First Mining Intersects 7.18 g/t Au over 8 m at the Miroir Target and Provides Duparquet Project Update
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NEWS RELEASE
First Mining Intersects 7.18 g/t Au over 8 m at the Miroir Target and
Provides Duparquet Project Update
• DUP25-085 returns 3.74 g/t Au over 15.5 m and 7.18 g/t over 8.0 m, including 30.58 g/t over 1.65 m
• DUP25-081 returns 1.56 g/t Au over 33.15 m, including 3.18 g/t Au over 7.6 m
• DUP25-090 returns 4.08 g/t Au over 12.0 m, including 11.20 g/t Au over 1.0 m, extending
mineralization to vertical depth of 250 m
March 9, 2026 – Vancouver, Canada – First Mining Gold Corp. (“First Mining” or the “Company”) (TSX: FF)
(OTCQX: FFMGF) (FRANKFURT: FMG) is pleased to announce additional results from the 2025 exploration
drilling program at its Duparquet Gold Project (“Duparquet Project ” or the “Project ”) located in the Abitibi
region of Quebec, Canada . The Company completed its 2025 drilling program at the Project in October,
totaling 16,577 m of drilling. The results reported here are mainly from the Miroir target, a high -priority
discovery zone first intersected in the 2024 drill program and subsequently advanced through follow -up
drilling in 2025. The latest results extend Miroir mineralization to a vertical depth of 250 m, representing an
additional 150 m of down -dip expansion beyond previous drilling. The target currently spans approximately
150 m of strike length and 250 m in depth and remains open at depth and along strike to the east (Figures 1 &
2).
Assay results from drill hole DUP25 -081 have returned 1.56 g/t Au over 33.15 m, including 3.18 g/t Au over
7.60 m. Drill hole DUP25-085 returned 3.74 g/t Au over 15.5 m and 7.18 g/t over 8.0 m, including 30.58 g/t
over 1.65 m. DUP25-090 returned 4.08 g/t Au over 12.0 m, including 11.20 g/t Au over 1.0 m . Drilling at the
Miroir target has continuously been building potential for a strong resource growth zone returning multiple
robust gold intercepts, and it will be a key target to advance in the 2026 drilling campaign.
“The results from our 2025 drilling program at Duparquet and around the Miroir target continue to
demonstrate potential for the Project ,” stated Dan Wilton, CEO of First Mining. “ The Project’s near -surface
mineralization footprint continues to be strengthened with our ongoing drilling success while further
extending the target at depth , demonstrating Miroir’s potential as a resource-growth area at the Duparquet
Project. In addition to our exploration program, we are excited to embark on our environmental baseline
program to continue advancing the Project . The development and reclamation of this Project site represent
a tremendous opportunity not only for First Mining, but for the provincial government, City of Duparquet,
neighbouring communities and First Nation members.”
Duparquet Project Update
First Min ing is please d announce that it has commenced a comprehensive environmental baseline data
collection program at the Duparquet Project to support the information requirements to complete the
regulatory approvals process for the Project. The program is led by First Mining’s in-house Sustainability team
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and supported by Stantec, who both have significant related experience from the successful development of
the Greenstone Gold Mine, which recently commenced production in Ontario.
The baseline programs cover all areas of the environment starting with geochemistry and water quality,
through to aquatic studies and other biophysical aspects required to advance Project planning. First Mining
continues its engagement and collaboration wi th the C ity of Duparquet and its residents through the
implementation of the Memorandum of Understanding signed in September 2025. Project engineering
studies and consultation are planned to advance in 2026 towards optimizing the site plan and the potentia l
publication of a feasibility study building on the success of the 2023 Preliminary Economic Assessment.
Exploration Program Update and Outlook
Drilling activities at the Duparquet Project concluded in October 2025, with a total of 16,577 m completed
during the year. While all assays from the 2025 drilling program have been received, outstanding results and
interpretations will be disclosed in a future update as ongoing integration and modelling work continues.
The Company is currently reviewing and incorporating the 2025 data into updated geological and exploration
target models. In parallel, the 2026 exploration program is being finalized, with a targeted commencement in
Q2 2026. Planned drilling will focus on high-priority targets, including Miroir, to further advance its potential
as a key resource expansion opportunity.
Additional Drilling Details
Further highlights from the latest drilling results disclosed herein are from the Valentre target area (Figure 2).
Drill hole DUP25-074 returned 1.92 g/t Au over 9.3 m, including 2.80 g/t Au over 4.8 m , and DUP25-083
returned 4.26 g/t Au over 3.5 m and 2.41 g/t Au over 10.95 m. The latest results continue to demonstrate the
continuity of the CVD target area, with the target currently extending to 480 m below surface and remain ing
open at depth.
Two additional greenfields exploration targets, Normandie and Lumière , were drill tested in 2025 with a
program (Figure 2) targeting geophysical anomalies hosted along favo urable lithological contacts.
Normandie, a geophysical ly interpreted structure located 150 m towards the northeast along strike from
Miroir, returned 1.39 g/t Au over 4.0 m and 5.22 g/t Au over 1.0 m in DUP25-068, highlighting a favourable area
for gold mineralization and further geological modelling and drill testing. Drilling at the Lumière target,
located ~300 m northwest of Miroir, returned 7.74 g/t Au over 1.40 m as well as 2.23 g/t Au over 1.50 m near
surface in drill hole DUP25-086, successfully demonstrating the presence of favo urable mineralization and
once further modelled, a favourable target for follow up drilling.
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Figure 1: Miroir Long Section, highlighting recent drilling as well as the open-ended potential of the Miroir interpreted
structure
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Figure 2: Plan view map, highlighting the Miroir, Valentre and other significant targets in the Central Duparquet-Dumico
area
The latest reported assays represent approximately 2,550 m of drilling from a total of ~5,000 m across 22 drill
holes drilled to date at the Miroir target. These holes were focused on advancing the understanding of
mineralization controls at Miroir and extending the target depth whi le testing the down -dip potential. Assay
highlights are provided in Table 1, with the full list of assay results presented in Table 3 and drill collar details
in Table 4. All assay results from this target’s drilling have now been disclosed.
Table 1: Latest Significant 2025 Drill Intercepts
Hole ID From (m) To (m) Length (m) Grade (Au g/t) Target
DUP25-066 191.2 193.0 1.8 6.08 Miroir
DUP25-066 including 192.0 193.0 1.0 8.53 Miroir
DUP25-066 197.5 202.0 4.5 1.23 Miroir
DUP25-068 19.0 23.0 4.0 1.39 Normandie
DUP25-068 77.4 78.4 1.0 5.22 Normandie
DUP25-074 214.4 223.7 9.3 1.92 Valentre
DUP25-074 including 218.9 223.7 4.8 2.80 Valentre
DUP25-081 12.1 14.15 2.05 2.57 Miroir
DUP25-081 19.0 28.8 9.8 1.13 Miroir
DUP25-081 128.4 148.7 20.30 0.61 Miroir
DUP25-081 154.7 156.35 1.65 3.17 Miroir
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Hole ID From (m) To (m) Length (m) Grade (Au g/t) Target
DUP25-081 196.9 206.5 9.6 1.53 Miroir
DUP25-081 223.7 256.85 33.15 1.56 Miroir
DUP25-081 including 243.7 251.3 7.6 3.18 Miroir
DUP25-081 276.6 277.5 0.9 7.54 Miroir
DUP25-083 509.0 512.5 3.5 4.26 Valentre
DUP25-083 523.65 534.6 10.95 2.41 Valentre
DUP25-084 86.7 89.0 2.3 2.39 Miroir
DUP25-084 184.0 213.0 29.0 1.47 Miroir
DUP25-084 229.0 237.0 8.0 3.28 Miroir
DUP25-084 including 235.0 236.0 1.0 18.20 Miroir
DUP25-084 245.0 255.0 10.0 1.83 Miroir
DUP25-084 including 245.0 246.0 1.0 9.58 Miroir
DUP25-085 53.0 68.5 15.5 3.74 Miroir
DUP25-085 148.0 156.0 8.0 7.18 Miroir
DUP25-085 including 153.35 155.0 1.65 30.58 Miroir
DUP25-086 9.5 10.9 1.4 7.74 Lumière
DUP25-087 41.0 46.25 5.25 3.35 Miroir
DUP25-087 including 43.0 43.55 0.55 20.50 Miroir
DUP25-087 79.25 86.4 7.15 0.85 Miroir
Additional Details on Miroir, CVD, Aiguille, Lumière, and Normandie Drilling
Miroir
The 2025 drilling at the Miroir target focused on further delineating the extent of near -surface mineralization
discovered in 2024. A series of significant inte rcepts have been returned at Miroir to date (Table 2), with the
most recent drilling continu ing to confirm and expand the target area, extending mineralization to a vertical
depth of 250 m below surface and highlighting multiple near-surface gold zones.
Notable results from the most recent drilling include drill hole DUP25-081 returning 1.56 g/t Au over 33.15 m,
including 3.18 g/t Au over 7.60 m. Drillhole DUP25-085 returned 3.74 g/t Au over 15.5 m and 7.18 g/t over 8.0
m, including 30.58 g/t over 1.65 m, and DUP25-090 returned 4.08 g/t Au over 12.0 m, including 11.20 g/t Au
over 1.0 m. These results continue to demonstrate the potential for multiple, high-quality gold zones within
the Miroir target and reinforce its potential for further growth.
Table 2: Previous Disclosure Highlights, Miroir target
Drill Hole Highlight Interval Disclosure Date
DUP24-048 3.12 g/t Au over 19.35 m January 20, 2025
DUP25-052 2.77 g/t Au over 11.1 m, including 4.36 g/t Au over 6.5 m May 28, 2025
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DUP25-064 3.23 g/t Au over 25.9 m, including 11.20 g/t Au over 2.0 m,
and including 10.16 g/t Au over 1.4 m September 24, 2025
DUP25-078 2.01 g/t Au over 29.8 m, including 15.70 g/t Au over 0.75 m
and 18.20 g/t Au over 1.0 m November 10, 2025
High-grade mineralization at the Miroir target is associated with coincident brittle and ductile deformation
within a volcanic package proximal to syenite contacts. Mineralized intercepts are spatially correlated with
northeast–southwest–striking D2 deformation zones, coincident with a geophysically inferred basalt–syenite
contact that plunges to the east.
In the most recent drill holes, mineralization is hosted within brecciated, silica -altered basalt and syenite,
with 2–5% very fine-grained disseminated to fracture -controlled bronze pyrite associated with thin smoky
quartz veinlets.
Valentre
The 2025 drilling program further confirmed the continuity of the mineralization at the Valentre target and the
latest notable results from the most recent drilling include drill hole DUP25-074 returning 1.92 g/t Au over 9.3
m, including 2.80 g/t Au over 4.8 m , and DUP25-083 returning 4.26 g/t Au over 3.5 m and 2.41 g/t Au over
10.95 m. The results continue to demonstrate the continuity of the Valentre target which currently extends to
480 m below surface and remains open at depth.
Gold mineralization at the Central Duparquet -Valentre-Dumico (“CVD”) area is hosted within mineralized
silica- and sericite-altered syenite units with very fine-grained disseminated pyrite ranging from 0.5- 3%. Gold
mineralization is also coincident with dark smoky quartz veins and veinlets, with up to 3% fine -grained
disseminated pyrite mineralization. The gold-mineralized quartz veins are hosted within syenite units and
intervals of alternating syenite and mafic and ultramafic volcanic units.
Aiguille
In the 2025 drilling campaign, the up -dip and along -strike opportunities at the Aiguille target were
investigated with a sequence of shallow drill holes, targeting a key geological contact to further enhance the
resolution for modelling the extent of mineralization . Drill hole DUP25-071 returned 0.62 g/t Au over 1.0 m
and DUP25-074 returned 0.48 g/t A u over 1.0 m. These holes successfully demonstrated anomalous gold
values in key structures. The down-dip potential of the target continues to remain open at depth and will be
validated with further drilling.
Normandie
The Normandie target, located 150 m northeast of Miroir, is a geophysical anomaly interpreted as a structural
corridor linking the Miroir target with the greenfield Sid target (see press release dated February 22, 2024).
Drilling in 2025 successfully intersected high-grade brecciated and shear -style veining along the syenite–
volcanic contact, with hole DUP25-068 returning 1.39 g/t Au over 4.0 m and 5.22 g/t Au over 1.0 m. This
maiden drill hole at Normandie validated the geological interpretation, demonstrating geological continuity
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and a favourable mineralization setting between the Miroir and Sid targets. Follow -up drilling will focus on
testing the mineralization footprint along strike and down-dip.
Figure 3 : Plan view map highlighting the Normandie target area and showing the 2 nd vertical derivative magnetics
geophysical product
Lumière
The Lumière target, located approximately 300 m northwest of Miroir (Figure 2), was drill tested in 2025, with
hole DUP25-086 returning 7.74 g/t Au over 1.4 m and 2.23 g/t Au over 1.5 m near surface. Drilling targeted a
geophysical anomaly and syenite–volcanic contacts along the northern margin of the syenite body.
High-grade gold values are associated with brecciated and sheared volcanic units with fracture -controlled
silica alteration. Structural and geochemical interpretations will be integrated to update the 3D geological
model along the contact and identify priority areas for follow-up drilling.
Table 3: Latest Assay Results from 2025 Drill Program
Drill Hole From (m) To (m) Length (m) Grade (Au g/t) Target
DUP25-066 191.2 193.0 1.8 6.08 Miroir
DUP25-066 including 192.0 193.0 1.0 8.53 Miroir
DUP25-066 197.5 202.0 4.5 1.23 Miroir
DUP25-066 213.0 219.5 6.5 0.62 Miroir
DUP25-066 228.7 229.7 1.0 0.73 Miroir
DUP25-066 274.5 275.0 0.5 5.12 Miroir
DUP25-068 19.0 23.0 4.0 1.39 Normandie
DUP25-068 77.4 78.4 1.0 5.22 Normandie
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Drill Hole From (m) To (m) Length (m) Grade (Au g/t) Target
DUP25-071 147.0 148.0 1.0 0.62 Aiguille
DUP25-072 no significant mineralization
DUP25-073 56.0 57.0 1.0 0.46 Aiguille
DUP25-073 121.0 122.0 1.0 0.47 Aiguille
DUP25-074 46.0 47.0 1.0 0.46 Valentre
DUP25-074 60.0 61.0 1.0 0.66 Valentre
DUP25-074 106.3 106.95 0.65 0.52 Valentre
DUP25-074 111.05 111.95 0.9 4.99 Valentre
DUP25-074 155.0 156.0 1.0 0.42 Valentre
DUP25-074 159.25 160.0 0.75 0.69 Valentre
DUP25-074 163.0 165.0 2.0 0.58 Valentre
DUP25-074 168.6 169.3 0.7 0.40 Valentre
DUP25-074 214.4 223.7 9.3 1.92 Valentre
DUP25-074 including 218.9 223.7 4.8 2.80 Valentre
DUP25-074 405.3 406.25 0.95 0.46 Aiguille
DUP25-074 411.0 412.0 1.0 0.48 Aiguille
DUP25-081 7.0 8.0 1.0 0.71 Miroir
DUP25-081 12.1 14.15 2.05 2.57 Miroir
DUP25-081 including 12.1 12.65 0.55 7.77 Miroir
DUP25-081 19.0 28.8 9.8 1.13 Miroir
DUP25-081 83.0 83.85 0.85 0.49 Miroir
DUP25-081 103.2 107.0 3.8 0.46 Miroir
DUP25-081 128.4 148.7 20.3 0.61 Miroir
DUP25-081 144.0 146.9 2.9 0.45 Miroir
DUP25-081 147.85 148.7 0.85 1.08 Miroir
DUP25-081 154.7 156.35 1.65 3.17 Miroir
DUP25-081 168.35 169.2 0.85 2.30 Miroir
DUP25-081 192.0 193.0 1.0 0.56 Miroir
DUP25-081 196.9 206.5 9.6 1.53 Miroir
DUP25-081 223.7 256.85 33.15 1.6 Miroir
DUP25-081 including 243.7 251.3 7.6 3.18 Miroir
DUP25-081 276.6 277.5 0.9 7.54 Miroir
DUP25-081 281.25 281.75 0.5 1.33 Miroir
DUP25-081 296.0 297.0 1.0 0.72 Miroir
DUP25-081 307.2 308.0 0.8 0.46 Miroir
DUP25-082 70.55 72.0 1.45 0.72 Miroir
DUP25-082 110.75 111.35 0.6 0.78 Miroir
DUP25-082 214.9 215.4 0.5 0.56 Miroir
DUP25-083 123.0 124.0 1.0 1.37 Miroir
DUP25-083 287.0 288.0 1.0 0.42 Valentre