Announcement PDF ASX/Media Announcement KINGSTONRESOURCES.COM.AU 202/201 Miller Street, North Sydney, NSW 2060 +61 2 8021 7492 info@kingstonresources.com.au Follow us on X (Twitter) @KSNResources Accelerated Copper Production at Mineral Hill Highlights: • Accelerated path to copper revenue with first copper concentrate production from underground mining achieved a quarter ahead of schedule. • High-quality, saleable concentrate produced (+20% Cu) with strong recoveries (88% Cu, 74% Au), demonstrating robust processing performance. • Underground restart de-risked, with successful underground ore mining and plant optimisation ahead of full-scale production. • Strengthened production profile as Mineral Hill evolves into a multi commodity (gold, silver and now copper) producer, improving revenue diversification. • Positioned to benefit from strong copper fundamentals, with increasing exposure to copper at a time of favourable long-term demand outlook. Managing Director and CEO, Andrew Corbett commented: “This is an outstanding step forward for Mineral Hill and a strong reflection of the team’s execution on site. Successfully advancing underground development while continuing open pit mining - and already delivering underground ore to the plant – positions us ahead of schedule. The early trial has delivered important benefits, including optimisation of the flow sheet and reagent scheme, and the production of a saleable copper concentrate. Importantly, it allows us to identify and resolve any operational challenges ahead of full- scale underground processing, materially reducing execution risk. Following the trial, the plant will revert to processing open pit ore through to August/September. This provides the underground team with the time required to continue development and ramp up toward long hole stoping, which is expected to commence later this quarter.” 28 April 2026 KINGSTONRESOURCES.COM.AU | ASX: KSN 2 Figure 1 (a) and (b): Copper flotation (bubbles) and the resultant copper concentrate. Kingston Resources Limited (ASX: KSN) (‘Kingston’ or ‘The Company’) is pleased to announce successful completion of a processing plant trial on an initial 6,000 tonnes of low-grade copper and gold ore at Mineral Hill. Following the closure of underground operations in 2015, Kingston recommenced underground development at Mineral Hill in the last quarter, achieving two key milestones: the restart of underground mining and the processing of underground copper ore through the Mineral Hill plant. The successful trial has enabled copper sales to commence a quarter earlier than scheduled. The key objectives of the trial included: ✓ Opportunity to familiarise and train plant operators in base metal concentrates ✓ Optimise the plant flow chart before full underground ore processing ✓ Reagent testing and trials ✓ Identification of process improvements and adjustments ✓ Concentrate sample collection for offtake discussions ✓ Produce a saleable copper and gold concentrate KINGSTONRESOURCES.COM.AU | ASX: KSN 3 Figure 2: Clockwise from top left. Copper flotation tank, process plant cyclone, ore crusher loader and filter press operations. KINGSTONRESOURCES.COM.AU | ASX: KSN 4 About Kingston Resources Kingston Resources is currently producing gold and silver from its Mineral Hill gold and copper mine in NSW. The Company’s objective is to establish itself as a mid-tier gold and base metals company with multiple producing assets. Forward-Looking Statements This announcement contains forward-looking statements, including statements regarding plans, strategies, objectives, anticipated production timelines and market outlook. These statements are based on current expectations and assumptions and are subject to risks and uncertainties. Actual results may differ materially from those anticipated. Kingston undertakes no obligation to update forward-looking statements after the date of this announcement. This release has been authorised by the Kingston Resources Limited Board. For all enquiries, please contact Managing Director, Andrew Corbett, on +61 2 8021 7492. Mineral Hill Mine, NSW (100%) • Mine plan out to the end of 2031: Open pit and underground mining. • Significant upside: Measured and Indicated Resources comprise 60% of the 10 Mt resource – substantial opportunity for conversion to Ore Reserves • Excellent Infrastructure: Operating processing plant capable of producing multiple concentrates and precious metal dorѐ. • Exploration potential: Exceptional upside within current Mining Leases (ML) and Exploration Licenses (EL). • Current Focus: Open pit mining at Pearse, production of gold concentrate and precious metal dorѐ on site. Underground level development and diamond drilling at SOZ.