ELDORADO GOLD CORP /FI

Underground Development

Underground access development rates continued to accelerate. A total of 1,155 metres of underground development was completed in Q4 2025. During 2025, underground development totalled 3,092 metres, which was approximately 900 metres more development than budgeted during the year.

The test stope program delivered high quality results during the quarter. The first of two test stopes were completely mined out and the second test stope mining will be completed in February 2026. Each test stope mined to date is expected to provide approximately 72kt of ore, with dimensions of 60 metres in height and an area of 30 by 15 metres. Ore fragmentation has exceeded expectations, and stope cavity monitoring and extraction has met our expectations. This success has increased our confidence in the planned trial of four larger test stopes in 2026, each designed at approximately 97kt per stope with dimensions of 60 metres in height and an area of 30 by 20 metres per stope.

Semi-autonomous ore loading and open stope drilling, with operators on surface (no operator on the equipment), was successfully used during the mining of these two test stopes. This technology enables a single operator to control several pieces of equipment simultaneously, increasing safety, drill accuracy and productivity, reducing idle time between shifts and during blast clearance, and decreasing associated costs.