• Drilling confirms extension of mineralization to the north of existing Mineral Resource Estimate
• Rock chip sampling returns high-grade silver and gold at surface
• Historic drill core re-assay program demonstrates consistent uplift in silver grades
• Ongoing antimony mineralization identified across the deposit

Sun Silver Ltd is pleased to present its Quarterly Activities Report for the period ending 30 September 2025. The company's cornerstone asset, the Maverick Springs Silver-Gold Project, is located in Nevada, USA and hosts a JORC Inferred Mineral Resource of 296.5Moz of contained silver and 2.2Moz of contained gold. Drilling continued during the quarter as part of the 2025 drill program, with significant results returned from extensional drillholes MR25-211 and MR25-212. These holes encountered extensive mineralized zones to the northwest of the existing Mineral Resource Estimate, highlighting significant potential for further resource growth and expansion. Regulatory approval has been granted for an additional 90 drill pads across the project area to support the expansion of the ongoing drill program. Reconnaissance rock chip sampling has also confirmed significant silver and gold mineralization from surface outcrops at the project. The company is undertaking a large-scale re-assay program targeting historical drill core and pulps, which has demonstrated a consistent uplift in historic silver grades. Additionally, the re-assay program has continued to confirm the presence of antimony mineralization within the existing silver-gold Mineral Resource. Sun Silver has also commenced the process for completing a listing on the U.S. OTC Market, and announced a transformational $30 million placement led by leading domestic and international institutions to underpin ongoing drilling, technical de-risking, further resource upgrades and strategic development at Maverick Springs.

The company plans to continue its aggressive exploration and development program at the Maverick Springs Project, including ongoing in-fill and extensional drilling, metallurgical test work, historic drill core re-assay programs, and the commencement of scoping-level development studies and permitting.