GR Silver Confirms Extension of Mineralization at San Marcial, Including 16.1 m at 162 g/t Ag and 11.7 m at 147 g/t Ag in the SE Area

Canada NewsWire

VANCOUVER, BC , Sept. 8, 2026 /CNW/ -- GR Silver Mining Ltd. ("GR Silver Mining" or the "Company") (TSXV: GRSL) (OTCQX: GRSLF) (FRANKFURT: GPE) is pleased to announce that its ongoing 20,000-metre ("m") drill program at San Marcial, Mexico, continues to deliver significant drill intercepts confirming extension of mineralization beyond the 2023 NI 43-101 Mineral Resource Estimate ("MRE") resource area.

Highlights

Hole SMS26-12 returned 16.1 m true width ("TW") at 162 g/t Ag, including 0.7 m TW at 1,344 g/t Ag.

Hole SMS26-14 returned 11.7 m TW at 147 g/t Ag, including 2.85 m TW at 429 g/t Ag.

Results from holes SMS26-12 and SMS26-14 confirm the extension of mineralized breccias for at least 300 m to the southeast (Figure 1) and 75 m at depth from the 2023 MRE resource boundary.

The mineralized system of breccias is now known to extend over a total strike length of approximately 1 kilometre and the observed mineralogical assemblage provides clear indications that mineralization may extend beyond the currently defined limits.

As our drill program progresses, future holes will test around hole SMS26-04, which returned 45.1 m TW at 1,623 g/t Ag, including 8.25 m at 8,579 g/t Ag (see News Release dated May 19, 2026), as well as other nearby targets.

Results from drill holes in the SE Area Extension (Tables 1 and 2), particularly SMS26-12 and SMS26-14, confirm the extension of high-grade silver mineralization within chlorite–hematite hydrothermal breccias hosted at the contact between the upper Oligocene volcanic sequence and the lower Jurassic volcano-sedimentary unit. Additional drill holes, including SMS26-09, SMS26-10, SMS26-13, and SMS26-15, confirm that the high-grade zones are strongly structurally controlled, occurring at the intersection of NE-SW structural trends with NW-SE and E-W hydrothermal