Pinnacle Defines High-Grade Gold-Silver Mineralization in Dos de Mayo Mine at El Potrero
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Pinnacle Defines High-Grade Gold-Silver Mineralization in Dos de Mayo
Mine at El Potrero
VANCOUVER, BRITISH COLUMBIA, September 09, 2025 (TSXV: PINN, OTC: PSGCF, Frankfurt:
P9J) – Pinnacle Silver and Gold Corp. ("Pinnacle" or the “ Company") is pleased to announce that
systematic underground channel sampling in the historic Dos de Mayo mine at the El Potrero Project in
Durango, Mexico is providing a good look at the gold- silver distribution within the known mineralized
zone. Fifty-three channel samples, in 13 composite channels, were taken within a raise (inclined tunnel
approximately 1.5 metres in diameter ) connecting two levels 25.5 metres apart. Composite assays up
to 11.2 grams/tonne gold (g/t Au) and 179 grams/tonne silver (g/t Ag) over 3.5 metres, 15.55 g/t
Au and 222 g/t Ag over 1. 1 metre and 11.93 g/t Au and 190 g/t Ag over 1.4 metres (see Table 1
below) were obtained, with individual assays up to 27.6 g/t Au and 366 g/t Ag over 0.6 metres. The
weighted average of mineralized composites within the raise assayed 6.43 g/t Au and 110 g/t Ag.
“As at the historic Pinos Cuates mine (see news releases for June 2 and July 22, 2025 ), the existing
underground workings at Dos de Mayo are giving us an important understanding of the nature of the
gold-silver mineralization at El Potrero,” stated Robert Archer, Pinnacle’s President & CEO. “ What we
are seeing is consistent with these low-sulphidation epithermal systems, where pockets of high- grade
mineralization (called “clavos” in Mexico) occur within a defined horizon, likely consistent with the
“boiling zone” of the hydrothermal fluids . At both mines, the ‘main’ level appears to have been the
haulage level as they are mostly unmineralized, although sporadic higher-grade assays were received.
Despite the lack of historic production records, it seems likely that the haulage level s were constructed
below, and outside of, the mineralized horizon.
It is important to note that sample lengths do not represent the width of the vein or the extent of the
mineralization. They are simply the composite lengths of the individual channels sampled end- to-end
and may be taken at any angle to the trend of mineralization, depending upon what is exposed
underground. While the systematic and close- spaced nature of the sampling does give a
representative characterization of the mineralization, the full extent of this particular clavo, as at Pinos
Cuates, is as yet unknown and will require drilling to determine.
On a larger scale, t he underground sampling is providing crucial information to better understand the
distribution of gold and silver mineralization such that we can correlate with the surface sampling within
the collective 500 metre strike length of the historic mines and then extrapolate along the entire 1,600
metre strike length that we have defined to date. We are currently in the planning stages for an
underground drilling program at all three main mines that will effectively be delineation drilling on a fairly
detailed scale. Further information on that will be released in due course.”
Of the 53 channel samples taken in the raise, grades ranged from 0.061 to 27.6 g/t Au and 8 to 366 g/t
Ag. An additional 146 channel samples were taken on the main level at Dos de Mayo and, as noted
above, values were mostly less than 1 g/t Au as this is considered to be outside of the mineralized
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horizon. On a sublevel, approximately 25.5 metres above, and connected to, the main level, 42
channel samples were taken, in 9 composites, highlighted by 10.99 g/t Au and 61 g/t Ag over 0.9
metres and 4.22 g/t Au and 40 g/t Ag over 0.6 metres. It is not yet fully understood how the sublevel
is positioned relative to the mineralized zone.
Table 1: Composite Channel Assays – Dos de Mayo Raise
Sample Numbers Composite No. Composite Length (m) Au g/t Ag g/t
EPUG25507-25510 2 2.0 7.27 63
EPUG25511-25514 3 1.9 2.02 50
EPUG25516-25518 and 25521-25523 4 2.9 4.95 116
EPUG25524-25529 5 3.2 6.43 119
EPUG25530-25532 6 1.8 6.23 106
EPUG25538-25539 8 1.7 2.08 45
EPUG25541-25543 9 2.6 2.15 58
EPUG25544-25549 10 3.5 11.20 179
EPUG25550-25551 11 1.3 4.95 100
EPUG25552-25553 12 1.1 15.55 222
EPUG25556-25557 13 1.4 11.93 190
All samples were assayed for gold, silver and a suite of 32 other elements, including copper, lead and
zinc. However, the base metal assays were consistently low, confirming that this is a precious metal
dominant system.
The Dos de Mayo mine is the southeasterly of three historic mines along a 500 metre strike length on
the Dos de Mayo vein system on the Potrero property. Underground sampling is now continuing at La
Dura mine to the northwest. The vein system has been traced on surface for 1,600 metres and there
are other parallel and splay veins that are being further defined and evaluated as the property has
never been systematically explored. The mine workings have now been accurately surveyed and
individual 3D models are being created for each mine in Leapfrog.
QA/QC
The technical results contained in this news release have been reported in accordance with National
Instrument 43- 101 Standards of Disclosure for Mineral Projects ("NI 43 -101"). Pinnacle has
implemented industry standard practices for sample preparation, security and analysis given the stage
of the Project. This has included common industry QA/QC procedures to monitor the quality of the
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assay database, including inserting certified reference material samples and blank samples into
sample batches on a predetermined frequency basis.
The systematic chip channel sampling was completed across exposed mineralized structures using a
hammer and m aul. The protocol for sample lengths established that they were not longer than two
metres or shorter than 0.3 metres . The veins tend to be steeply dipping to vertical, and so these
samples are reasonably close to representing the true widths of the structures. Samples were
collected along the structural strike or oblique to the main structural trend.
All samples were bagged in pre- numbered plastic bags; each bag had a numbered tag inside and
were tied off with adhesive tape and then bulk bagged in rice bags in batches not to exceed 40 kg.
They were then numbered, and batch bags were tied off with plastic ties and delivered directly to the
SGS laboratory facility in Durango, Mexico for preparation and analysis. The lab is accredited to
ISO/IEC 17025:2017. All Samples were delivered in person by the contract geologist who conducted
the sampling under the supervision of the QP.
SGS sample preparation code G_PRP89 including weight determination, crushing, drying, splitting,
and pulverizing was used following industry best practices where all samples were crushed to 75%
less than 2 mm, riffle split off 250 g, pulverized split to > 85% passing 75 microns (μm). All samples
were analyzed for gold using code GA_FAA30V5 with a Fire Assay determination on 30g samples
with an Atomic Absorption Spectography finish. An ICP -OES analysis package (Inductively Coupled
Plasma - Optical Emission Spectrometry) including 33 elements and 4 -acid digestion was performed
(code GE_ICP40Q12) to determine Ag, Zn, Pb, Cu and other elements.
Qualified Person
Mr. Jorge Ortega, P. Geo, a Qualified Person, and independent from Pinnacle, as defined by National
Instrument 43 -101, and the author of the NI 43 -101 Technical Report for the Potrero Project , has
reviewed, verified and approved for disclosure the technical information contained in this news
release.
About the Potrero Property
El Potrero is located in the prolific Sierra Madre Occidental of western Mexico and lies within 35
kilometres of four operating mines, including the 4,000 tonnes per day (tpd) Ciénega Mine (Fresnillo),
the 1,000 tpd Tahuehueto Mine (Luca Mining) and the 250 tpd Topia Mine (Guanajuato Silver).
High-grade gold-silver mineralization occurs in a low sulphidation epithermal breccia vein system
hosted within andesites of the Lower Volcanic Series and has three historic mines along a 500 metre
strike length. T he property has been in private hands for almost 40 years and has never been
systematically explored by modern methods, leaving significant exploration potential.
A previously operational 100 tpd plant on site can be refurbished / rebuilt and historic underground
mine workings rehabilitated at relatively low cost in order to achieve near -term production once
permits are in place. The property is road accessible with a power line within three kilometres.
Surface rights covering the plant and mine area are privately owned (no community issues).
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Pinnacle will earn an initial 50% interest immediately upon commencing production. The goal would
then be to generate sufficient cash flow with which to further develop the project and increase the
Company’s ownership to 100% subject to a 2% NSR. If successful, this approach would be less
dilutive for shareholders than relying on the equity markets to finance the growth of the Company.
About Pinnacle Silver and Gold Corp.
Pinnacle is focused on district-scale exploration for precious metals in the Americas. The high-grade
Potrero gold- silver project in Mexico’s Sierra Madre Belt hosts an underexplored low -sulphidation
epithermal vein system and provides the potential for near -term production. In the prolific Red Lake
District of northwestern Ontario, the Company owns a 100% interest in the past -producing, high-
grade Argosy Gold Mine and the adjacent North Birch Project with an eight -kilometre-long target
horizon. With a seasoned, highly successful management team and quality projects, Pinnacle Silver
and Gold is committed to building long-term, sustainable value for shareholders.
Signed: “Robert A. Archer”
President & CEO
FOR FURTHER INFORMATION CONTACT:
Email: [email protected]
Tel.: +1 (877) 271-5886 ext. 110
Website: www.pinnaclesilverandgold.com
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accepts responsibility for the adequacy or accuracy of this release.