Endeavour Silver Corp. (NYSE: EXK) (TSX: EDR) is pleased to announce it has achieved commercial production at the Terronera mine located in Jalisco state, Mexico, effective October 1, 2025.

The declaration of commercial production at Terronera comes after a successful commissioning phase during which both mining and processing operations were ramped up to consistently exceed an average of 90% of the designed nameplate capacity of 2,000 tonnes per day, while also achieving at least 90% of the projected metal recoveries.

Terronera has demonstrated remarkable progress, operating for 100 days since July 1, 2025, with eight days of downtime, and has sustained strong metal recoveries since mid-August. This achievement marks an important milestone that positions Endeavour for continued growth and long-term success.

“Bringing Terronera into commercial production marks a huge milestone for Endeavour Silver and represents a truly transformational moment in our Company’s history,” said Dan Dickson, Chief Executive Officer. “This achievement not only reinforces our commitment to sustainable growth but also positions Endeavour as a leading mid-tier silver producer with a solid foundation for future expansion.”

The Company forecasts throughput of approximately 360,000 tonnes over the next six months, with average grades estimated at 122 g/t silver and 2.52 g/t gold. Higher grade zones are scheduled to be accessed by mid-2026, which is expected to further enhance production. Management plans to issue annualized 2026 production and cost guidance for the Terronera mine in January 2026.

Stakeholders are invited to take a closer look at Terronera and the work the team has accomplished. To gain further insight, please watch this short video of the mine here.¹

About Endeavour Silver: Endeavour is a mid-tier silver producer with four operating mines in Mexico and Peru and a robust pipeline of exploration projects across Mexico, Chile, and the United States. With a proven track record of discovery, development, and responsible mining, Endeavour is driving organic growth and creating lasting value on its path to becoming a leading senior silver producer.

Qualified Person

The scientific and technical information contained in this news release has been reviewed and approved by Don Gray, SME-RM, Chief Operating Officer, a Qualified Person as defined under NI 43-101.