Endeavour Silver Intersects High-Grade Silver-Lead-Zinc Mineralization at its Kolpa Operation

Executive Summary

• Endeavour Silver reports a series of high‑grade silver‑lead‑zinc‑copper intercepts from recent drilling at the Kolpa Mine (Corridor 3, Poderosa West and Caudalosa Chica veins).
• Notable assays include 247 g/t Ag with 0.77 % Pb, 10.70 % Zn and 0.55 % Cu over 8.20 m (hole DDH‑H1‑25‑88) and 266 g/t Ag with 1.34 % Pb, 4.73 % Zn and 0.23 % Cu over 5.15 m (hole DDH‑H1‑25‑92).
• Management plans to resume drilling in late Q4 2025, expand surface drilling along the 2.5‑km Poderosa West vein, and continue underground development to support step‑out programs.

Key Details

• Project Scope: Ongoing exploration at Kolpa Mine, Huancavelica Province, Peru – focusing on structural “pairing” corridors that enhance mineralization potential.
• Drilling Summary (Corridor 3): 14 holes, 2,343 m total near existing underground workings; additional six holes assayed internally (not QP‑supervised).
• Significant Intercepts:
• Hole DDH‑H1‑25‑88 – 247 g/t Ag, 0.77 % Pb, 10.70 % Zn, 0.55 % Cu over 8.20 m (true width).
• Hole DDH‑H1‑25‑92 – 266 g/t Ag, 1.34 % Pb, 4.73 % Zn, 0.23 % Cu over 5.15 m (true width).
• Additional Notable Results (Table 1):
• DDH‑H1‑25‑106 – 107 g/t Ag, 1.10 % Pb, 1.43 % Zn, 0.19 % Cu over 2.2 m.
• DDH‑H1‑25‑109 – 313 g/t Ag, 8.16 % Pb, 30.00 % Zn, 0.18 % Cu over 0.3 m (Ramal).
• Multiple intercepts in Poderosa West vein ranging from 35–95 g/t Ag with accompanying base‑metal grades.
• Vein Mapping:
• Poderosa West vein now mapped ~2.5 km at surface; Caudalosa Chica vein mapped >1.5 km.
• Future Plans:
• Surface drilling applications submitted for the full 2.5‑km vein.
• Underground development to enable new drill stations and step‑out drilling.
• Drilling program slated to resume in late Q4 2025.
• Qualified Person: Dale Mah, P.Geo., Vice President Corporate Development (NI 43‑101).
• Laboratory Work: Core sent to Certimin Laboratory (ISO‑certified) and Bureau Veritas Laboratory for assay verification; QA/QC protocols employed.

Notable Quotes

“Kolpa’s geology continues to demonstrate outstanding potential, with multiple underexplored targets that point to a long runway of discovery,” said Dan Dickson, CEO.
“We are only scratching the surface and the opportunity to unlock further value through exploration is both exciting and significant.”

Materiality Assessment: Material – Positive (the high‑grade intercepts materially enhance the valuation outlook for Kolpa Mine and indicate substantial upside potential.)