GR Silver Mining Ltd. announced the delivery of initial NI 43-101 mineral resource estimates on the Company's Plomosas Project ("Plomosas"), located in Sinaloa, Mexico. Indicated Resources:10.3 Moz AgEq - 3.4 Moz Ag, 53 koz Au, 73 Mlbs Zn, and 48 Mlbs Pb; Inferred Resources:21.0 Moz AgEq - 8.6 Moz Ag, 85 koz Au, 149 Mlbs Zn, and 116 Mlbs Pb; The incorporation of extensive historical data and completion of the initial resource estimates at the Plomosas Project ("Plomosas") incremental to the nearby San Marcial NI 43-101 mineral resource estimate of 36.0 Moz AgEq# Indicated resources and 11.9 Moz AgEq# Inferred resources, represents a major milestone for GR Silver Mining; Estimates include 80 new drill holes and 476 historic drill holes representing a total of 100,672 m of drilling covering two areas, the former Plomosas Mine and the San Juan area; The present resource included a sampling of historical drill holes completed by previous companies that was frequently selective, resulting in a large amount of drill core unsampled; this core is no longer available. Unsampled intervals within mineralized zones were assigned zero values for the resource estimation, including in areas with evidence of precious and base metals mineralization. Further drilling will address these blank spots to potentially continue resource growth at the Plomosas Mine and San Juan areas; A 14,000m drill program employing seven rigs is in progress on newly identified, high priority Au–Ag targets outside the current resource areas. Data representing 556 core drill holes; 80 new drill holes and 476 historic drill holes - together with geological reconnaissance, underground mapping, and detailed geological mapping on surface, have proved valuable components to delineate an extensive precious metal-rich system. Drill core from recent surface and underground resource drilling followed strict QAQC protocols and is stored on site at the project core storage facilities. Historical drill holes feature historical documentation and field evidence of drill hole collars to support full integration of both datasets. Validation drilling was completed at the Plomosas Mine and San Juan areas, with the Company drill testing some historical surface and underground drill sites in 2020 and 2021. These tests validated geochemical assay reports of mineralized zones previously intersected by historic diamond core drilling. Sampling of historical drill core by previous companies was frequently selective with sampling only performed on specific core intervals, leaving many unsampled intervals within mineralized zones. Nearby underground geological investigations and channel sampling demonstrated that many of these unsampled intervals feature precious and base metal mineralization. For the purposes of the resource estimate, these unsampled intervals between mineralized zones have been conservatively assigned zero values by GR Silver Mining, which likely results in underestimation of grade for portions of the resource model. Further drilling will address this situation to potentially continue resource growth at the Plomosas Mine and San Juan areas. The entire dataset has been recently surveyed, including detailed laser surveying of all underground workings. There are at least two distinct mineralizing events identified at the Plomosas Mine to date. The principal structure at the Plomosas Mine is the Plomosas Breccia, a low-angle N-S trending fault breccia ("Plomosas Fault"), which hosts the primary precious and base metal mineralized zone. This structure has a general dip angle of 30° to 40° to the west with dilatational features and wide mineralized sections that are between one and eight meters thick. Mineralization in the Plomosas Breccia is principally by replacement of pre-existing fault breccia and in the original wall rocks. Precious metal-rich epithermal veins are hosted by steep NW-SE, N-S and NE-SW trending faults that crosscut the Plomosas Fault and commonly define high-grade zones by later enrichment at the intersections with, or proximal to, the Plomosas Breccia. In parts, precious metal mineralization is found in contact breccias of intrusive rhyolite and diorite dykes. These late precious metal-rich mineralized zones are at a preliminary stage of exploration with only limited data incorporated into the 3D model to date. Further drilling is warranted to better define its full potential. At the San Juan area, two veins were modelled based on shallow surface-only core drilling, namely the mineralized San Juan and La Colorada veins. The San Juan vein is hosted in a low-angle north-south trending fault breccia ("San Juan Fault") generally dipping at an angle of 40° to 50° to the east. The polymetallic silver-gold rich mineralization has a much narrower geometry than that observed at the Plomosas Mine. Similar to the Plomosas Mine, there is evidence supporting the presence of several precious metal-rich mineralized zones, which are at an early stage of modelling at San Juan. The La Colorada vein is hosted in a low-angle north-south trending fault ("La Colorada Fault") parallel to the San Juan Fault. Preliminary wide spaced surface core drilling has defined a predominantly gold-silver hydrothermal vein breccia. The precious metal-rich zones recently identified in the geological models at both the Plomosas Mine and the San Juan areas have emerged as the primary focus of the current exploration drilling program, concentrating on targets and geological settings where there are indications of favorable geology for additional discoveries. The mineral resource estimates for the Plomosas Mine and San Juan areas were provided by Dr. Gilles Arseneau, P.Geo. of ARSENEAU Consulting Services Inc. (ACS) using Geovia Gems Version 6.8.4. The Plomosas Mine mineral resources were estimated by ordinary kriging into 5m cube blocks, and the San Juan mineral resources were estimated by the Inverse Distance Squared method. Grades were capped prior to compositing to 1 m. Block grades were estimated in three successive passes for the Plomosas Mine and four passes for the San Juan area. The historical Grupo Mexico drill holes were only used for passes two and three at the Plomosas Mine and for passes three and four at the San Juan area. Blocks estimated with Grupo Mexico drill holes were all classified as inferred mineral resources. Blocks estimated during Pass 1 with at least two drill holes or Pass 2 at San Juan, with at least four drill holes, were classified as Indicated.