Diablo Resources (ASX:DBO) strengthens exploration momentum at Star Range following high grade surface results

The latest exploration outcomes from the Star Range Critical Minerals Project in Utah have reinforced the technical foundations of Diablo Resources emerging geological model, with high grade silver, antimony and copper results confirming the presence of a robust polymetallic system across multiple prospect areas.

In response to heightened investor interest, Lyle Thorne, Chief Executive Officer, provides a detailed examination of the data, the geological context and the forward work program.

The following investor Q&A gives a deeper, fact based discussion of the project’s progression, ensuring investors gain a comprehensive understanding of the validated mineralisation trends, the structural controls being mapped and the integrated dataset guiding the company toward its maiden drilling program.

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.

What do the standout silver and antimony grades indicate about the broader mineral potential at Star Range?

The initial sampling campaign has demonstrated that Star Range hosts a number of high grade, prospective prospect areas.

At North Star, peak grades include 3,043 g per tonne silver with 1.37 g per tonne gold, alongside further results of 1,592 g per tonne silver with 0.7 percent antimony, 2,311 g per tonne silver with 0.4 percent antimony and 1,243 g per tonne silver with 0.2 percent antimony.

South Star delivered 1,609 g per tonne silver with 4.82 g per tonne gold, while Silver Gulch returned 2,350 g per tonne silver with 0.3 percent antimony and 1,692 g per tonne silver with 0.1 percent antimony.

These outcomes correlate closely with historical datasets, which include 8,760 g per tonne silver with more than 1 percent antimony at South Star and 3,620 g per tonne silver at North Star, noting that earlier sampling rarely reported antimony.

The alignment between new and historical results strengthens confidence in a structurally controlled system exhibiting significant lateral coherence, thereby providing a strong basis for planned future drilling.

How significant is the identification of two new copper areas within the project?

The discovery of copper mineralisation in two previously untested areas meaningfully broadens the project’s critical minerals profile and demonstrates that the system hosts polymetallic signatures beyond the high grade silver and antimony already identified.

Old workings located approximately 1.4 kilometres south west of North Star returned copper values of 4.0 percent and 1.5 percent, while another area situated 0.8 kilometres north of North Star produced copper to 1.0 percent with 0.15 g per tonne gold.

These results are particularly noteworthy given the presence of nearby operational copper prospects within the same district, reinforcing the regional geological context.

The co-occurrence of copper, silver and antimony further enriches the project’s strategic relevance at a time when copper and silver have been designated priority listed materials in the United States.

As part of our reconnaissance mapping and sampling program, the team have identified a number of highly prospective structural trends which occur both as vein breccia systems and skarn style mineralisation.

What does the geological setting reveal about the likelihood of defining a sizeable mineral system?

Star Range is situated within a well documented mineral belt in south western Utah that historically produced lead, zinc, copper, gold and silver into the mid 1960s.

The geological architecture consists of north striking and east dipping carbonate and clastic sedimentary sequences intruded by multiple granitoid bodies, including outcropping porphyritic quartz monzonite, which have strongly influenced fluid movement and mineral deposition.

Mineralisation is expressed through manto replacement zones and breccia vein systems that are preferentially hosted along sedimentary contacts, many of which coincide with historical workings mapped throughout the project area.

New assay results also reveal clear zonation, with high lead and zinc values to 46.6 percent lead and 23.3 percent zinc concentrated at North Star, transitioning southward into silver, antimony and gold dominant signatures.

Such zonation patterns are characteristic of comparable Basin and Range systems in Nevada and Utah, thereby strengthening the interpretation of Star Range as a potentially laterally extensive and structurally coherent mineralised corridor.

How will the aeromagnetic survey and pending assays guide the maiden drilling program?

The aeromagnetic dataset now undergoing interpretation is a critical input into the evolving geological model, as it assists in mapping intrusive geometries, structural trends and potential controls on mineralisation.

These insights will be integrated with surface mapping and the full geochemical dataset, which includes the 51 completed samples and a further 65 samples currently at the laboratory.

This combined approach will allow the company to refine the understanding of mineralised system, and allow planning of drilling at priority areas. This systematic process ensures that drilling will begin from a technically rigorous foundation supported by multiple lines of evidence.

Further sampling, focused on defining and extending mineralisation along these prospective trends has been completed.

What are the next steps and how soon could investors expect drilling to commence?

Diablo Resources immediate focus is on the completion of the airborne magnetic interpretation, continued regional mapping and analysis of the pending sample results.

Once integrated, these datasets will enable Diablo to refine its geological model and finalise drilling locations at priority target areas.

Concurrently, the company is reviewing further critical mineral opportunities in the United States, supported by existing in country expertise, while ensuring that the advancement of Star Range remains data driven and technically disciplined.

These steps collectively position the project for a well informed transition into drilling.

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.

Advancing a robust, data led exploration pathway

The early work at Star Range has substantiated the project’s geological credentials, with high grade assay results, historical validation and structural zonation all pointing toward a coherent polymetallic system.

The integration of geophysical, geochemical and mapping datasets is enabling Diablo Resources to refine its understanding of the mineralisation controls with increasing precision, ensuring its maiden drilling program is grounded in a well-supported technical rationale.

Lyle Thorne, Chief Executive Officer, affirms that the company remains committed to a measured and evidence based approach, positioning Star Range to progress through its next exploration stage with clarity and confidence.

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