GR Silver drills 21.9 m at 168 g/t Ag including 6.15 m at 447 g/t Ag at San Marcial SE

Canada NewsWire VANCOUVER, BC , July 10, 2026 /CNW/ -  GR Silver Mining Ltd. ( " GR Silver Mining" or the "Company" ) (TSXV: GRSL) (OTCQX: GRSLF) (FRANKFURT: GPE) is pleased to announce positive drill results from the resource expansion drilling program at the San Marcial Area in the Plomosas Project, Mexico. Diamond drilling on the SE Extension target confirms the extension of high-grade silver mineralization for least an additional 150 metres to the southeast of the 2023 NI 43-101 Mineral Resource Estimate ("MRE") boundary. The drill hole results reported in this release represent two separate target areas: 1) the SE Extension target, looking to expand the existing MRE to the southeast along the main, breccia-hosted structures; and 2) the Parallel Breccia target, which aims to understand the nature of prospective newly identified mineralized structures in the vicinity of the MRE (Figure 1).

Highlights of Latest Step-Out Dri l l i ng at San Marcial SMS26-07 intersected two distinct mineralized zones in the SE Extension target . The upper zone is hosted within chlorite–hematite-rich breccias at the contact between the upper Oligocene volcanic sequence and the lower Jurassic volcano-sedimentary sequence, while the lower zone occurs within hydrothermal breccias and stockwork systems developed in the lower Jurassic volcano-sedimentary sequence. The presence of mineralization in both horizons further supports the interpretation of a laterally extensive hydrothermal system and reinforces the exploration potential of the SE Area of San Marcial. 21.9 m true width ("TW") at 168 g/t Ag and 1.41% Zn, from 191.5 m down hole including 6.15 m TW at 447 g/t Ag and 0.85% Zn SMS26-08  intersected a near-surface mineralized zone composed of quartz–calcite–tourmaline stockwork veinlets developed at the intersection with a N