08:40 AM EDT, 09/03/2025 (MT Newswires) -- GR Silver Mining ( GRSLF ) , which jumped more than 14% yesterday, on Wednesday announced said it intersected an "extensive" high grade epithermal silver system.

In a statement GRSL cited a 75 metre wide (down-hole) silver intercept, including multiple high grade (more than 1,000 g/t Ag) intervals, from the current step-out drilling program.

It said drill hole SMS25-09 returned a 75 m wide intercept at 293 g/t AgEq, including high-grade silver interval up to 6.4 m at 1,915 g/t AgEq. This "excellent" result has expanded the mineralized footprint, extending high-grade mineralization by an additional 100 metres below the previous resource outline at the San Marcial Area of the Plomosas Project in Sinaloa, Mexico, it added.

GRSL's President and CEO, Marcio Fonseca, said, "Step-Out drilling at San Marcial has delivered strong results, confirming wide zones of high-grade, silver-dominant mineralization 450 metres below surface. Guided by advanced geological work and 3D modelling, this first-ever step-out drilling campaign has successfully tested extensions of the San Marcial epithermal silver rich system. The transition of mineralization with depth, highlighted by changes in alteration and lithology, supports our interpretation of a robust epithermal system hosted along the northern edge of a large, regional porphyry intrusive setting. The results demonstrate significant potential for future resource growth, marking a key milestone that opens the door for continued expansion beyond current boundaries. We congratulate our geological team for this achievement, which provides encouragement for substantial exploration success in upcoming San Marcial drilling."