First Mining Strengthens Miroir Discovery at Duparquet Gold Project with New Near-Surface Drilling Results and Expands Valentre Target Zone at Depth
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NEWS RELEASE
First Mining Strengthens Miroir Discovery at Duparquet Gold Project with New
Near-Surface Drilling Results and Expands Valentre Target Zone at Depth
• Miroir – Multiple positive gold intercepts returned near surface including:
o DUP25-052 returns 2.77 g/t Au over 11.1 m , including 4.36 g/t Au over 6.5 m, at a depth of 12.9 m
o DUP25-054 returns 1.41 g/t Au over 11.9 m, including 2.52 g/t Au over 5.25 m, at a depth of 26.7 m
• Valentre – Significant intercepts supporting target expansion at depth and along strike including:
o DUP25-054 returns 3.96 g/t Au over 9.3 m , including 5.71 g/t Au over 5.8 m
May 28, 2025 – Vancouver, Canada – First Mining Gold Corp. (“First Mining” or the “Company”) (TSX: FF)
(OTCQX: FFMGF) (FRANKFURT: FMG) is pleased to announce initial drilling results from the 202 5 drilling
program at its Duparquet Gold Project (“Duparquet Project” or the “Project”) located in the Abitibi region of
Quebec, Canada. The Company commenced its 2025 drilling program at the Duparquet Project in March ,
with one drill rig targeting the Miroir discovery and a second drill rig added in April to further support and
accelerate the program to complete an estimated 18,000 m of drilling as part of the 2025 campaign.
The newly discovered Miroir target remains an excellent expansion op portunity where the 2025 drilling
program and strategy is focused on further delineating the near surface extent of the mineralization footprint.
The initial drill holes tested a zone extending approximately 100 m along strike from the initial discovery hole
DUP24-048. Multiple significant intercepts of gold mineralization have been returned from this drilling ,
confirming and expanding the known extent of mineralization at Miroir. Highlights include near surface
mineralization intercepts from drill hole DUP25-052 that returned 2.77 g/t Au over 11.1 m, including 4.36 g/t
Au over 6.5 m, and drill hole DUP25-054 that returned 1.41 g/t Au over 11.9 m, including 2.52 g/t Au over 5.25
m, demonstrating encouraging grade and widths of gold mineralization within this shallow target that remains
open for expansion (Figure 1).
“Our exploration drilling continues to demonstrate significant resource growth potential by delineating new
discovery zones as well as demonstrating the continuity of mineralization along strike and at depth within
underexplored areas of the Duparquet Gold Project ,” stated Dan Wilton, CEO of First Mining. “ The
confirmation of the continuity of near-surface mineralization in the Valentre and Miroir areas demonstrates
that this well-established resource, already one of the largest in Quebec, can continue to grow. Duparquet is
emerging as one of the largest gold development projects in Quebec and we are continuing to advance it
through the development process.”
Further strong results also include assays from a secondary target within a dual-purpose exploration drill hole
at Miroir, where the depth extension of mineralization at the Valentre target, located 225 m south of Miroir,
has now been successfully intersected at a vertical depth of 335 m. Within the secondary target, drill hole
DUP25-054 returned 3.96 g/t Au over 9.3 m from 409.7 m to 419.0 m , including 5.71 g/t Au over 5. 8 m,
confirming a large extension and continuity of gold mineralization at the Valentre target along a key plunge.
The assay results returned from the Valentre target continues to demonstrate continuity in grade and
furthermore continues to validate the open-ended mineralization at Valentre.
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Figure 1: Plan view map, highlighting the Miroir target area and multiple significant near surface assay results .
Assay highlights from the 1, 140 metres completed across the initial six drill holes of the 2025 program are
shown in Table 1, with a full list of assays returned in Table 2 and collar details in Table 3.
Table 1: Selected Significant Drill Intercepts, 2025 Program – Miroir and Valentre Targets
Hole ID From
(m) To (m) Length (m) Grade (Au g/t) Target
DUP25-050 8.0 14.9 6.9 1.48 Miroir
DUP25-051 8.0 13.0 5.0 1.47 Miroir
DUP25-051 24.2 27.4 3.2 3.54 Miroir
DUP25-051 inc. 25.0 25.7 0.7 12.00 Miroir
DUP25-052 12.9 24.0 11.1 2.77 Miroir
DUP25-052 inc. 12.9 19.4 6.5 4.36 Miroir
DUP25-052 and inc. 12.9 13.6 0.7 13.40 Miroir
DUP25-052 34.3 36.5 2.2 2.92 Miroir
DUP25-052 103.0 104.0 1.0 5.03 Miroir
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Hole ID From
(m) To (m) Length (m) Grade (Au g/t) Target
DUP25-054 26.7 38.6 11.9 1.41 Miroir
DUP25-054 inc. 27.3 32.55 5.25 2.52 Miroir
DUP25-054 and inc. 29.4 30.5 1.1 7.27 Miroir
DUP25-054 380.35 390.1 9.75 1.14 Valentre
DUP25-054 inc. 383.2 387.9 4.7 1.65 Valentre
DUP25-054 and inc. 384.2 384.7 0.5 6.19 Valentre
DUP25-054 409.7 419.0 9.3 3.96 Valentre
DUP25-054 inc. 412.0 417.8 5.8 5.71 Valentre
DUP25-054 and inc. 415.0 417.8 2.8 7.50 Valentre
Duparquet 2025 Exploration Program Updates
Exploration activities are ongoing at the Duparquet Project with two drill rigs actively advancing at key
resource growth targets through to the fall. Regional field campaigns will be commencing at the end of May
2025 with a focus on target generation across favourable lithologies and structures. The North Zone drilling
will continue to focus on testing the syenite -mafic volcanic contact that has previously demonstrated an
ability to host higher grade gold mineralization. Drilling at the South Zone will be targeting the extension of
mineralization below the historical Donchester mine workings. Additional targets to be followed up on is the
Aiguille Target, where drilling will be following up on the two discovery holes to further drill test the target’s
open-ended potential. A plan map of the key targets for exploration drilling activities is shown in Figure 2.
Figure 2: Plan view map of Duparquet geology and mineral resource with main targets around the project core area.
Additional Details on the Miroir and Valentre Drilling
Miroir
The 2025 Miroir drilling is focused on further delineating the extent of mineralization around the 2024
discovery hole, DUP24-048, that returned 3.12 g/t Au over 19.35 m close to surface (refer to news release
dated January 20, 2025). An area of approximately 100 m along strike has thus far been drill tested with six
drill holes (Table 3) intersecting seven unique significant mineralization intervals including DUP25-052 that
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returned 2.77 g.t Au over 11.1 m, including 4.36 g/t Au over 6.5 m (Tables 1 and 2). The mineralized intercepts
confirm the open-ended nature of the Miroir target (Figure 1).
The Miroir target is situated 225 m north of the Valentre target, hosted along the northern contact between
the mafic volcanic and the syenite (Figure 3). This contact zone has traditionally demonstrated a stronger
affinity for higher-grade mineralization, a charac teristic also observed at the North Zone target area of the
project, located 1.5 km to the west.
Figure 3: Plan view of select drill holes from the 2025 drilling program at the Miroir and Valentre target areas.
Mineralization at the Miroir target is associated with silica-altered, sheared and brecciated basalt and
syenite, featuring dark smoky quartz veining and up to 5% very fine -grained disseminated pyrite
mineralization. The mineralized intercepts are spatially corre lated with D2 deformation zones and are
typically occurring at a strike of northeast to southwest and east -west along the syenite -basalt contacts,
further validating the structural and lithological controls on mineralization in this area.
Valentre
The objective of the 2025 drilling campaign at the Valentre target is to evaluate grade continuity and to refine
the understanding of higher-grade mineralized zones at depth through a targeted drilling campaign. A dual-
target hole, DUP25-054, was designed to drill test both the Miroir and the Valentre targets, as illustrated in
Figure 4. Significant results returned from DUP25-054 for the Valentre target are 3.96 g/t Au over 9.3 m ,
including 5.71 g/t Au over 5.8 m at a depth of approximately 330 m below surface.
Mineralization in hole DUP25-054 consists of brecciated silica-altered syenite and lath syenite with up to 5%
very fine-grained disseminated pyrite mineralization. Higher-grade zones are consistent along the interpreted
D2 structures, which are characterized by intense brecciation or shearing as observed in the drill core.
Follow-up drilling is planned at the Valentre target, with the objective of advancing exploration definition
through additional resolution and step-out drilling to support updated geological modelling with a potential
for incorporation into future mineral resource estimates (Figure 5).
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Figure 4: Cross section and plan view of the recently completed drilling at the Miroir and Valentre targets, highlighting sele ct
drill holes and significant intercepts downhole. The cross section is looking west.
Figure 5: Valentre Long Section (A-A’ reference on Figure 3), showing the Duparquet mineral resource outline with recently
completed drilling at the target. The long section is looking north.
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Table 2: Initial Assay Results from 2025 Drill Program
Hole ID From (m) To (m) Length (m) Grade (Au g/t) Target
DUP25-049 14.1 15.0 0.9 1.29
Miroir
DUP25-049 73.3 74.0 0.7 0.62
DUP25-049 105.6 108.6 3.0 0.42
DUP25-050 8.0 14.9 6.9 1.48
DUP25-050 33.7 34.4 0.7 0.45
DUP25-050 38.25 39.0 0.75 0.47
DUP25-050 58.3 58.9 0.6 0.46
DUP25-050 97.0 98.0 1.0 0.50
DUP25-051 8.0 13.0 5.0 1.47
DUP25-051 18.0 19.6 1.6 2.71
DUP25-051 24.2 27.4 3.2 3.54
DUP25-051 inc. 25.0 25.7 0.7 12.00
DUP25-051 41.0 42.0 1.0 0.54
DUP25-051 55.5 56.4 0.9 0.52
DUP25-051 68.0 69.0 1.0 0.42
DUP25-051 107.0 108.0 1.0 1.29
DUP25-051 132.0 136.9 4.9 0.84
DUP25-052 12.9 24.0 11.1 2.77
DUP25-052 inc. 12.9 19.4 6.5 4.36
DUP25-052 and
inc.
12.9 13.6 0.7 13.40
DUP25-052 30.0 30.85 0.85 0.89
DUP25-052 34.3 36.5 2.2 2.92
DUP25-052 101.0 102.0 1.0 0.63
DUP25-052 103.0 104.0 1.0 5.03
DUP25-053 19.0 20.5 1.5 0.72
DUP25-053 27.0 32.4 5.4 0.41
DUP25-053 90.0 90.75 0.75 0.51
DUP25-054 15.0 16.0 1.0 0.52
DUP25-054 26.7 38.6 11.9 1.41
DUP25-054 inc. 27.3 32.55 5.25 2.52
DUP25-054 and
inc.
29.4 30.5 1.1 7.27
DUP25-054 57.4 58.05 0.65 1.41
DUP25-054 127.55 128.65 1.1 1.44
Valentre DUP25-054 180.25 184.25 4.0 0.65
DUP25-054 295.8 296.75 0.95 2.20
DUP25-054 310.2 312.0 1.8 0.56
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Hole ID From (m) To (m) Length (m) Grade (Au g/t) Target
DUP25-054 337.0 338.6 1.6 0.96
DUP25-054 342.3 342.8 0.5 0.43
DUP25-054 349.0 350.25 1.25 0.60
DUP25-054 354.1 354.6 0.5 2.28
DUP25-054 357.5 362.5 5.0 0.95
DUP25-054 inc. 357.5 358.4 0.9 3.75
DUP25-054 374.9 376.0 1.1 2.27
DUP25-054 380.35 390.1 9.75 1.14
DUP25-054 inc. 383.2 387.9 4.7 1.65
DUP25-054 and
inc.
384.2 384.7 0.5 6.19
DUP25-054 397.0 398.35 1.35 0.97
DUP25-054 409.7 419.0 9.3 3.96
DUP25-054 inc. 412.0 417.8 5.8 5.71
DUP25-054 and
inc.
415.0 417.8 2.8 7.50
DUP25-054 424.15 427.25 3.1 0.67
DUP25-054 431.8 432.8 1.0 1.55
DUP25-054 439.2 439.7 0.5 0.84
*Reported intervals are drilled core lengths (true widths are estimated at 75-85% of the core length interval; assay va lue s
are uncut)
Table 3: 2025 Drill Hole Locations, Miroir and Valentre Targets
Hole ID Azimuth (°) Dip (°) Length (m) Easting Northing
DUP25-049 180 -45 111 633567 5374072
DUP25-050 180 -45 129 633591 5374067
DUP25-051 183 -45 136.9 633622 5374076
DUP25-052 179 -57 158.3 633629 5374129
DUP25-053 180 -45 114 633648 5374074
DUP25-054 180 -55 490 633596 5374094
Note: Collar coordinates in UTM NAD 83 z17
About the Duparquet Gold Project
The Duparquet Project is geologically situated in the southern part of the Abitibi Greenstone Belt and is
geographically located approximately 50 km north of the city of Rouyn-Noranda. The Project benefits from
easy access and proximity to an existing workforce and infrastructure, including road, rail and hydroelectric
grid power. The Duparquet Project currently hosts a n NI 43-101 compliant gold resource of 3.4 4 million
ounces in the Measured & Indicated category, grading 1.55 g/t Au, and an additional 2.64 million ounces in
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the Inferred category, grading 1.62 g/t Au. First Mining completed a Preliminary Economic Assessment 1
(“PEA”) on the Project in 2023.
The Duparquet Project totals approximately 5,800 hectares focused on an area of 19 km of strike length along
the prolific Destor-Porcupine Fault Zone, along with numerous mineralized splays and influential secondar y
lineaments. The Duparquet Project includes the past-producing Beattie, Donchester and Duquesne mines as
well as the Central Duparquet, Dumico and Pitt Gold deposits.
1 Further details on the Duparquet PEA can be found in the technical report entitled “NI 43 -101 Technical Report: Preliminary
Economic Assessment, Duparquet Gold Project, Quebec, Canada” dated October 20, 2023, which was prepared for First Mining by G
Mining Services Inc. in accordance with NI 43 -101 and is available under First Mining’s SEDAR + profile at www.sedarplus.ca
Analytical Laboratory and QA/QC Procedures
All sampling completed by First Mining within its exploration programs is subject to a Company standard of
internal quality control and quality assurance (QA/QC) programs which include the insertion of certified
reference materials, blank materials and a level of duplicate analysis. Core samples from the 2025 drilling
program at Duparquet were sent to AGAT Laboratories, with sample preparation in Val d’Or, Quebec and
analysis in Thunder Bay, Ontario, where they were processed for gold analysis by 50 gram fire assay with an
atomic absorption finish. Samples from selected holes were sent to AGAT Laboratories in Calgary, Alber ta,
for multi-element analysis (including silver) by inductively coupled plasma (ICP) method with a four acid
digest. AGAT Laboratories systems conform to requirements of ISO/IEC Standard 17025 guidelines and
meets assay requirements outlined for NI 43-101.
Qualified Person
James Maxwell, P.Geo., VP, Exploration and Project Operations for First Mining, is a “Qualified Person” for
the purposes of NI 43-101 Standards of Disclosure for Mineral Projects and has reviewed and approved the
scientific and technical disclosure contained in this news release.
About First Mining Gold Corp.
First Mining is a gold developer advancing two of the largest gold projects in Canada, the Springpole Gold
Project in northwestern Ontario, where we have commenced a Feasibility Study and permitting activities ar e
on-going with a final Environmental Impact Statement / Environmental Assessment for the project submitted
in November 2024, and the Duparquet Gold Project in Quebec, a PEA-stage development project located on
the Destor-Porcupine Fault Zone in the prolific Abitibi region. First Mining also owns the Cameron Gold Project
in Ontario and a portfolio of gold project interests including the Pickle Crow Gold Project (being advanced in
partnership with Firefly Metals Ltd.) and the Hope Brook Gold Project (being advanced in partnership with Big
Ridge Gold Corp.).
First Mining was established in 2015 by Mr. Keith Neumeyer, founding President and CEO of First Majestic
Silver Corp.
ON BEHALF OF FIRST MINING GOLD CORP.
Daniel W. Wilton
Chief Executive Officer and Director