G Mining Ventures Reports New High-Grade Discovery at Oko West and Extension of Mineralization at Gurupi
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G Mining Ventures Reports New High-Grade Discovery at Oko West and
Extension of Mineralization at Gurupi
BROSSARD, QC, September 9, 2025 – G Mining Ventures Corp. (“GMIN” or the “Corporation”) (TSX:GMIN,
OTCQX:GMINF) is pleased to provide an exploration update, including significant exploration results from
its Oko West Gold Project (“Oko West”) in Guyana and its Gurupi Project (“Gurupi”) in Brazil.
(All grade reported as grams per tonnes of gold “g/t Au” and length in meters “m”.)
Key Highlights at Oko West
At Oko West, recent drilling guided by a newly developed Splay Model along the main mineralized zone
have delivered high grade intercepts, confirming both near -mine growth and regional discovery potential
(Figures 1 to 3; Table 1). Recent drilling has returned:
o The discovery of the second high grade plunge of mineralization beyond the current pit limits to the
north at Oko West in Block 1 (“B1”), including:
• 2.9 m at 37.85 g/t Au (OKWD25-518)
• 21.0 m at 3.80 g/t Au (OKWR25-1839)
• 14.0 m at 4.38 g/t Au (OKWD25-533)
• 15.5 m at 3.53 g/t Au (OKWD25-533)
o Development of a mineralized Splay Model within the principal mineralized zone, capturing the
structural complexity of the main shear system and delineating vectors for exploration potential
beyond the current reserve pit. Results include:
• 11.9 m at 5.26 g/t Au (OKWD25-545)
• 14.0 m at 1.10 g/t Au (OKWD25-516)
Key Highlights at Gurupi
Since acquiring Gurupi at the end of 2024, the Corporation has made progress in advancing permitting while
restarted field exploration work to prepare for the launch a robust exploration drilling program across its
highly prospective land package (Figures 5 to 7; Table 2). Key results from trenching include:
o Extension of the known mineralization 2 km north of Chega Tudo deposit at the Grodiocal target
with trenches including:
• 9.0 m at 3.52 g/t Au (GMAMT-25-008)
• 3.0 m at 3.63 g/t Au (GMAMT-25-005)
• 3.0 m at 2.09 g/t Au (GMAMT-25-001)
• 7.0 m @ 0.97 g/t Au (GMAMT-25-005)
• 5.0 m @ 0.89 g/t Au (GMAMT-25-001)
o Relaunch of regional exploration program at Gurupi with expected drilling in Q4-2025.
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“Exploration at Oko West continues to expand our understanding of the deposit and reinforces the robust
economics demonstrated in the Feasibility Study , while at Gurupi, trenching results validate near -surface
mineralization, demonstrating the high prospectivity of the large land package” said Julie -Anaïs Debreil, Vice
President Geology & Resources . “High-grade intercepts confirm Oko West’s exceptional potential and support
future mine life extensions. At Gurupi recent work provide the confidence to launch our first drill program later this
year. Combined with Tocantinzinho’s robust cash flow, our pipeline of high-quality projects firmly positions GMIN
to become the next intermediate gold producer.”
Oko West Project, Guyana
New Ore Shoot Discovery
Since the completion of Feasibility Study (“FS”) drilling , the Corporation has completed an additional 9,968
m of core drilling focused on exploring mineralized extensions outside the known reserve. Results to date
have led to the discovery of the second high grade plunge of mineralization beyond the current pit limits to
the north (B1, Figure 1). This newly discovered plunge starts near surface and outside of the existing pit, and
contains grades that could be easily integrated into the existing open pit and underground mine plan (Figure
2). This new ore shoot discovery demonstrates that the Oko West Deposit continues to grow.
Splay Model Success
Drilling also aimed to confirm a newly developed Splay Model , based on detailed structural observations
(Figure 3). The Splays are smaller structures that branch off a main shear zone, acting like natural off-ramps
that redirect stress and mineral -rich fluids into the surrounding rock. These offshoots can form highly
prospective zones for exploration . The Splay Model integrates validated structural insights , providing a
framework to better target mineralization occurring outside the main vein systems . The modelled veins
present in the pit add mineralization to the model outlined in the FS, decreasing the strip ratio of the deposit
during the mining phase.
The purpose of this model revision is to better target mineralization around the pit. This has proven to be
successful with several veins demonstrating continuity outside of the known pit ( Figure 3).
Highlights of intercepts include the following listed below, with details provided in Table 1.
• 11.9 m at 5.26 g/t Au (OKWD25-545, AU_2FW)
• 14.0 m at 1.10 g/t Au (OKWD25-516, ODZ)
• 7.0 m at 2.08 g/t Au (OKWD25-545, AU_3HW)
• 5.0 m at 2.22 g/t Au (OKWR25-1838, Splay_FW2) * reverse circulation (“RC”) drilling hole
• 6.1 m at 1.73 g/t Au (OKWD25-528, CTZ)
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Figure 1 - Longitudinal view of the Oko West Deposit
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Figure 2 - Isometric view of 2025 drilling outside of the FS reserve pit
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Figure 3 - Isometric view of the Splay Model
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Regional Exploration
As construction ramps up, exploration efforts will continue to pursue regional targets with a fly camp. The
NW extension target located 10 km northwest of the Oko West deposit presents a strong soil anomaly .
Early interpretations from trenching have revealed cross -cutting mineralized structures, dominated by
extensional, NW-trending sulfide-rich quartz veins and conjugate NNE -oriented shear zones, suggesting a
complex structural regime influencing fluid flow an d mineral deposition. These structures are closely
associated with the main foliation patterns within the volcano -sedimentary sequence and are further
influenced by a broader granitoid intrusive system. A total of 6,300 m of trenching and reverse circulati on
drilling is planned, which may be followed by diamond drilling depending on success, to provide a better
understanding of this mineralized system and help refine GMIN’s interpretation (Figure 4).
Figure 4 - Oko West Regional Targets
Gurupi Project, Brazil
Since acquiring the Gurupi Project, GMIN has moved quickly to : consolidate historical datal reinitiate field
work; conduct infill soil sampling and subsequent trenching in prospective areas; engage with various
stakeholders; and restart the permitting processes. A recent court ruling annulled outdated licenses issued
to a prior operator, opening the door for a renewed exploration and development strategy.
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Gold mineralization in the Gurupi Belt is controlled by the Tentugal shear zone, a 15 –30 km wide and
~120 km long sinistral strike-slip corridor, where deformation focused in carbonaceous schists and volcanic
and volcanoclastic rocks (Figure 5). Gold in deposits along this trend is hosted in quartz–carbonate–sulfide
veins and disseminated pyrite, with alteration marked by silicification, carbonatization, and sulfidation.
Mineralization is consistent with classic orogenic gold systems.
Gurupi consists of 47 contiguous tenements covering ~1,900 km² along the Tentugal shear zone, with
current mineral resources including 1.83 Moz of indicated resources (43.5 Mt at 1.31 g/t Au) and 0.77 Moz
of inferred resources (18.5 Mt at 1.29 g/t Au), hosted in the Blanket, Contact (Cipoeiro area), Chega Tudo
and Mandiocal (Chega Tudo area) deposits. These deposits offer strong expansion potential as limited drilling
outside of the resource areas has been completed.
Infill soil sampling completed in 2025 have highlighted three main mineralized structures 2 km north of
known mineralization at Mandiocal (Chega Tudo). Follow up trenching carried out over these anomalies has
confirmed the district’s exploration upside (Figure 6, Table 2).
Expanded 2025 Exploration Program
An expanded 2025 budget of USD $6–8 million has been approved (previously USD $2-4 million – see news
release dated February 20, 2025)) , with the primary objective of testing the continuity at depth of the
surface mineralized structure highlighted by soil and trenching at Grodiocal. A total of 10,000 m of RC drilling
is currently planned, of which 7,500 m is expected to be completed by year-end. This will be complemented
by regional soil sampling and trenching aimed at generating and advancing new targets.
This RC drilling is located outside of the claims subject to the past injunction as we expect the permitting
process to be completed in Q1-2026 in these claims (Figure 7). Diamond drilling (DD) is planned with a total
of 8,500 m focused on the Cipoiero extension. This program will commence soon after the receipt of all
required permits. The long-term exploration strategy focuses on defining new deposits across this highly
prospective property to drive significant resource growth.
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Figure 5 - Gurupi Belt geological map and gold soil anomaly