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GR Silver Mining Announces Resumption of Plomosas Silver Project Field Work

Exploration Programs

GR Silver Mining Announces Resumption of

Plomosas Silver Project Field Work

VANCOUVER, BC

,

May 20, 2025

/CNW/ -

GR Silver Mining Ltd.

("

GR Silver Mining

" or the

"

Company

") (TSXV: GRSL) (OTCQB: GRSLF) (FRANKFURT: GPE) – is pleased to announce the

resumption of field work including drilling on the Plomosas Silver Project in

Sinaloa, Mexico

. Although

there had been no incidents of violence on the Company's properties and no threats to the Company

or its employees or consultants in accessing our Project, management had decided to temporarily

pause field work (

news release,

April 29, 2025

) to allow time for the considerable efforts of the

Government of

Mexico

to increase security and stability in the project region.

President and Chief Operating Officer, Márcio Fonseca, noted, "The security situation in the project

region appears to have stabilized based on our observations on site and in extensive discussions

with members of our community and various levels of Government. We are grateful to these

stakeholders for their efforts to improve conditions. Our highly experienced in-country team has

expressed confidence in the current situation and their ability to safely return to active field

exploration. We are very excited to resume sampling and drilling the prospective targets we have

outlined. The exploration team has returned to activities on site prioritizing surface investigations,

prior to conducting step out drilling of high-grade silver results returned from some previous trench

sampling in the NW and SE Extensions of the current NI 43-101 resource."

Previous surface exploratory trench results include:

NW Extension -

56 m

at 196 g/t Ag, including

15 m

at 472 g/t Ag, (

news release,

February 21, 2019

).

New Hydrothermal Breccias (Subparallel Breccias),

12 m

at 323 g/t Ag within a broader zone of

24 m

at 219 g/t Ag, including high-grade Ag up to

1 m

at 974 g/t Ag, (

news release,

May 22, 2019

).

Management believes that these previous results provide further encouragement for potential

expansion of the resource with planned step out drilling.

On

March 3

(

news release

), the Company announced the commencement of a step-out drilling

program aiming to expand the San Marcial mineralization footprint by as much as 350 meters

northwest from the current NI 43-101 resource area, as well as test potential new parallel zones

located immediately to the southeast of the current NI 43-101 resource area. The Company has

completed surface evaluation along 500 meters of strike length, focused on a prospective geological

contact with evidence of silver mineralization and seeking blind targets highlighted in Figure 1. Initial

field results indicate new prospective drilling targets along this potential mineralization footprint

extension.

Noting that the safety of our employees, consultants, suppliers, and community members remains

paramount, management considers it prudent to resume this program while vigilantly monitoring the

situation.

Management continues its assessment of and potential implementation of a Bulk Sampling Test

Mining program at the permitted former Plomosas Mine, similar to the previously announced

successful program completed at the historical San Juan Mine, benefiting from existing permits and

infrastructure on site, and explore opportunities to achieve critical mass in the Mexican silver mining

industry.

About GR Silver Mining Ltd

.

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 the Plomosas Project, including the former Plomosas underground mine and wide,

high-grade silver mineralized zones at the San Marcial Area. Recent discoveries in the 78 km

2

of

highly prospective advanced stage exploration concessions, position the Company well in the pursuit

for resource expansion at the Plomosas Project.

Figure 1 – Location of the NW and SE Extension Zones, as well as drilled and planned drill collars

(CNW Group/GR Silver Mining Ltd.)

GR Silver Mining Ltd.

Eric Zaunscherb, Chair & CEO

Cautionary Statement Regarding Forward-Looking Information

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.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is

defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy

or accuracy of this press release.

SOURCE

GR Silver Mining Ltd.

View original content to download multimedia:

http://www.newswire.ca/en/releases/archive/May2025/20/c6503.html

%SEDAR: 00040149E

For further information:

For further information, please contact: Eric Zaunscherb, Telephone:

+1.647.293.8457, Email: [email protected]

CO: GR Silver Mining Ltd.

CNW 07:30e 20-MAY-25