GR Silver Mining Ltd. announced infill drilling results that make up part of the resource update program in progress at the Plomosas Mine Area, Plomosas Project in Sinaloa, Mexico. These drill holes were targeted by the Company to replace historical holes used in the 2021 NI 43-101 mineral resource estimate, where zero values were assigned, or to test new near-surface and underground high-grade Ag-Au mineralized zones, identified in the recent underground sampling/mapping program. The infill drilling program is continuing in the Plomosas Mine Area through the latter part of 2022, in anticipation of an updated resource estimate in first quarter 2023.

The Company's underground drilling and mapping program, currently in progress in the Plomosas Mine Area, has identified un-mined zones that will be incorporated into the upcoming resource estimate, as well as better delineating the precious metals-rich stockwork zones located on the hanging wall of the hydrothermal breccia and often associated with NW-trending fault zones. Since completion of the NI 43-101, the Company has added 4,946 m of drilling at the Plomosas Mine Area. This represents a significant addition of results still to be incorporated into the upcoming resource model and estimate.

Plomosas Mine Area – Update Geological Modelling – Drilling Results to Date: A review of all geological information together with additional mapping and sampling, as well as drilling, in the underground workings at the Plomosas Mine Area has revealed positive outcomes allowing the Company to progress to more detailed 3D modelling of the mineralized zones. Historical mine production to 2001, was concentrated along the principal Ag-Au-Pb-Zn mineralized hydrothermal (Plomosas) breccia. The information collected by the Company during the past 12 months has indicated that not only are there zones with well-preserved precious and base metal-rich hydrothermal breccias, but also well defined, wide Ag-Au only stockwork zones on the hanging wall of the hydrothermal breccia.

The Ag-Au stockwork zones are generally hosted between NE oriented fault offsets (or jogs) close to, or hosted by, rhyolitic tuffs. They represent wide zones developed within a pinch and swell geometry. The historical mine operations did not fully investigate or extract these zones, concentrating primarily in the high-grade Pb-Zn hydrothermal breccia zones.

New occurrences of the main hydrothermal breccia have been discovered with the infill drilling program in underground areas where there was a lack of information or development by previous companies. The infill drilling program is also improving the definition of the boundaries of a broad Pb-Zn mineralized zone, commonly surrounding all other mineralized domains. These broad Pb-Zn rich zones, such as defined by PLS22-08 (21.2 m at 2.1% Pb and 1.3% Zn), strengthen the potential for definition of multiple mineralized zones in the Plomosas Mine Area in the vicinity of the existing underground development.

The infill drilling program in the deeper levels of the underground workings is evaluating continuity of high-grade Au mineralization. Recent results such as PLIP22-28 (7.3 m at 55 g/t Ag, 8.66 g/t Au, 2.7% Pb, 6.6% Zn and 0.5% Cu, including 0.3 m at 190 g/t Ag, 44.4 g/t Au, 1.3% Pb, 2.1% Zn and 1.0% Cu), support the presence of a Au-enriched mineralized source associated with a stockwork zone hosted at the intersection of NW and E-W faults, immediately below the historic Plomosas Mine Area. The Company has completed a total of 4,946 m of drilling (96 holes) to date in the Plomosas Mine Area, and is expecting to complete an additional 4,200 m by year end, when all data will be integrated in the upcoming mineral resource estimate.

The following are the infill drilling results highlights to date. GR Silver Mining reports that all five nominees listed in the management information circular dated August 2, 2022 (the "2022 Information Circular") for the 2022 Annual General & Special Meeting ("AGM") of shareholders held on September 6, 2022, in Vancouver, B.C., were re-elected as directors of the Company. A total of 69,929,831 common shares of GR Silver Mining were represented at the AGM, representing 35.82% of the Company's outstanding common shares as at the record date of August 2, 2022.

Shareholders voted in favour of all matters brought before the meeting, including re-appointing Davidson and Company LLP as the Company's auditors and approving the Company's new Omnibus Long-Term Incentive Plan (the "Omnibus Plan").