Material uplift in Mineral Resource Estimate for the Abra Operation

Endurance Mining is pleased to report an updated Mineral Resource Estimate for the Abra Silver-Lead Mine in Western Australia, independently verified by Entech Pty Ltd.

The update is based on a 45,500m accelerated grade control and Resource definition drill programme, completed in 2025. It significantly improves the Company’s confidence in the Abra orebody, delivering a 35% uplift in the Measured and Indicated category to 17.6 million tonnes.

The increase in orebody confidence is accompanied by an uplift in grades, including a 14% increase in Ag grade to 18.5g/t resulting in a 33% increase in contained silver metal to 18.5Moz, and a 4% increase in Pb grade to 7.2% resulting in a 21% increase in contained lead metal to 2.2Mt.

The MRE update highlights include:

• 31.1Mt grading 7.2% lead and 18.5g/t silver for 2.2Mt of contained lead and 18.5Moz of contained silver.
• Resource independently reviewed and endorsed by Entech Pty Ltd.
• Compared to the November 2024 MRE completed by Entech, the 2026 MRE delivered:
  • 17% increase in total Resource tonnes to 31.1Mt, including a 35% increase in Measured and Indicated Resources to 17.6Mt.
  • 14% increase in silver grade to 18.5g/t and 33% increase in contained silver metal to 18.5Moz.
  • 4% increase in lead grade to 7.2% and 21% increase in contained lead metal to 2.2Mt.

Said CEO Matthew Hine:

“The 2026 Mineral Resource Estimate, which has been independently reviewed by Entech, continues to bolster our confidence in Abra’s large, high-quality Resource base.

“Our decision to invest heavily in an extensive underground drill programme has delivered excellent results, increasing both tonnage and grade, as well as upgrading Resource classification.

“Importantly, Abra’s mineralisation remains open along strike and at depth. Our attention is turning towards extensional opportunities, with drilling and geophysics programmes underway.

“This complements our recently recommenced regional exploration programme, which has identified high potential satellite targets. Early results from Manganese Range delivered multiple intercepts close to surface and within trucking distance of the Abra Processing Plant.

“Endurance is aggressively pursuing its strategy to emerge as a silver-focused, mid-tier, multi-asset producer.”