Rokeby Resources Launches Nine-Hole Drilling at Fully Permitted Sunnyside Deposit in Victoria's Omeo Gold Project

Rokeby Begins First Drilling Campaign at Sunnyside Deposit Post-Acquisition

Rokeby Resources has commenced its inaugural drilling program at the Sunnyside deposit within the Omeo Gold Project, marking a key milestone after acquiring the asset. Drilling started on 28 May 2026, with four holes totaling 916.45 metres completed to date. A fifth hole is in progress, and four more holes are planned to complete the nine-hole program. This marks Rokeby's first drilling activity at Omeo, underscoring its commitment to advancing exploration and resource definition rapidly.

The Sunnyside deposit is fully permitted for the current drilling, eliminating regulatory delays common in exploration. Samples from completed holes have been sent to external laboratories for assay analysis, with results to be released as they are received and evaluated. This ensures high data quality and thorough assessment before public reporting.

Targeting High-Grade Mineralisation Shoots in Structured Sunnyside Exploration

The drilling program targets six distinct high-grade mineralisation zones identified from previous drilling and mining at Sunnyside. The nine-hole, 2,180-metre campaign is designed to extend known mineralisation along strike and at depth, leveraging extensive historical workings.

Key historic intersections supporting this strategy include 15.9 metres grading 52.3 g/t Au from hole SSDH017, 0.8 metres at 238.5 g/t Au from SSDH026, 3.55 metres at 26.6 g/t Au from SSDH053, and 2.65 metres at 23.9 g/t Au from SSDH045. The current program includes twinning historical holes to verify mineralisation, testing plunge extensions, and infill drilling around high-grade zones. Early results from the first three holes show good core recovery and minimal deviation from planned drill paths.

Mining One Appointed to Update Historical Resource to JORC (2012) Standards

Rokeby has engaged Mining One as the competent person to update the historical Mt Wills resource estimate to JORC (2012) standards. This critical step converts historical data into a compliant mineral resource estimate meeting current industry and regulatory requirements. Previously, Mt Wills resource estimates, covering Maude and Sunnyside deposits, were compiled under JORC Code (2004) and have not been updated to the 2012 standard.

The company states no new information materially affects historical results. Completion of the current drilling and subsequent JORC (2012) resource update will provide a modern framework for understanding Sunnyside’s mineralisation and guide expanded drilling plans across Mt Wills. Engaging an independent competent person enhances credibility and demonstrates Rokeby’s commitment to transparent resource reporting.

Omeo Gold Project Situated in North-East Victoria with Secure Tenure

The Omeo Gold Project lies about five hours north-east of Melbourne in a historically prolific gold mining region. It includes two main tenement areas: Mt Wills, covering exploration licence EL 6323 and one of Victoria's longest continuously granted mining leases (MIN 4921), and the Cassilis area, comprising exploration licences EL 5504 and EL 5427. Mt Wills hosts a historical mineral resource estimate across Maude and Sunnyside deposits, which remains open along strike and at depth.

Proximity to Melbourne offers logistical advantages, while the long-standing mining lease at Mt Wills provides tenure security. This allows Rokeby to focus immediate drilling on the fully permitted Sunnyside deposit while retaining flexibility across broader exploration areas. The combination of historical productivity, secure tenure, and permitting supports the asset’s development-ready status.

Historical Gold Production Exceeds 235,000 Ounces at High Grades in Mt Wills

Mt Wills has a rich history of gold mining, producing over 235,000 ounces at grades above 18 g/t Au. This production record validates the presence of economic gold mineralisation and confirms the district’s prospectivity. The high grades indicate Mt Wills deposits are characterised by ultra-high-grade shoots rather than bulk-tonnage mineralisation, aligning with Rokeby’s current drilling targets.

Consistent high grades from historical mining support Rokeby’s exploration strategy. The current Sunnyside drilling targets shoots with grades up to 238.5 g/t Au in historical samples, aiming to define discrete, high-grade zones for efficient extraction and processing, consistent with the company’s exploration model.

Structured Nine-Hole Drilling Program Focuses on Six High-Grade Zones at Sunnyside

The nine-hole, 2,180-metre drilling program systematically tests six high-grade zones via twinning, extension, and infill drilling. Completed holes include one twinning historical hole SSDH017 to confirm 15.9 metres grading 52.3 g/t Au, and two testing up and down plunge extensions of that mineralisation. Another hole tests down plunge extension of mineralisation in SSDH001.

Ongoing and planned holes will continue this approach, including one targeting down plunge mineralisation in SSDH040, two testing around the 2.65-metre intersection grading 24.9 g/t Au from SSDH045, and another around the 3.5-metre intersection grading 26.6 g/t Au from SSDH053. This targeted drilling maximises meterage efficiency by focusing on the most prospective zones and extending mineralisation vertically, laterally, and along plunge directions.

External Laboratory Assay Analysis Ensures Rigorous Sample Processing

Rokeby has contracted an external laboratory for assaying samples from the drilling program. Samples from completed holes have been dispatched for analysis, with results to be reported as received and interpreted. Using external labs ensures analytical independence and quality control.

Assay timing depends on laboratory schedules and Rokeby’s internal reviews. The company commits to timely reporting of results. Early data from the first three holes indicate positive drilling performance, including good core recovery and minimal deviation, supporting confidence in sample quality and drilling methods.

Ambitious 12-Month Work Program to Expand Resource Base at Mt Wills

Rokeby has launched an aggressive 12-month program to build on the historical resource at Mt Wills. Managing Director Richard Beazley highlighted that the structured approach leverages extensive historical workings and high-grade shoots across Sunnyside and Maude. The current nine-hole Sunnyside program lays the foundation for a broader initiative, with results guiding expanded drilling across the Mt Wills mining lease.

This systematic program reflects management’s strategic resource definition approach and confidence in the asset’s prospectivity. By upgrading and expanding the historical resource estimate, Rokeby employs an efficient exploration model based on decades of data rather than starting from scratch. Planned drilling expansion aims to define multiple discrete high-grade zones supporting integrated mining and processing operations.

Fully Permitted, Development-Ready Sunnyside Deposit Provides Competitive Edge

The fully permitted Sunnyside deposit is development-ready, offering Rokeby a significant advantage in exploration and development. Necessary regulatory approvals and environmental assessments are complete, enabling immediate drilling without further permitting delays. This status distinguishes Omeo Gold Project from earlier-stage assets and reflects project maturity.

Located within the Mt Wills mining lease (MIN 4921), one of Victoria’s longest continually granted leases, the deposit benefits from tenure security and a robust regulatory framework. This low-friction environment supports Rokeby’s planned exploration and resource definition without major regulatory obstacles.

Drilling Results to Inform Expanded Exploration Across Maude and Sunnyside

The Sunnyside drilling program forms the basis for a wider exploration campaign across Mt Wills. Results from the nine-hole program will guide subsequent drilling phases integrating Maude and Sunnyside deposits. The company expects these results to underpin a JORC (2012) resource estimate and support expanded drilling to better define mineral resources across the property.

This phased approach allows Rokeby to refine geological understanding and prioritize targets iteratively. Mining One’s resource update provides a compliant platform to assess drilling success. By aligning exploration with resource estimation and results reporting, Rokeby has established a clear roadmap for systematic asset advancement over the next 12 months.