GR Silver Mining Ltd. announce the final batch of underground drilling results from the Plomosas Mine Area as part of the 2022 infill and exploratory drilling program at the Company's wholly-owned Plomosas Project in Sinaloa, Mexico. The 28 drill holes being reported in this announcement were all drilled from within the historic Plomosas Mine Area, mainly above the 900 level, targeting the wide polymetallic Plomosas Breccia in unmined areas close to existing underground development and access. The infill drilling program achieved its objective to better delineate new mineralized zones and to replace un-sampled historical holes previously adopted in the 2021 resource estimation.

PLIP22-094: 21.7 m at 158 g/t Ag, 0.05 g/t Au, 1.9% Pb, 1.8% Zn and 0.1% Cu (301 g/t AgEq1) including: 5.8 m at 427 g/t Ag, 0.09 g/t Au, 4.9% Pb, 1.4% Zn and 0.1% Cu (648 g/t AgEq) PLIP22-092: 13.0 m at 161g/t Ag, 0.20 g/t Au, 1.0% Pb, 1.5% Zn and 0.1% Cu (273 g/t AgEq) PLIP22-089: 5.4 m at 325 g/t Ag, 0.54 g/t Au, 3.1% Pb, 2.5% Zn and 0.1% Cu (567g/t AgEq) including: 2.5 m at 524 g/t Ag, 0.19 g/t Au, 2.7% Pb, 0.8% Zn and 0.1% Cu (660 g/t AgEq) PLIP22-078: 4.7 m at 277 g/t Ag, 0.75 g/t Au, 7.5% Pb, 2.1% Zn and 0.2% Cu (666 g/t AgEq). The 186 drill holes (11,750 metres), completed by GR Silver Mining at the Plomosas Mine Area since the 2021 resource estimation, have added important core drilling in specific areas of the existing NI 43-101 resource block model, which together with 36,400 metres of historical drilling completed by First Majestic, Aurcana and IMMSA, provide a higher density and confidence of information for the resource estimation in progress. The Company has implemented QA/QC procedures which include insertion of blank, duplicate and standard samples in all sample lots sent to SGS de México, S.A. de C.V. laboratory facilities in Durango, Mexico, for sample preparation and assaying.

For every sample with results above Ag >100 ppm (over limits), these samples are submitted directly by SGS de Mexico to SGS Canada Inc. at Burnaby, BC. The analytical methods are four acid Digest and Inductively Coupled Plasma Optical Emission Spectrometry with Lead Fusion Fire Assay with gravimetric finish for silver above over limits. For gold assays the analytical methods are Lead Fusion and Atomic Absorption Spectrometry Lead Fusion Fire Assay and gravimetric finish for gold above over limits (>10 ppm).

The Qualified Person under National Instrument 43-101 Standards of Disclosure for Mineral Projects for this news release is Marcio Fonseca, P. Geo., President & COO for GR Silver Mining, who has reviewed and approved its contents.