08:20 AM EDT, 08/21/2025 (MT Newswires) -- GR Silver Mining ( GRSLF ) on Thursday provided drilling results from the ongoing Step-Out Drilling Program adjacent to the 2023 NI 43-101 mineral resource at the San Marcial Area, Plomosas project, in Sinaloa, Mexico.

The company said drilling at hole SMS25-08 successfully discovered a new high-grade gold-silver epithermal vein and intersected a wide, predominantly silver-mineralized intercept hosted in hydrothermal breccia. Hole SMS25-07A intersected multiple zones of wide silver mineralization at shallow depth.

It said hole SMS25-08 was drilled to test the down-dip continuity of silver mineralization 45 metres below historical trench results, targeting a perpendicular orientation to the northeast structures and their intersections with northwest-oriented regional structures. The presence of mineralization at these intersections oriented towards the northeast represents a "potential opportunity for resource expansion at this target."

"Each batch of drill results received from the step-out drilling program increases the prospective scale of the San Marcial Area, potentially unlocking a much larger resource," said GR Silver Mining ( GRSLF ) Chief Executive Marcio Fonseca. "The continuity of high silver grades and broad widths of predominant silver mineralization encountered at shallow depths, as revealed by the step-out drilling, supports the opportunity to continue drilling and expanding resources in the vicinity of the San Marcial Resource Area."

"We await additional assay results now from the SE Deep Extension target, which we believe will potentially lead to an extension of mineralization below existing resource boundaries," said Fonseca.

Shares of the company closed up 6.7% to $0.16 on Wednesday on the TSX Venture Exchange.