Diablo Resources Expands 3,000-Metre Silver-Antimony Trend and Unveils New Copper Anomaly at Star Range Project, Utah

South Star Silver-Antimony Anomaly Now Exceeds 3,000 Metres in Length

Diablo Resources’ latest geochemical sampling has significantly expanded the South Star silver-antimony anomaly by approximately 1,400 metres northeastward. Combined with previous southern results, this extends the prospective trend to over 3,000 metres, offering a substantial area for further exploration and drill target definition.

Historical mapping in South Star has identified multiple old workings featuring silica-carbonate veins and breccia zones. Prior rock chip assays from these areas returned silver grades up to 534 grams per tonne and antimony concentrations of 0.19%. The expanded anomaly presents a promising opportunity for Diablo to conduct infill sampling, geological mapping, and structural analysis to refine upcoming drill targets. The company’s regional strategy emphasizes extending mineralized trends and developing a strong pipeline of exploration targets throughout the Star Range Project.

East Star Uncovers New Copper-in-Soil Anomaly Linked to Historical Workings

Initial soil sampling at East Star has delineated a coherent copper-in-soil anomaly approximately 400 metres by 200 metres in size, significantly enlarging the known mineralization footprint at this prospect. This copper anomaly correlates with historical workings and a northwest-trending structural corridor extending about 400 metres and remains open to the south. Anomalous silver is also associated with this area, indicating a polymetallic mineral system.

These results complement reconnaissance rock chip sampling from late 2025, which yielded several samples exceeding 3% copper, including peak grades of 7.39%. These high-grade rock chip results validate the soil geochemical anomalies and support Diablo’s interpretation of a significant copper mineralization system at East Star. The company plans further infill and extension soil sampling, geological mapping, and rock chip sampling to better define the copper mineralization’s geometry and structural controls prior to detailed drill planning.

Maiden Diamond Drilling at North Star to Begin Soon

Site preparations at North Star are underway ahead of Diablo’s maiden diamond drilling program, scheduled to start in the coming weeks. This campaign marks a key milestone, transitioning from reconnaissance and soil sampling to direct subsurface mineral testing. The drilling will provide the first direct evidence of mineralization at depth across the Star Range Project.

The drilling follows successful geological mapping, geophysical surveys, and soil sampling that have refined the understanding of the polymetallic mineral system. CEO Lyle Thorne stated that Diablo is entering a major phase of drilling and exploration across its Utah portfolio, with soil sampling results expanding the exploration pipeline beyond North Star. The maiden drilling will test the mineral system model and inform future exploration and drilling strategies across the broader project area.

$3.5 Million Placement Secured to Accelerate Drilling-Focused Exploration

Diablo Resources has completed a $3.5 million placement to fund a drilling-led exploration phase across its Utah assets. This capital raise supports advancing priority targets, including North Star’s maiden diamond drilling and ongoing surface exploration at South Star and East Star. The funding underscores investor confidence in Diablo’s exploration approach and the quality of results at Star Range.

The proceeds will enable additional extensional and infill soil sampling to refine silver-antimony and copper anomalies, follow-up mapping and rock sampling to enhance structural interpretations, and detailed drill target planning. The placement also supports the company’s regional strategy to build a pipeline of high-priority critical mineral targets across Utah.

Horn Silver Acquisition Advancing as Strategic Adjacent Opportunity

Diablo is progressing toward completing the acquisition of an 80% interest in the Horn Silver Project, adjacent to Star Range, in line with binding agreement terms. Following shareholder approval, the transaction is on track to close, granting access to a significant pipeline of near-mine and regional silver, antimony, and copper exploration targets. The Horn Silver mine lies about 6 kilometres east of Star Range near Milford in Beaver County, southwestern Utah.

The historic Horn Silver mine was among the largest US silver producers until 1930, yielding 17 million ounces of silver, 25,000 ounces of gold, and 9 million pounds of copper from a 20-acre claim. Total production from 1875 to 1952 was 835,000 tonnes. This extensive production history highlights the region’s mineral potential and supports Diablo’s interpretation of a major polymetallic system. The acquisition will enable target ranking, geological interpretation, and drill planning across priority near-mine and regional targets at Horn Silver.

Geochemical Sampling Confirms Zoned Polymetallic Mineral System Model

The geochemical sampling program at Star Range validates Diablo’s model of a zoned polymetallic mineral system spanning multiple prospects. A total of 73 soil samples were collected on an approximate 200 by 100 metre grid, targeting extensions of known mineralized trends and first-pass coverage over outcropping skarn mineralization. Results show consistent silver-antimony association at South Star and copper with anomalous silver at East Star, supporting a larger mineral system with distinct geochemical signatures by location.

This validation has important implications for exploration strategy and drilling program design. Understanding zoning patterns and structural controls allows more precise drill targeting to test the mineral system’s full extent. South Star and East Star results, combined with geological mapping and geophysical data, are being integrated to rank additional targets. This systematic approach supports advancing the exploration pipeline toward resource definition.

Star Range Project Benefits from Strategic Location and Infrastructure in Southwestern Utah

Located about 6 kilometres west of Milford in Beaver County, the Star Range Project benefits from a region with a rich mining history and solid infrastructure. The project is near the historic Horn Silver and Milford Copper mines. Access is via maintained gravel roads and tracks, with power lines and gas pipelines near the southeast corner. The Union Pacific Railway runs through Milford, offering potential logistics advantages for mineral transport and processing.

Proximity to Milford and existing infrastructure provides operational efficiencies for Diablo’s exploration and drilling. Available road access, power, and rail connectivity reduce costs and facilitate efficient exploration. The region’s mining legacy, including Horn Silver and Milford Copper mines, reinforces its suitability for mineral exploration and development, aligning with Diablo’s strategy to advance exploration and potential mining at Star Range.

Regional Strategy Focuses on Building Critical Minerals Pipeline Across Utah Portfolio

Diablo’s exploration at Star Range is part of a broader regional plan to develop a robust pipeline of high-priority critical mineral targets across its Utah holdings. The company employs a systematic approach involving extending known mineralized trends, identifying new prospects, and integrating geochemical, geological, and geophysical data to define drill targets. This strategy aims to generate multiple drilling opportunities and maximize exploration productivity.

Upcoming activities include additional extensional and infill soil sampling to refine silver-antimony and copper anomalies at South Star and East Star, follow-up mapping and rock sampling to enhance structural interpretations and drill planning, and integration of new geochemical results with existing data to rank further targets. The Horn Silver acquisition expands the portfolio with near-mine and regional targets. CEO Lyle Thorne highlights that Diablo is poised for a significant drilling and exploration phase, continuing to build critical mineral opportunities across Utah.

Next Steps Include North Star Drilling and Target Refinement Across Project

Diablo has outlined next steps to advance priority targets toward maiden drilling at North Star while refining exploration at South Star and East Star. The company will complete additional extensional and infill soil sampling to refine anomalies, conduct follow-up mapping and rock sampling to improve structural understanding, and finalize site preparation and mobilization for North Star’s maiden diamond drilling. Drilling is scheduled to commence in the coming weeks, marking a shift from surface exploration to subsurface testing.

Following North Star drilling, Diablo will integrate South Star and East Star geochemical data with geological and geophysical datasets to rank additional targets. The company will also advance target ranking, geological interpretation, and drill planning at Horn Silver after acquisition completion. These structured exploration activities extend beyond the immediate drilling campaign, demonstrating Diablo’s commitment to systematically developing its Utah portfolio. The timeline is designed to maintain exploration momentum while maximizing geological insights to support future drilling programs.