# GR Silver San Marcial July 2026 Drill Results
Source Brief: https://evesgoldminers.com/research/source-briefs/gr-silver-mining-ltd-2026-07-10-gr-silver-san-marcial-july-2026-drill-results-39e00c86
Original source: https://grsilvermining.com/wp-content/uploads/2026/07/gr-silver-san-marcial-drill-results-july-2026.pdf
Original published: 2026-07-10
EGM generated: 2026-09-27
Company: GR Silver Mining Ltd. (GRSL)
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# GR Silver San Marcial July 2026 Drill Results
Source: https://grsilvermining.com/wp-content/uploads/2026/07/gr-silver-san-marcial-drill-results-july-2026.pdf
Published: 2026-07-10T00:00:00+00:00
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## Content
# GR Silver San Marcial July 2026 Drill Results
Source: https://grsilvermining.com/wp-content/uploads/2026/07/gr-silver-san-marcial-drill-results-july-2026.pdf
Published: 2026-07-10
July 10, 2026
## GR Silver Reports Significant Drill Results at San Marcial: 21.9 m at 168 g/t Ag including 6.15 m at 447 g/t Ag in the SE Area
**Vancouver, BC
GR Silver Mining Ltd.** (**
GR Silver Mining
or the
Company
**) (TSXV: GRSL; OTCQX:
GRSLF; FRANKFURT: GPE) is pleased to announce positive drill results from the resource expansion drilling
program at the San Marcial Area in the Plomosas Project, Mexico. Diamond drilling on the SE Extension target
confirms the extension of high-grade silver mineralization for least an additional 150 metres to the southeast of
the 2023 NI 43-101 Mineral Resource Estimate (
) boundary.
The drill hole results reported in this release represent two separate target areas: 1) the SE Extension target,
looking to expand the existing MRE to the southeast along the main, breccia-hosted structures; and 2) the Parallel
Breccia target, which aims to understand the nature of prospective newly identified mineralized structures in the
vicinity of the MRE (Figure 1).
## Highlights of Latest Step-Out Drilling at San Marcial
**SMS26-07** intersected two distinct mineralized zones in the **SE Extension target**. The upper zone is
hosted within chlorite
hematite-rich breccias at the contact between the upper Oligocene volcanic
sequence and the lower Jurassic volcano-sedimentary sequence, while the lower zone occurs within
hydrothermal breccias and stockwork systems developed in the lower Jurassic volcano-sedimentary
sequence. The presence of mineralization in both horizons further supports the interpretation of a laterally
extensive hydrothermal system and reinforces the exploration potential of the SE Area of San Marcial.
o **21.9 m true width (
) at 168 g/t Ag and 1.41% Zn, from 191.5 m down hole**
including 6.15 m TW at 447 g/t Ag and 0.85% Zn
**SMS26-08** intersected a near-surface mineralized zone composed of quartz
calcite
tourmaline
stockwork veinlets developed at the intersection with a NE
SW-trending structure. At depth, the hole
intersected the NW
SE-trending **Parallel Breccia**, which hosts low-to moderate-grade gold
mineralization, further supporting the structural control and continuity of the mineralizing system.
o **2.85 m TW at 340 g/t Ag and 0.32 g/t Au, from 63.0 m down hole**,
including 1.75 m TW at 450 g/t Ag and 0.37 g/t Au
o **0.75 m TW at 5.34 g/t Au from 195.0 m down hole**
GR Silver Mining
s President and CEO, Eric Zaunscherb, commented, *
The results from two new resource*
*expansion areas at San Marcial demonstrate the continued effectiveness of our 20,000-metre drilling program*
*and reinforce our confidence in the exploration potential of both the Southeastern Extension and the Parallel*
*Breccia. We look forward to further advancing these targets as we continue to better define and expand the*
*mineralized system. As the program advances, new data will allow us to follow up on higher-grade features like*
*the dilation zone intersected in Hole SMS26-04 in the SE Area, which returned 45.1 m estimated true width at*
*1,623 g/t Ag, including 8.25 m TW at 8,579 g/t Ag (see* News Release *dated May 19, 2026).
**Figure 1 Location of San Marcial Step-Out Drill Holes SMS26-06 and SMS26-07 in SE Area and**
**SMS26-02, SMS26-05 and SMS26-08 in Parallel Breccias Area**
GR SILVER MINING LTD
Leyend
Resources & Drilling
2023 Resource Area
NI 43-101 2023 Resource Drillholes
Post MRE Drilling (2023 & 2025)
2026 Resource Expansion
SE & Central Area
Parallel Breccias
Drilling & Assay Results Status
Drilling Pending
Drilled - Assays Received
Drilled - AssaysPending
Central Area
SMS22-24
SMS22-39
SE Extension
SMS22-01
SMS22-02
SMS24-45
SMS24-07A
NW Fault
Parallel Breccias
Stratigraphic Units
Upper Igneimbrites
Green Hydrothermal Breccia
Andesitic Dikes
Diorite Intrusive
Andesite to Dacite Flows and Tuffs
Granodiorite intrusive
Lower Volcanosedimentary Unit
Ground Geophysics
Chargeability Anomaly Contour
Southwestern Edge
Sierra Madre Occidental
0 250 500 m
## SE Extension Target
Results from drill holes SMS26-06 and SMS26-07 confirm the extension of high-grade silver mineralization within
the chlorite
hematite hydrothermal breccias hosted at the contact between the upper Oligocene volcanic
sequence and the lower Jurassic volcano-sedimentary unit. These results increase confidence in the exploration
potential of the southeastern extension of the San Marcial system, which will continue to be tested as part of the
ongoing 20,000-metre step-out drilling program. The successful intersection in SMS26-07 of 21.9 m at 168 g/t Ag
(Table 1) validates the current exploration model by confirming the continuity of the mineralized zone first identified
during the 2023 step-out drilling program. This continuity is supported by drill hole SMS23-02, which intersected
11.1 m at 584 g/t Ag, including 0.2 m at 14,365 g/t Ag (see News Release dated May 16, 2023), and drill hole
SMS23-03, which returned 35.2 m at 134 g/t Ag, including 0.9 m at 1,412 g/t Ag (see News Release dated June
14, 2023). These results demonstrate the continued lateral extension of the high-grade silver system, confirm the
extension of high-grade silver mineralization for least an additional 150 metres to the southeast of the MRE
boundary, and support further expansion drilling towards the southeast (Figure 2).
**Table 1: SMS26-06 and SMS26-07 Highlights
2026 Step-Out Drilling Program
SE Extension**
| Drill Hole | From (m) | To (m) | Mineralization Type | Apparent width (m) | True width (m) | Ag g/t | Au g/t | Pb % | Zn % |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| SMS26-06 | 105.6 | 107.1 | Hydrothermal Bx | 1.5 | 1.45 | 184 | 0.03 | NA | 0.1 |
| SMS26-06 | (Incl) 106.25 | 106.65 | Hydrothermal Bx | 0.4 | 0.38 | 501 | 0.03 | 0.1 | 0.2 |
| SMS26-06 | 160.5 | 173.15 | Hydrothermal Bx & Stockwork | 12.65 | 12.25 | 57 | 0.23 | NA | NA |
| SMS26-06 | (Incl) 160.5 | 162.6 | Stockwork | 2.1 | 2.05 | 100 | 0.39 | 0.1 | 0.1 |
| SMS26-07 | 191.5 | 213.8 | Hydrothermal Bx | 22.3 | 21.9 | 168 | 0.08 | 0.5 | 1.4 |
| SMS26-07 | (Incl) 201.6 | 207.95 | Hydrothermal Bx | 6.35 | 6.15 | 447 | 0.09 | 0.3 | 0.9 |
| SMS26-07 | (Incl) 207.95 | 212.15 | Hydrothermal Bx | 4.2 | 4.15 | 159 | 0.23 | 2.0 | 5.8 |
*Note: Numbers may be rounded. Results are uncut and undiluted. True sample widths are based on crosscutting angles in*
*core, structural measurements, and intersections for drill holes immediately above and below (down dip).*
*NA = no significant result. Bx = breccia.*
**Figure 2: Longitudinal Section: SMS26-06 and SMS26-07
Potential Resource Expansion**
83.2m @ 215 g/t Ag SMS22-20
101m @ 308 g/t Ag SMS22-10
4.2 m @ 466 g/t Ag SMS23-01
38 m @299 g/t Ag SMS21-04
5.0 m @ 232g/t Ag SMS25-12
5.7 m @ 513 g/t Ag SMS23-05
45.1 m @ 1,623 g/t Ag SMS26-04
75 m @ 260 g/t Ag SMS25-09
MRE -2023
Block Model
500 g/t Ag
300 g/t Ag
150 g/t Ag
Planned Resource Extension Area
2023 MRE Drilling
Post MRE 2023
2026 Planned Drilling (Pierce Point Fase 1)
2026 Planned Drilling (Pierce Point Fase 2)
2026 Competed Drillholes
## Parallel Breccia Target
Drilling in the Parallel Breccia target (Figure 1) was designed to better understand the nature of prospective new
mineralized structures in the vicinity of the MRE. Mineralization intersected in holes SMS26-02, SMS26-05 and
SMS26-08 (Table 2), comprises multistage hydrothermal breccias, stockwork, and vein systems hosted within the
lower Jurassic volcano-sedimentary sequence. Mineralizing events are structurally controlled by the intersection
SE and NE
SW structural trends and are characterized by quartz
calcite
tourmaline veins containing
abundant pyrite, silver sulfides, galena, and sphalerite, locally associated with low- to moderate-grade gold
anomalies. Wall-rock alteration indicates a transition from high-temperature alteration assemblages,
characterized by K-feldspar and tourmaline
albite halos proximal to diorite and granodiorite intrusions, to quartz
pyrite and chlorite
calcite assemblages developed adjacent to the vein and stockwork zones.
**Table 2: SMS26-02, SMS26-05 and SMS26-08 Highlights
2026 Step-Out Drilling Program
**Parallel Breccia Target**
| Drill Hole | From (m) | To (m) | Mineralization Type | Apparent width (m) | True width (m) | Ag g/t | Au g/t | Pb % | Zn % |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| SMS26-02 | 73.00 | 99.80 | Stockwork | 26.80 | 26.80 | 6 | 0.14 | NA | NA |
| SMS26-02 | 119.35 | 128.50 | Hydrothermal Bx & Stockwork | 9.15 | 9.15 | 28 | 0.03 | NA | 0.2 |
| SMS26-05 | 52.45 | 53.30 | Stockwork | 0.85 | 0.80 | 116 | 0.23 | NA | NA |
| SMS26-08 | 18.60 | 18.90 | Stockwork | 0.30 | 0.30 | 306 | 0.23 | 0.1 | 1.2 |
| SMS26-08 | 63.00 | 66.00 | Quartz-Calcite- Sulfides Vein | 3.00 | 2.85 | 340 | 0.32 | 0.2 | 0.6 |
| SMS26-08 | (Incl) 64.25 | 66.00 | Quartz-Calcite- Sulfides Vein | 1.75 | 1.70 | 450 | 0.37 | 0.2 | 0.5 |
| SMS26-08 | 195.00 | 195.75 | Stockwork | 0.75 | 0.75 | 8 | 5.34 | NA | NA |
*Note: Numbers may be rounded. Results are uncut and undiluted. True sample widths are based on crosscutting angles in*
*core, structural measurements, and intersections for drill holes immediately above and below (down dip).*
*NA = no significant result. Bx = breccia.*
## Discussion
Comparing SMS26-06 and SMS26-07 with the 2023 step-out drill holes SMS23-02 and SMS23-03 confirms a
continuous silver-mineralized zone located at the contact between the upper Oligocene volcanic sequence and
the lower Jurassic volcano-sedimentary unit. In addition, drilling in the SE Area demonstrates that economically
significant mineralization is also developed within the lower Jurassic volcano-sedimentary sequence which
enhances the exploration potential of the area, indicating favourable conditions for the discovery of additional
mineralized structures within the Jurassic package, with the potential for increased mineralization density and
grade toward intrusive bodies (Figures 3 and 4).
The multi-stage hydrothermal breccias and stockwork zones in SMS26-06 and SMS26-07 exhibit multiple
brecciation and mineralization events, indicating repeated hydrothermal fluid circulation and remobilization of
economic silver and polymetallic mineralization from the Jurassic through the Cretaceous and into the Oligocene.
This prolonged hydrothermal activity, combined with favourable structural traps, created optimal conditions for the
development and preservation of high-grade mineralized shoots (Figure 5).
**Figure 3: Cross Section (see Figure 1)
SMS26-06 and SMS26-07 in SE Area**
SMS26-06
SMS26-07
Andesite
Dacite
LEGEND
Geology & Structures
Pid othema Breccia
Green Breccia
Parallel Breccia
Lafaye
SMS26-06
1.45 m @ 184 g/t Ag
Incl. 0.38 m @ 501 g/t Ag
12.25 m @ 57 g/t Ag
Incl. 2.05 m @ 100 g/t Ag
Drill holes
Post MIB (Drilling (2017) & 2019)
2026-ongoing drillings
This New Reliance (SMS26-06 & 07)
Resources & Intercepts
Mineral and Zone Book Intercepts
43 - 01 Reservoir Boundary (2023)
Geophysics
Changing by Anomaly
SMS26-07
21.90 m @ 168 g/t Ag
Incl. 6.15 m @ 447 g/t Ag
Incl. 4.15 m @ 159 g/t Ag
7.30 m @ 47 g/t Ag
GR SILVER MINING LTD
Granodiorite
Diorite
Parallel Breccia
Laminar Cracks
Volcanosedimentary Unit
**Figure 4: Cross Section (see Figure 1): Parallel Breccia Target - SMS26-05 and SMS26-08 -**
**with SMS22-01, SMS22-21 and SMS22-09 in the Chlorite-Hematite Hydrothermal**
**Breccia.**
SMS26-08 SMS26-05
Dacite
Diorite
Andesite
SM
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