GR Silver Mining Drills New High-grade Ag Intervals at San Marcial SE Area

The Company has now completed all holes planned to be incorporated into the 3D geological model, with the updated resource estimation expected to be released in Q1|2023. A total of 75 GR Silver Mining drill holes (10,500 m) will be added to the 52 holes used in the 2019 NI 43-101 San Marcial mineral resource estimation.

• SMS22-09: Resource Area - down dip/plunge extension in the previous resource area
  5.6 m at 1,223 g/t Ag, 1.4% Pb and 1.2% Zn
  including 0.3 m at 26,150 g/t Ag, 30.0% Pb and 18.6% Zn
  SMS22-09 intersected mineralization textures similar to those in SMS22-10 at and below the San Marcial Breccia. At further depth, the hole encountered a 5.6 m zone of veining with high-grade Ag-Pb-Zn mineralization, including the highest-grade silver result to date from San Marcial - 26,150 g/t Ag over 0.3 m

• SMS22-22: SE Area - down dip extension from hole SMS22-16
  82.7 m at 121 g/t Ag
  including 0.4 m at 3,386 g/t Ag
  and 1.1 m at 1,391 g/t Ag
  SMS22-22 intersected mineralization similar to the previously announced SMS22-16 mineralization in the SE Area (Figure 1). SMS22-16 also contained multiple high-grade intervals, hosted in a wide zone of 123.1 m at 112 g/t Ag, with a predominance of Ag-rich hydrothermal breccias and stockworks

• SMS22-23: SE Area - 80 m step-out drilling from hole SMS22-22
  112.6 m at 61 g/t Ag
  including 0.9 m at 1,055 g/t Ag
  and 0.6 m at 14.3 g/t Au
  SMS22-23 was drilled outside the NE-trending corridor that hosts the SE Area discovery (Figure 1). It was also drilled 60 m down dip from SMS22-13 which did not report significant mineralization closer to surface. However, SMS22-23 has shown that the same style of Ag mineralization in the SE Area can be found outside the NE trending corridor, in subparallel structural corridors similar to hole SMS22-10. This is a significant revelation that opens up the exploration potential further to the southeast of the SE Area discovery, along the target contact zone and in other subparallel prospective structures. SMS22-23 also has a narrow high-grade gold zone - 0.6 m at 14.3 g/t Au - in the vicinity of the gold zone previously reported for SMS22-20 - 1.0 m at 31.3 g/t Au - opening up the exploration potential for narrow high-grade gold veins in the SE Area.

GR Silver Mining Chair and CEO, Eric Zaunscherb comments "As we close off the San Marcial database for the resource estimation scheduled this quarter, we are excited by the potential contribution of the new SE Area discovery. These most recent drill results contribute to our understanding of the mineralization at the SE Area as well as the original San Marcial Resource Area. San Marcial continues to deliver high-grade precious metal intervals within broad, well-mineralized masses. The discovery of high-grade Ag and Au mineralization outside, and to the SE, of the known structural corridor at the SE Area is highly encouraging. After delivery of the updated mineral resource, we will outline our strategic plan for 2023 and one can expect that the extension of exploration along this emerging and highly prospective SE trend will feature prominently."

All resource expansion drilling by GR Silver Mining, in the Resource Area and the new SE Area discovery, has now been completed, and all assays received. The 2022 program was the first drilling to be undertaken in the SE Area, and together with the Company's drilling programs between 2019-2021, represents successful completion of the program to expand the 2019 NI 43-101 mineral resource, also resulting in a discovery outside the previously reported San Marcial Resource Area.

A description of each drill hole and results are as follows:

SMS22-07 was designed to test for extensions to high-grade Au in the vicinity of the 1 m at 204.6 g/t Au intercepted in SM-19-01 (Figure 1). The drill hole is located at the NW end of the Resource Area where surface mapping indicates that NE-trending structures could have an association with Au mineralization. SMS22-07 intersected Au associated with Ag with values up to 0.40 g/t Au over 0.2 m in upper levels. Further work is required to understand the controls on high-grade Au at the NW end of the Resource Area. SMS22-07 also confirmed a NW-trending structure parallel to, and below, the San Marcial Breccia that returned 349 g/t Ag and 0.62 g/t Au over 0.4 m (Table 1) on the margins of an andesitic dyke.

SMS22-09 intersected similar textures to those in the SMS22-10 SE Area discovery hole on the contact of the San Marcial Breccia, down dip from high-grade mineralization in the Resource Area. However, at depth below that contact, the hole intersected a narrow, very high-grade vein containing 0.3 m at 26,150 g/t Ag with >30% Pb and 18.6% Zn. This E-W trending vein has been intercepted only in one other drill hole, SMS22-17, and opens up a new exploration target at depth that cross cuts the volcano-sedimentary unit.

SMS22-21 & SMS22-24 were planned to test mineralization at similar elevation to the mineralization intersected in the SE Area - between 625 m and 550 m elevation - down dip from the Resource Area. Drill hole SMS22-21 intersected similar breccias in chloritic facies of the volcano-sedimentary unit, but reduced Ag mineralization. SMS22-24, located approximately 100 m NW of SMS22-21, intersected the San Marcial Breccia but not the chloritic facies of the volcano-sedimentary unit indicating significant differences in control of the mineralization between the SE Area and the Resource Area, possibly related to N-S faults.

SMS22-22 was planned after successes with SMS22-16 and SMS22-12, which support continuity of high-grade mineralization down dip from SMS22-10 in the SE Area, to provide additional down dip extension to the mineralization and lateral continuity to SMS22-12. The 82.7 m at 121 g/t Ag intercept confirms the continuity and consistency of the mineralization with similar textures and similar high-grade (>1,000 g/t Ag) peaks within the broad zone of Ag mineralization.

SMS22-23 was drilled outside, and to the south of, the NE-trending (fault-bounded) corridor that hosts the SE Area discovery (Figure 2). It was also drilled 60m down dip from SMS22-13 which did not report significant mineralization closer to surface (see News Release dated September 7, 2022). However, SMS22-23 has shown that the same style of Ag mineralization in the SE Area can be found outside the NE trending corridor, in subparallel structural corridors similar to hole SMS22-10. This is a significant revelation that opens up the exploration potential further to the southeast of the SE Area discovery, along the target contact zone and in other subparallel prospective structures. SMS22-23 also has a narrow high-grade gold zone - 0.6 m at 14.3 g/t Au - in the vicinity of the gold zone previously reported for SMS22-20 - 1.0 m at 31.3 g/t Au - opening up the exploration potential for narrow high-grade gold veins in the SE Area.

The Company is now focused on completion of the 3D geological model and mineral resource estimation for the San Marcial and SE Areas, which will be combined with updated mineral resource estimates for the nearby Plomosas Mine Area and the San Juan-La Colorada Area into an integrated mineral resource estimate scheduled for completion in Q1|2023.

Table 1: San Marcial SE Area - Latest Results Highlights

Table 2: 2022 San Marcial Drill Program - SE Area Latest Drill Hole Details

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.

GR Silver Mining is a Canadian-based, Mexico-focused junior mineral exploration company engaged in cost-effective silver-gold resource expansion on its 100%-owned assets, located on the eastern edge of the Rosario Mining District, in the southeast of Sinaloa State, Mexico. GR Silver Mining controls 100% of two past producer precious metal underground and open pit mines, within the expanded Plomosas Project, which includes the integrated San Marcial Area and La Trinidad acquisition. In conjunction with a portfolio of early to advanced stage exploration targets, the Company holds 734 km² of concessions containing several structural corridors totaling over 75 km in strike length.

GR Silver Mining Ltd.
Eric Zaunscherb
Chair & CEO

This press release contains "forward-looking statements" within the meaning of applicable Canadian securities legislation and information that are based on the beliefs of management and reflect the Company's current expectations. When used in this press release, the words "estimate", "project", "belief", "anticipate", "intend", "expect", "plan", "predict", "may" or "should" and the negative of these words or such variations thereon or comparable terminology are intended to identify forward-looking statements and information. Such statements and information reflect the current view of the Company. Risks and uncertainties may cause actual results to differ materially from those contemplated in those forward-looking statements and information. By their nature, forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause our actual results, performance or achievements, or other future events, to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements.

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SOURCE GR Silver Mining Ltd.



Contact
Brenda Dayton, VP Corporate Communications, Telephone: +1.604.417.7952, Email: bdayton@grsilvermining.com