scale potential of the Mt Clement system and validates Marquee's exploration methodology.

Key Tracking Points for Investors:

1. Resource Growth Trajectory: Phase 3 drilling results and potential for further resource expansions
2. Strategic Partnership Development: Progress on Yantai Jinao relationship and potential offtake agreements
3. Metallurgical Results: Test work outcomes supporting processing pathway optimisation
4. District Consolidation: Potential for integrated development with adjacent Black Cat deposit
5. Critical Minerals Policy: Government support and funding opportunities for antimony projects

The company has successfully positioned itself at the intersection of critical minerals policy, strategic supply chain security, and robust project fundamentals. With antimony firmly recognised as a critical mineral and supply security now a central theme for governments and industry, Mt Clement Eastern Hills carries genuine strategic weight.

How Does This Position Marquee in the Market?

Furthermore, the Marquee Resources Ltd antimony resource expansion establishes the company among Australia's premier antimony developers. The combination of resource scale, strategic location, and developing partnerships creates a compelling investment proposition.

Key Takeaway:

Marquee Resources has established Mt Clement Eastern Hills as one of Australia's premier antimony assets, with 10,000t of contained antimony metal and clear development pathways. The combination of strong grades, strategic location, and developing Chinese partnerships positions the company as a leader in Australia's emerging antimony sector. With Phase 3 drilling commencing in March 2026 and ongoing strategic discussions, investors should monitor MQR as a core critical minerals exposure.

The upgraded resource represents more than just geological success—it validates Marquee's strategic vision of building Australia's next significant antimony operation in an increasingly supply-constrained global market.

Want to Position Yourself in Australia's Next Major Antimony Story?

With Marquee Resources establishing itself as a leading player in Australia's critical antimony sector through this transformational +69% resource expansion, savvy investors are taking notice. The combination of 10,000t contained antimony metal, strategic partnerships with Chinese processors, and upcoming Phase 3 drilling presents a compelling opportunity in the supply-constrained critical minerals space. Don't miss your chance to explore how MQR's Mt Clement Eastern Hills project could fit into your portfolio as governments worldwide prioritise antimony supply security. Discover the full investment story and latest developments at www.marqueeresources.com.au.