GR Silver Mining Reports High-Grade Silver Intercepts in San Marcial Area Step-Out Drilling. SMS25-12 Returns 5.0 m at 232 g/t Ag, from 332.6m downhole, including 0.9 m at 956 g/t Ag
GR Silver Mining Reports High-Grade Silver
Intercepts in San Marcial Area Step-Out
Drilling. SMS25-12 Returns 5.0 m at 232 g/t Ag,
from 332.6m downhole, including 0.9 m at 956
g/t Ag
VANCOUVER, BC
,
Nov. 19, 2025
/CNW/ -
GR Silver Mining Ltd.
(
"
GR Silver Mining
" or the
"Company"
) (TSXV: GRSL) (OTCQB: GRSLF) (FRANKFURT: GPE) is pleased to announce
results from drill hole SMS25-12, extending the mineralization approximately 75 metres (m) below
the current San Marcial Resource Area ("Resource Area") (Figure 1) in the Plomosas Project. The
step-out drilling intersected two silver mineralized zones with multiple intervals of high-grade silver,
confirming the potential to expand the silver mineralization beyond the previous Resource Area
boundary (Figure 1) and remains open at depth.
Highlights of Step-Out Drilling at San Marcial
SMS25-12
intersected two distinct mineralized zones at shallow depth controlled by the
intersection of the NW-SE trending San Marcial breccia with N-S trending faults.
5.0 m
at 232 g/t Ag, from
332.6m
down hole, including
0.9 m
at 956 g/t Ag,
0.2 m
at 2,602 g/t Ag and
0.3 m
at 1,061 g/t Ag
8.8 m
at 121g/t Ag including
20 m
at 284 g/t Ag
SMS25-12
indicates continuity of the hydrothermal breccia structure for at least
400 m
below
surface. This bodes well for future resource expansion with another step-out drilling program
being planned for the first half of 2026.
High-grade silver values hosted by volcano-sedimentary units are creating additional drilling
targets at the footwall of chlorite-hematite rich breccias.
Multiple sets of N-S and NW-SE oriented structures are common in the San Marcial Area
creating prospective drill targets to guide the upcoming step-out drilling programs in 2026.
SMS25-11
intersected wide silver mineralization,
25 m
at 29 g/t Ag, suggesting that more
attractive silver mineralized zones may be hosted laterally to the recently reported SMS25-09
wide, high-grade intercept of
75 m
at 260 g/t Ag (see News Release dated
September 3, 2025
)
(Figure 2).
GR Silver Mining's President and CEO,
Marcio Fonseca
, commented,
"The recent success of step-
out drilling at the San Marcial Area in 2025 further strengthens our confidence in a large,
continuous silver-mineralized system at San Marcial. We are planning a significant step-out drilling
program in the first half of 2026 that could potentially double the existing silver mineralization
footprint to support resource growth at San Marcial."
Figure 1-Nov-19-2025 (CNW Group/GR Silver Mining Ltd.)
Table 1: SMS25-11 and SMS25-12 Drilling Highlights – 2025 Step-Out Drilling Program
Drill Hole
From
(m)
To
(m)
Type
Interval
(m)
Ag
g/t
Au
g/t
Pb
%
Zn
%
SMS25-11
382.8
407.4
Hydrothermal
Breccia &
Stockwork
24.6
29
0.01
0.1
0.1
(Incl)
390.3
399.2
Hydrothermal
Breccia &
Stockwork
8.9
49
0.02
NA
0.1
SMS25-12
300.7
310.3
Hydrothermal
Breccia
9.6
124
NA
0.1
0.2
(Incl)
307.3
309.3
Hydrothermal
Breccia
2.0
284
NA
0.1
0.5
332.6
337.6
Stockwork
5.0
232
0.02
NA
0.1
(Incl)
334.9
335.8
Stockwork
0.9
956
0.02
NA
0.1
Note:
Numbers may be rounded. Results are uncut and undiluted. True width not estimated as there is insufficient data from the new mineralized zones to determine the true
widths of the intervals with any confidence. NA = no significant result.
Step-out drilling completed at San Marcial in 2025 has confirmed the continuation of wide silver
mineralization, extending resource potential beyond the Resource Area (Figure 3). Hole SMS25-12
demonstrates the continuity of the silver mineralized system
150 m
beyond previous underground
drilling completed in 2021 (SMI21-04:
38 m
at 299 g/t Ag, including
3.5 m
at 1,002 g/t Ag, see
News Release dated
July 31
2022
) (Figure 2).
The confirmation of silver predominant mineralization, with low concentration of base metals, along
multiple N-S and NW-SE structures, provides additional targets for the upcoming step-out drilling
program planned for the first half of 2026 at the San Marcial Area (Figure 2). SMS25-12
demonstrates that the mineralization has continuity, not only in the chlorite-hematite hydrothermal
breccia but, also in the lower volcano-sedimentary unit where a quartz-calcite-sulfide veining with
silver is crosscutting early stage quartz-pyrite alteration, as shown in Figure 5.
SMS25-11, located
150 m
NW from SMS25-09, returned a wide intercept of
24.6 m
at 29 g/t Ag
indicating presence of wide silver mineralized zones hosted near major structures with intensive
hydrothermal alteration open for further investigation laterally and down-dip.
Figure2-Nov-19-2025 (CNW Group/GR Silver Mining Ltd.)
Figure3-Nov-19-2025 (CNW Group/GR Silver Mining Ltd.)
Figure4-Nov-19-2025 (CNW Group/GR Silver Mining Ltd.)
Figure5-Nov-19-2025 (CNW Group/GR Silver Mining Ltd.)
Table 2: 2025 San Marcial Step-Out Drill Program – Drill Hole Details
Drill Hole
Target
East (m)
North (m)
RL (m)
Dip (˚)
Azimuth (˚)
Depth
(m)
Results Status
SMS25-01
NW Extension
450685
2546064
914
-60
160
247.8
Abandoned
SMS25-02
NW Extension
450568
2546102
942
-55
135
206.0
Abandoned
SMS25-03
Parallel Breccia
450955
2545667
862
-60
135
206.0
Received
SMS25-04
Parallel Breccia
451045
2545757
860
-55
185
159.0
Received
SMS25-05
NW Extension
450791
2545967
892
-47
227
176.7
Received
SMS25-06
NW Extension
450797
2546016
895
-74
225
191.8
Received
SMS25-07A
Parallel Breccia
451145
2545641
795
-76
200
118.2
Received
SMS25-08
Parallel Breccia
451085
2545808
835
-65
175
244.5
Received
SMS25-09
SE Deep Extension
451506
2545924
700
-60
130
424.2
Received
SMS25-10A
Parallel Breccia
451506
2545924
700
-60
130
217.5
Received
SMS25-11
SE Deep Extension
451262
2545587
708
-81
143
407.35
Received
SMS25-12
SE Deep Extension
451313
2546012
799
-68
270
421.5
Received
SMS25-13
SE Deep Extension
451262
2545587
708
-62
280
383.0
Pending
Note: all holes drilled from surface; WGS84 Datum.
About the Plomosas Project
The Plomosas Project, including the recent high-grade silver discovery in the San Marcial SE Area,
is progressing in 2025 as an emerging high-grade silver district, located within the southwestern
edge of the Sierra Madre Occidental,
Sinaloa, Mexico
. The Plomosas Project covers 7,823 ha and
includes the historical Plomosas Underground Mine. The district contains intermediate to low-
sulfidation epithermal silver and gold mineralization, hosted in hydrothermal breccias and veins.
Recent success in exploration and drilling has delineated wide, high-grade, shallow hydrothermal
breccias in the San Marcial Area, including the SE Area discovery, where 2025 step-out drilling was
just completed. At the historical Plomosas Mine, operated by Grupo Mexico from 1985 to 2000,
underground sampling and metallurgical programs are being conducted to support future decisions
regarding the implementation of a Bulk Sampling Test Mining Program.
QA/QC Procedures
The Company has implemented QA/QC procedures, which include the 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 the limit), these samples are re-assayed by SGS de
Mexico
. Core samples are
represented by both HQ and NQ diameters and samples are represented by ½ core split of original
core. The analytical methods include four acid Digestion and Inductively Coupled Plasma Optical
Emission Spectrometry, with Lead Fusion Fire Assay and a 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).
Qualified Person
The Qualified Person under National Instrument 43-101 Standards of Disclosure for Mineral Projects
for this news release is
Marcio Fonseca
, P. Geo., President & CEO for GR Silver Mining, who has
reviewed and approved its contents.
About GR Silver Mining Ltd
.
GR Silver Mining is a Canadian-based,
Mexico
-focused 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 km² of
highly prospective, advanced-stage exploration concessions position the Company well for resource
expansion at the Plomosas Project.
GR Silver Mining Ltd.
Márcio Fonseca, President & 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.
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For further information, please contact: Telephone: +1 236-270-2057,
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CO: GR Silver Mining Ltd.
CNW 06:00e 19-NOV-25