Diablo Resources Delivers Exceptional Silver-Antimony Results at Star Range

Diablo Resources Confirms Exceptional Silver-Antimony Grades at Star Range – Maiden Drilling Program on Track

Diablo Resources (ASX:DBO) has delivered impressive initial results from its Star Range Critical Minerals Project in Utah, with reconnaissance rock sampling confirming exceptional high-grade silver and antimony mineralisation across multiple prospect areas. The company's systematic approach to validating historical bonanza-grade results has positioned Star Range as a compelling critical minerals opportunity in one of the most mining-friendly jurisdictions in the United States.

Outstanding Silver and Antimony Results Validate Historical Performance

The Diablo Resources silver-antimony results from initial surface sampling have returned remarkable grades that confirm and enhance the project's exceptional potential. Furthermore, the first phase of exploration has successfully validated extensive historical work that recorded bonanza-grade silver mineralisation across the project area.

North Star Prospect Highlights:

• 3,043 g/t Ag (97.8 oz) and 1.37 g/t Au – demonstrating bonanza-grade silver potential
• 2,311 g/t Ag (74.3 oz) and 0.4% Sb – showing strong antimony correlation
• 1,592 g/t Ag (51.2 oz) and 0.7% Sb – peak antimony grades confirmed
• 1,243 g/t Ag (40 oz) and 0.2% Sb
• 998 g/t Ag (32.1 oz), 0.2% Sb and 0.78 g/t Au

Additional Prospect Areas:

• South Star Prospect: 1,609 g/t Ag (51.7 oz) and 4.82 g/t Au
• Silver Gulch Prospect: 2,350 g/t Ag (75.6 oz) and 0.3% Sb

According to the company's announcement, these results validate extensive historical work that recorded even higher bonanza silver grades up to 8,760 g/t Ag (309 oz/t) with antimony exceeding 1% at surface. Significantly, the majority of historical sampling did not report antimony, leaving substantial upside potential for the current exploration programme.

"These initial rock sample results collected from Star Range confirm and enhance the historical high-grade silver results whilst providing greater insight into the antimony, copper and gold endowment of the area… With indications of high grade silver, copper and antimony, three, in demand, critical minerals in the USA, we aim to position the Company to take advantage of the USA's push to shore up domestic critical mineral supply in 2026." – CEO Lyle Thorne

Strategic Location in Premium Mining Jurisdiction

Star Range's 186 unpatented lode claims covering 3,582 acres (14.5km²) are strategically positioned in Beaver County, Utah, near world-class mining infrastructure and historical production. In addition, this location provides significant operational advantages for future development activities.

Proximity to Major Operations:

• Horn Silver Mine: Produced 17 Moz silver, 25 Koz gold and 9Mlb copper from just a 20-acre footprint
• Active copper prospects currently being mined nearby
• Established infrastructure including rail, sealed roads, and power

The project sits within a historically productive mineral belt in southwestern Utah, where mining extended into the mid-1960s producing lead, zinc, copper, gold, and silver across structurally controlled Basin & Range geology. This geological setting comprises north-striking, east dipping carbonate and sedimentary rock sequences ranging from ancient to more recent formations, intruded by granite-type rocks that have influenced mineralising fluid pathways.

Understanding Critical Mineral Zonation: A Key Investment Concept

What is Mineral Zonation?

Mineral zonation refers to the systematic distribution of different metals and minerals around a central mineralising source, typically a granite intrusion. As hot, mineral-rich fluids move outward from this source and cool, they deposit different metals at varying distances from the origin.

Why This Matters for Star Range

Early analysis of the Diablo Resources silver-antimony results suggests the project displays classic mineral zonation from north to south. However, this pattern indicates significant exploration potential across multiple commodity types.

• Northern zones (North Star): Exceptionally high lead and zinc values to 46.6% Pb and 23.3% Zn
• Southern zones (South Star/Silver Gulch): Strong silver, antimony and gold with moderate base metals

This zonation pattern indicates a large-scale mineralising system with potential for significant resource development across multiple commodity types. The presence of multiple granite intrusions, including an outcropping granite-type rock identified in the project area, supports this interpretation.

Expanding Copper Discovery Adds Multi-Metal Dimension

The reconnaissance programme has identified two new copper-prospective areas with encouraging initial results. For instance, these discoveries demonstrate the project's multi-commodity potential beyond silver and antimony.

• 4.0% and 1.5% copper from old workings approximately 1.4km southwest of North Star
• 1.0% copper and 0.15 g/t gold from workings approximately 0.8km north of North Star

These copper discoveries, combined with elevated barium (greater than 1%) and manganese (up to 0.8%), support the interpretation of upper-level, low-temperature hot spring-style mineral systems similar to productive Nevada deposits. This geological setting has proven successful at comparable operations, including systems similar to Ruby Hill, where historic mining yielded 1.65 Moz of gold and 39.0 Moz of silver from 2.0 Mt mined.

Clear Pathway to Maiden Drilling Programme

With 65 additional rock samples currently at the laboratory and results pending, Diablo is building a comprehensive database to support systematic drilling. The company's immediate priorities include several key exploration milestones that will advance the Diablo Resources silver-antimony results towards resource definition.

Near-Term Catalysts:

• Complete interpretation of airborne magnetic survey data
• Continue regional mapping and sampling programmes
• Integration of surface geochemical results with magnetic data and satellite imagery
• Update geological models for priority target identification
• Launch maiden drilling programme targeting high-grade vein and rock fragment systems

The systematic approach positions Star Range for rapid advancement through the exploration pipeline. Furthermore, management has indicated that drilling is expected to test multiple high-grade targets across the project area, with the programme designed to test structurally controlled mineral zones and rock fragment systems developed along chemically reactive sedimentary contacts.

Investment Thesis: Critical Minerals in a Premier Jurisdiction

The Diablo Resources silver-antimony results represent a compelling investment opportunity underpinned by several key factors that position the project for potential resource development. Moreover, the project benefits from exceptional geological characteristics and strategic positioning.

Proven High-Grade Mineralisation

• Bonanza-grade silver results up to 8,760 g/t Ag historically recorded
• Current programme confirming exceptional grades to 3,043 g/t Ag
• Strong antimony correlation with growing strategic importance

Strategic Critical Minerals Exposure

• Silver and copper recently priority-listed in the US
• Antimony remains supply-constrained globally
• Positioned to benefit from US domestic critical mineral supply initiatives

Premium Mining Jurisdiction

• Utah's mining-supportive regulatory environment
• Established infrastructure and services
• Proven mineral endowment in the district

Systematic Exploration Approach

• Methodical validation of historical results
• Modern geophysical and geochemical techniques
• Clear pathway to resource development

Why Investors Should Follow Diablo Resources

Diablo Resources has positioned itself as a significant player in the critical minerals sector, with Star Range offering exceptional upside potential through several key differentiators. In addition, the company's 100% ownership of a proven high-grade system provides direct exposure to critical mineral development in a premier jurisdiction.

Near-Term Catalysts

• Pending assay results from 65 additional samples
• Geophysical data interpretation for target refinement
• Maiden drilling programme targeting bonanza-grade zones
• Additional critical mineral opportunities under review in the US

Strategic Positioning

• 100% ownership of a proven high-grade system
• In-country expertise for US critical minerals development
• Strong market timing with growing critical mineral demand
• Established infrastructure reducing development risks

The region has been recognised for its expanding role in US domestic critical minerals supply, with copper and silver recently becoming priority-listed materials and antimony remaining supply-constrained globally. This positioning aligns with the US government's push to shore up domestic critical mineral supply chains.

However, the combination of proven high-grade mineralisation, strategic commodity exposure, and systematic exploration approach positions Star Range as a project to watch closely as the company advances toward resource development. The Diablo Resources silver-antimony results demonstrate exceptional potential in a jurisdiction that supports mining development and critical mineral independence.

Technical Terms Glossary

• Antimony (Sb): Critical mineral used in flame retardants, batteries, and defence applications
• Basin & Range: Geological setting characterised by alternating mountain ranges and valleys
• Hot spring-style deposits: Low-temperature mineral deposits typically rich in precious metals
• Replacement deposits: Flat-lying ore bodies formed by replacement of reactive host rocks
• Reconnaissance sampling: Initial exploration sampling to identify and prioritise targets

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