Mr. Daniel Wilton reports

FIRST MINING ANNOUNCES FINAL 2023 EXPLORATION DRILLING RESULTS AND COMMENCEMENT OF 2024 DRILL PROGRAM AT THE DUPARQUET GOLD PROJECT

First Mining Gold Corp. has released continued positive results from the 2023 diamond drilling program at its Duparquet gold project, located in Quebec, Canada. In addition, the Company has commenced mobilization activities in support of its 2024 drilling campaigns.

First Mining's 2023 exploration strategy and maiden drill program on the Project was focused on derisking, validating and testing exploration targets that could unlock meaningful expansion opportunities along strike and down plunge of existing deposits. The Company completed 17 exploration drill holes totalling 6,966 m in its 2023 exploration drilling campaign and all assay results have now been received.

Results from the 2023 exploration campaign have defined several significant discovery and follow-up targets, including a new zone immediately to the south of the current mineral resource area (Buzz Zone: 6.52 g/t Au over 4.6 m), confirmation of mineralization and a higher grade trend in the area of Central Duparquet (CDHG Zone: 2.73 g/t Au over 6.15 m), extension and connectivity of the mineralization between Central Duparquet and the Dumico deposit (Valentre Zone: 1.71 g/t Au over 8.9 m) and most recently, advancing the easterly and down-dip extension of the Donchester South Shear Zone (DCD Zone: 1.83 g/t Au over 7.0 m).

"With our initial drill programs, First Mining has demonstrated an ability to define new gold zones in addition to significantly extend the known limits of the mineralized structures of the Duparquet gold project," stated Dan Wilton, CEO of First Mining. "We are excited to continue advancing the Duparquet gold project with additional expansion drilling, while also drill testing other significant exploration targets that exist on this large land package. With a positive PEA released last year, the success in our drilling program will continue to enhance and unlock the potential of this district-scale project located in the heart of the prolific Abitibi gold belt."

Highlights of the remaining holes from the 2023 drill program are presented in Table 1, with results for the entire 2023 drill program listed in Table 2. Drill hole locations from the 2023 program are included in Table 3.

2024 Duparquet Exploration Program Outlook

The aim of the 2024 program at the Duparquet project is to build on the successes and learnings of the 2023 campaigns, with a continued focus on growth opportunities within the current mineral resource, as well as targeting additional Abitibi mineralization styles that carry a potential for higher-grade settings and favour regional processing synergies.

Drilling is commencing in February 2024 where the objective is to complete the Phase 2 winter drilling component of the program. A six-hole, 2,500 m drill program is planned, targeting the North Zone as well as a regional brownfields opportunity from the 2023 field campaign that remains underexplored.

For the second quarter of 2024, the Company is aiming to commence a Phase 3 drilling campaign alongside regional airborne geophysics and LiDAR survey programs that will further uplift exploration target development and vectoring ahead of the summer field campaigns.

Discussion of Latest Results

Hole DUP23-010 was drilled along the mineralized shear zone at the southern contact of the Beattie Syenite body and approximately 200 m to the east of the current resource wireframe and outside of the PEA pit shell (Figure 1). The hole intersected 1.83 g/t Au over 7.0 m from 91.0 m to 98.0 m, including 2.19 g/t Au over 1.2 m and 2.99 g/t Au over 3.0 m (Table 1). The mineralization intersected is shallow in nature, at a depth of 80 m below surface, and is associated with intermixed syenite and basalts. Historical drilling in the area supports the extension of the mineralization 250 m below DUP23-010 (Figure 2). This mineralized intercept is from the most easterly hole along the historically mined Donchester South Zone, and this mineralized structure and zone remains open to the east and at depth and defines a zone for further characterization and targeting as it has the potential to add meaningful ounces to the known mineral resource.

Other significant intersections from the latest drilling include 2.7 g/t Au over 3.4 m and 2.46 g/t Au over 4.8 m, including 5.16 g/t Au over 1.6 m in drill hole DUP23-011, as well as 0.96 g/t Au over 10.0 m and 1.1 g/t Au over 6.0 m in drill hole DUP23-012 (Table 2 and Figure 3). The near-surface results from DUP23-011 confirm the up-dip extension of the historically mined Donchester South Zone. The assays returned support further investigation of opportunities to add additional ounces (defining new wireframes) as the intercepts are beyond the limits of the current PEA pit shell. Drill hole DUP23-012 confirms the continuity at depth of the Zone 3 wireframe.

Drill hole DUP23-013 targeted a large, untested area associated with Zone 3 near the junction of the previous Beattie and Donchester claim blocks. Multiple mineralized intervals were intersected, including 8.82 g/t Au over 1.0 m, 1.21 g/t Au over 6.0 m, 0.53 g/t Au over 16.0 m and 1.52 g/t Au over 6.0 m (Table 2), with the majority of these intersections located below the interpreted PEA pit shell limits (Figure 4). The mineralization in some areas spans widths thicker than previously projected and overall the mineralization remains open at depth and to the east for several hundred metres.

A new brownfields exploration target, SID, located to the north of Dumico on the boundary of the Porcupine East property, was drill tested in 2023. The SID target is located in a lithological setting outside of the traditional Beattie syenite host and is defined by a combination of historical grab samples and a drilling trend proximal to historical property boundaries. A sheared, iron carbonate mafic volcanic historical surface grab sample returned 3.3 g/t Au and was validated in First Mining's 2023 field campaign, with assays from grab samples ranging from 0.26 to 1.78g/t Au within sheared ankerite altered basalt. Historical drill hole G-83-2 was also completed in this target area and returned 2.33 g/t Au over 11. 8 m at a downhole depth of 22.7 m. First Mining drilled two exploration holes in 2023 (DUP23-014 and DUP23-015), targeting an opportunity to intersect the historical interval at a further depth than previously tested (Figure 5). Both drill holes intersected sulphide mineralization and a significant amount of quartz veining (spanning over 4.5 metres) associated with felsic tuffs and basalts interbedded with local graphitic argillites. Drill hole DUP23-014 returned 1.0 g/t Au over 1.0 m and drill hole DUP23-015 returned 1.41 g/t Au over 2.0 m (Table 2). Follow-up field work and modelling of the drill results will be a focus of this area in 2024 to better define this brownfields target.

"The ability to demonstrate additional mineralization host settings and styles is an important factor for our exploration team seeking to make new discoveries," stated James Maxwell, VP Exploration and Project Operations. "As our programs work to open up the exploration space surrounding Duparquet, we are continually met with positive validation for our efforts and encounter new opportunities supporting and growing the regional gold endowment."

Drill holes DUP23-016 and DUP23-017 were drilled to test the western extension of the historically mined West Zone on the Beattie property. Hole DUP23-016 was abandoned due to thicker than expected overburden, while DUP23-017 successfully cased through the overburden before collaring into the favourable sheared basalt and syenite porphyries. Significant gold mineralization was not returned in assay, however drilling of the hole was instrumental in identifying the target shear zone providing an open vector for exploration to the west.

2023 Duparquet Drilling Program Overview

First Mining commenced an exploration campaign in 2023 that drill tested an array of targets across the main Project area (Figure 6). The campaign focused on two main strategies; firstly, derisking the resource through validation whilst expanding on resource growth and optimization opportunities, and secondly, unlocking the geoscientific understanding of the Project to define opportunities outside of the known resource areas.

Results from the 2023 campaign support the growth potential of the Duparquet project and the confirmation of new zones and targets, near the resource as well as more regional brownfields opportunities, demonstrating a strategy that has potential to deliver further success to First Mining.

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 totals approximately 5,800 hectares focused along an area of 19 kilometres of strike length along the prolific Destor-Porcupine Fault Zone, along with numerous mineralized splays and influential secondary lineaments. The Duparquet project includes the past-producing Beattie, Donchester and Duquesne mines as well as the Central Duparquet, Dumico and Pitt Gold deposits. In 2023, First Mining completed a positive Preliminary Economic Assessment ("PEA") for the Project that will guide phased optimization and advancement moving forward.

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 2023 drilling program at Duparquet were sent to AGAT Laboratories, with sample preparation in Val d'Or and analysis in Thunder Bay, 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, Alberta, 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

Louis Martin, P.Geo., Senior Geologic Consultant of 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 are on-going with a draft Environmental Impact Statement ("EIS") for the project published in June 2022, and the Duparquet 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.), the Hope Brook Gold Project (being advanced in partnership with Big Ridge Gold Corp.), and a large equity interest in Treasury Metals Inc.

First Mining was established in 2015 by Mr. Keith Neumeyer, founding President and CEO of First Majestic Silver Corp.

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