Mr. Daniel Wilton reports

FIRST MINING GOLD INTERSECTS 0.92 G/T AU OVER 114 METRES AND 0.75 G/T AU OVER 58 METRES AT ITS SADDLE TARGET IN THE BIRCH-UCHI GREENSTONE BELT PROJECT

First Mining Gold Corp. has released results from the 2023 drilling program focused on the advancement of its Saddle drilling target in the Birch-Uchi greenstone belt project (BUGB project) located in Northwestern Ontario, Canada. The Saddle target occurs approximately 12 kilometres southwest of the company's Springpole gold project. Winter drilling at the Birch-Uchi project comprised a total of 11 drill holes for 2,760 metres focused on three target areas, including Saddle, Horseshoe and Atlantis. First drilling by the company at the Saddle target included five drill holes totalling 842 metres which identified a significant gold mineralization system, returning grades of 0.92 gram per tonne Au over 114 metres in hole SAT23-001, and 0.75 g/t Au over 57.7 metres in drill hole SAT23-002.

Saddle target highlights:

• Initial drilling campaign on the Saddle target since property acquisition returned consistent gold mineralization over meaningful widths that remains open for expansion.
• Historical grab rock samples validated by field program follow-up.
• Employed geoscience systems approach to characterize the target geology, supporting additional exploration opportunities in close proximity to the immediate drill area.
• The BUGB project is proving to be prospective with a second drilled target delivering meaningful opportunity.

"Our regional exploration efforts are demonstrating the ability to identify mineralization settings that support new discoveries and potential satellite opportunities in this emerging gold district," stated Dan Wilton, chief executive officer of First Mining Gold. "In only our second drill target tested, we are seeing the strength of gold endowment hosted in the Birch-Uchi greenstone belt where First Mining has focused exploration surrounding its flagship Springpole gold project."

Saddle target

The Saddle target is located approximately 12 kilometres southwest of First Mining Gold's Springpole deposit, which hosts a National Instrument 43-101 mineral resource totalling 4.6 million ounces of gold in the indicated category and 300,000 ounces of gold in the inferred category.* The Saddle target is hosted within the Birch-Uchi greenstone belt (BUGB), where locally a significantly deformed and mineralized granodiorite intrusive occurs in contact with sedimentary lithologies. Mineralization is associated with increased silica and carbonate alteration and high concentrations of multiphase quartz veining and sulphides. The dominant sulphide mineralization is composed of pyrite and occurs as fine- to coarse-grained disseminations averaging an abundance of 1 to 7 per cent, with localized abundances up to 15 to 20 per cent. Veining is typically one centimetre to five cm in scale, with higher vein densities surrounding areas of increased silica and carbonate alteration. Mineralization appears to occur along potential crosscutting shear structures which have been interpreted to be coincident with geophysical resistivity-low signatures. The 2023 drilling results are indicative of a mineralization envelope that is continuous on both sides of the shear zone and will form an important focus of additional follow-up exploration.

*Details of the Springpole gold project mineral resource can be found in the technical report entitled "NI 43-101 Technical Report and Pre-Feasibility Study on the Springpole Gold Project, Ontario, Canada" which was prepared by AGP Mining Consultants Inc. in accordance with National Instrument 43-101 Standards of Disclosure for Mineral Projects and has an effective date of Jan. 20, 2021.

The Saddle target is an underexplored opportunity that has been subject to historical prospecting and geoscience programs of induced polarization and airborne magnetic geophysics, as well as diamond drilling completed in the 1980s. Since that time, further field-based exploration activities at the prospective area have been limited.

In 2021, First Mining completed a focused field campaign that followed up on the Rice Lake (7.54 g/t and 2.67 g/t), Green Camp (1.79 g/t), Exit Bay and Trench Grid (4.8 g/t) grab sample gold occurrences that form a notable trend with the Saddle target over a projected one km strike length. Opportunities for expanding the mineralization system and the potential for exploring within a related structural setting have elevated the regional prospectivity in advancing the area.

Exploration completed in First Mining's 2022 field campaigns further advanced geologic understanding of the Green Camp zone and the Rice Lake North and Exit Bay targets, with data collection supporting an integrated 3-D exploration model. The Saddle target's surface grab sample results from the 2022 campaign returned assay results which vector toward a mineralization halo around the intrusion, with higher-grade grab samples found proximal to the contact of the sedimentary host rock and the felsic intrusive unit.

In 2022, the company conducted additional airborne geophysics surveys that supported improved targeting resolution for exploration drilling. Through processing and interpretation, a modelled shear zone coincident with mineralization has been interpreted which has proved to be valuable in stepout exploration planning for the Saddle target.

2023 winter drilling campaign

During the 2023 winter program, First Mining successfully completed 842 metres of drilling in five exploration drill holes focused on the Saddle target. Drilling was aimed at validating the newly developed 3-D exploration model, underpinned by historical drilling and field-based data collection, as well as testing extensions along strike, at depth and across an interpreted fault offset.

The results from the 2023 winter drilling highlight robust intervals of consistent gold mineralization over significant widths, and have identified key pathfinder elements in association with the gold mineralization. The program has been successful in confirming the continuation of the mineralization envelope along the shear structure, opening up the exploration growth potential around the Saddle target.

The 2023 summer field programs will further advance geological mapping and data collection around the Saddle target, with a specific focus on the quartz stockwork and chlorite alteration on surface within areas of anomalous geophysical signatures. Fieldwork results will then be integrated and reviewed in a path to support follow-up targeting.

Additional winter season drill results from an additional six holes totalling 1,938 metres completed at the Horseshoe and Atlantis targets are expected to be released once assay reviews are finalized by the company.

About the Birch-Uchi greenstone belt

First Mining's BUGB project hosts significant district-scale exploration leverage in forming part of a consolidated greater-than-70,000-hectare mineral tenure. The property and broader greenstone belt host historic production centres that are demonstrative of the strong gold endowment and an affinity for potential new discovery. First Mining's extensive BUGB property position is located within the Red Lake mining district and is situated approximately 80 km east of the Red Lake mines complex of Evolution Mining, and 75 km northeast of Kinross Gold's Dixie project (formerly owned by Great Bear Resources Ltd). Geology of the region comprises Archean greenstone terranes that are endowed by significant gold mineralization inclusive of orogenic and alkaline intrusion-related deposit styles. Initial data compilation and validation to date have indicated that the region demonstrates an underexplored and previously fragmented exploration immaturity that is well levered to the company's strategy of consolidation and district screening.

The BUGB hosts multiple gold mineralization styles throughout, which supports having a strong multidiscipline geoscience foundation that can be applied in an integrated and iterative targeting approach. Early targeting and vectoring elements highlight consolidated target opportunities surrounding the Springpole project.

Analytical laboratory and quality assurance/quality control procedures

All sampling completed by First Mining within its exploration programs is subject to a company standard of internal quality assurance and quality contorl (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 were sent to Agat Laboratories in Thunder Bay and Mississauga, Ont., where they were processed for gold analysis by 50-gram fire assay with an atomic absorption finish, and multielement 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

Hazel Mullin, PGeo, director, data management and technical services, of First Mining, is a qualified person for the purposes of NI 43-101 Standards of Disclosure for Mineral Projects, and she 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 it has commenced a feasibility study and permitting activities are continuing with a draft environmental impact statement (EIS) for the project published in June, 2022, and the Duparquet, Pitt Gold, Duquesne and Porcupine East gold project in Quebec, a collection of advanced-stage development assets 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 Auteco Minerals 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 Keith Neumeyer, founding president and CEO of First Majestic Silver Corp.

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