Mr. Eric Zaunscherb reports

GR SILVER MINING ANNOUNCES RESUMPTION OF PLOMOSAS SILVER PROJECT FIELD WORK

GR Silver Mining Ltd. has resumed fieldwork, including drilling on the Plomosas silver project, in Sinaloa, Mexico. Although there had been no incidents of violence on the company's properties, and no threats to the company or its employees or consultants in accessing the project, management had decided to temporarily pause fieldwork (April 29, 2025, news release) to allow time for the considerable efforts of the government of Mexico to increase security and stability in the project region.

President and chief operating officer Marcio Fonseca noted: "The security situation in the project region appears to have stabilized based on our observations on site and in extensive discussions with members of our community and various levels of government. We are grateful to these stakeholders for their efforts to improve conditions. Our highly experienced in-country team has expressed confidence in the current situation and their ability to safely return to active field exploration. We are very excited to resume sampling and drilling the prospective targets we have outlined. The exploration team has returned to activities on site prioritizing surface investigations, prior to conducting stepout drilling of high-grade silver results returned from some previous trench sampling in the NW [northwest] and SE [southeast] extensions of the current NI 43-101 resource."

Previous surface exploratory trench results include:

• NW extension -- 56 metres (m) at 196 grams per tonne (g/t) silver (Ag), including 15 m at 472 g/t Ag (Feb. 21, 2019, news release);
• New hydrothermal breccias (subparallel breccias), 12 m at 323 g/t Ag within a broader zone of 24 m at 219 g/t Ag, including high-grade Ag up to one m at 974 g/t Ag (May 22, 2019, news release).

Management believes that these previous results provide further encouragement for potential expansion of the resource with planned stepout drilling.

On March 3, the company announced the commencement of a stepout drilling program aiming to expand the San Marcial mineralization footprint by as much as 350 m northwest from the current National Instrument 43-101 resource area, as well as test potential new parallel zones located immediately to the southeast of the current NI 43-101 resource area. The company has completed surface evaluation along 500 m of strike length, focused on a prospective geological contact with evidence of silver mineralization and seeking blind targets. Initial field results indicate new prospective drilling targets along this potential mineralization footprint extension.

Noting that the safety of the company's employees, consultants, suppliers and community members remains paramount, management considers it prudent to resume this program while vigilantly monitoring the situation.

Management continues its assessment of and potential implementation of a bulk sampling test mining program at the permitted former Plomosas mine, similar to the previously announced successful program completed at the historical San Juan mine, benefiting from existing permits and infrastructure on site, and explore opportunities to achieve critical mass in the Mexican silver mining industry.

About GR Silver Mining Ltd.

GR Silver Mining is a Canadian-based, Mexico-focused junior mineral exploration company engaged in cost-effective silver-gold resource expansion on its 100-per-cent-owned assets, located on the eastern edge of the Rosario mining district, in the southeast of Sinaloa state, Mexico. GR Silver Mining controls 100 per cent of the Plomosas project, including the former Plomosas underground mine and wide, high-grade silver mineralized zones at the San Marcial area. Recent discoveries in the 78 square kilometres (km) of highly prospective advanced-stage exploration concessions position the company well in the pursuit for resource expansion at the Plomosas project.

We seek Safe Harbor.