Endeavour Silver intersects silver and gold mineralization at Terronera

VANCOUVER, British Columbia, June 18, 2026 (GLOBE NEWSWIRE) -- Endeavour Silver Corp. (“Endeavour” or the “Company”) (TSX: EDR, NYSE: EXK) is pleased to announce positive drill results from its exploration program at its newest mine, Terronera, located in Jalisco, Mexico. Since 2025, the Company has completed 43 drill holes totaling 7,015 metres on the La Luz system and 10 drill holes totaling 1,904 metres targeting the Terronera vein. This marks the first exploration drilling campaign at the Terronera mine since 2020.

The program is designed to expand and better define mineralization along strike and at depth within the Terronera vein system. At La Luz, drilling has focused on defining the limits of mineralization adjacent to historical workings and testing the down-dip extension of the system to support mine design and long-term planning. Key highlights from this program include: LL-43: 574 g/t Ag, 23.92 g/t Au for 2,607 g/t AgEq over 1.06 metres true width LL-77: 1,271 g/t Ag, 0.81 g/t Au for 1,340 g/t AgEq over 0.94 metres true width TRU-001: 282 g/t Ag, 1.80 g/t Au for 435 g//t AgEq over 8.11 metres true width TRU-003: 150 g/t Ag, 6.30 g/t Au for 686 g/t AgEq over 5.32 metres true width “These results demonstrate the exploration potential that exists beyond the current Terronera mine plan," said Luis Castro, Chief Operating Officer. “At both Terronera and La Luz, drilling has successfully extended mineralization along strike and at depth while supporting the continuity of high-grade silver and gold zones.

By advancing mine development, we are better positioned to establish underground drill platforms that allow us to efficiently test priority targets and quickly improve our understanding of the district vein systems. We believe these results highlight the opportunity to grow resources, extend mine life and unlock additional