GR Silver Provides a Corporate Update

About this update from Gr Silver Mining Ltd.

VANCOUVER, BC, May 21, 2026 /CNW/ - GR Silver Mining Ltd. ("GR Silver Mining" or the "Company") (TSXV: GRSL) (OTCQX: GRSLF) (FRANKFURT: GPE) is pleased to provide a corporate update to the market following the release of exceptional drill results on the wholly owned Plomosas Silver Project (the "Project") in Sinaloa, Mexico (see News Release dated May 19, 2026). In a separate, very positive milestone, the Company has received official notification from Mexico's Secretaría de Medio Ambiente y Recursos Naturales ("SEMARNAT") that production of a new Manifestación de Impacto Ambiental ("MIA"), an Environmental Impact Authorization, for the former Plomosas Mine will not be required. This decision is based on the existence of existing infrastructure, the Company's plans to rehabilitate and modernize the existing infrastructure, no change in land use, and no expected increase in environmental impact or risk. This allows GR Silver Mining to proceed with its plans for a Bulk Sampling Test Mining ("BSTM") program without having to produce a new MIA; only secondary permitting is required and is in process. Last year (see News Release dated September 9, 2025), SEMARNAT granted GR Silver Mining a key 5-year drill permit authorizing additional step-out and exploration drilling in the San Marcial Area of the Plomosas Silver Project. Interim President and Interim CEO Eric Zaunscherb noted, "It is essential that the Company maintain the trust of regulators at the State and Federal levels of Government as we advance the Plomosas Silver Project. The achievement of this most recent milestone is evidence that GR Silver Mining's permitting team is successfully doing so and delivering progress on behalf of shareholders. We are getting things done." The safety and security of the Company's employees and contractors is of paramount importance. Three rigs are currently active on the 20,000-metre San Marcial step-out drill program. The pivot earlier this year, establishing Durango as the base of operations for exploration, has allowed GR Silver Mining to advance the program while mitigating risk in a challenging region. The principal secondary road from Durango to the Project is currently being upgraded to facilitate faster supply and egress. The Company is targeting completion of its drill progr...

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