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First Mining Announces Positive Initial Review by Best Practice Independent Geotechnical and Tailings Review Board for the Springpole Gold Project

Corporate Updates

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OTCQX: FFMGF

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NEWS RELEASE

First Mining Announces Positive Initial Review by Best Practice Independent

Geotechnical and Tailings Review Board for the Springpole Gold Project

November 13, 2024 – Vancouver, BC, Canada – First Mining Gold Corp. (“First Mining” or the

“Company”) (TSX: FF) (OTCQX: FFMGF) (FRANKFURT: FMG) is pleased to announce that an Independent

Geotechnical and Tailings Review Board (“IGTRB”) has been formally established for the Springpole Gold

Project (the “ Project”). First Mining’s initiative in establishing the IGTRB follows its commitment to

sustainability and represents best practice in Canada and internationally with the objective of providing

independent expert advice on key engineering components including the Project’s Co -Disposal Facility

(“CDF”) for tailings and mine rock management.

The IGTRB development process was initiated in 2023 and formalized in 2024 with the IGTRB meeting to

review the updated Pre-Feasibility Study design for the CDF. The IGTRB is composed of three independent

and recognized world-class experts, each with over 40 years of experience including:

• Peter Lighthall, P.Eng.

• Ward Wilson, Ph.D, P.Eng.

• John Lupo, Ph.D, P.E.

“First Mining is appreciative of having such a leading group of experts providing objective external reviews

and important recommendations on the advancement of the Project’s key infrastructure,” stated Dan

Wilton, CEO of First Mining. “Our goal was to es tablish the IGTRB early, prior to construction, to obtain

valuable feedback on the work completed to date and next steps planned. Their work has already helped

inform optimizations to the CDF design improving operational and environmental performance and t o

inform the supplemental studies planned for detailed engineering.”

The IGTRB has reviewed all design materials produced to date by the engineering team and the responses

addressing their review questions and comments. The IGTRB has noted their support for the design

advancements made since the Pre -Feasibility Study, that the work completed to date meets their

expectations, and further highlighting the favourable geotechnical foundation conditions at the CDF

location. The IGTRB reviews and feedback builds confidence in the work undertaken to date and the path

forward presented. The IGTRB will remain an important component of the Project during the life of mine

informing all aspects of the CDF from detailed engineering, construction, operations, and closure.

The IGTRB reports along with the responses addressing their questions and comments can be found in

Appendix V Designs in the Final Environmental Impact Statement / Environmental Assessment which is

publicly accessible at: https://www.firstmininggold.com/springpole-ea.

Peter Lighthall, P.Eng.

Peter Lighthall is an independent geotechnical consultant with over 50 years of experience, specializing in

tailings dams and tailings impoundments, mine rock storage, and mine water management. He has a

broad understanding of geotechnical aspects of mining projects, having participated in scoping studies,

due diligence assessments, pre- feasibility and feasibility studies, detailed engineering, project

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development, operation and closure planning. Mr. Lighthall has worked in 35 countries throughout the

world. He has worked on development and implementation of leading-edge technologies for tailings

management, including thickened and paste tailings and filtered dry stack tailings. He is well experienced

in tailings dam design and ha s been active in recent years on review and/or technical advisory roles on

numerous major mine developments.

Mr. Lighthall obtained his M.Sc., Civil Engineering at the University of London in the U.K. and has a B.A.Sc.,

Civil Engineering from the University of British Columbia. He is a Registered Professional Engineer in

British Columbia.

Ward Wilson, Ph.D, P.Eng.

Dr. Ward Wilson, Professor of Geotechnical and GeoEnvironmental Engineering at the University of

Alberta, brings more than 40 years of industrial experience to his practice in advanced mine rock and

tailings management. Having extensive work experience as a consulting engineer, he has maintained an

exceptionally strong industrial focus through his research programs both at the University of Alberta and

the University of British Columbia. Dr. Wilson is involved in tailings management systems at numerous

mine sites worldwide. He has also served as a specialist review consultant for many large international

mining projects. He is a leader in tailings and mine rock co-disposal that improves physical stability as well

as chemical stability for the control ARD/ML in long-term storage systems.

Dr. Wilson obtained his Ph.D. and M.Sc. from the University of Saskatchewan, College of Engineering and

has a B.E. from University of Manitoba, College of Engineering in Civil Engineering.

John Lupo, Ph.D, P.E.

Dr. John Lupo has over 40 years of experience in the field of geotechnical and geomechanics within the

mining industry and has worked in over 30 countries. He is the author is of over 65 technical articles in

mine rock and tailings management and risk mitigation strategies. He has been the lead designer and

technical reviewer of over 90 slurry, thickened, paste, filtered, and comingled tailings and mine rock

facilities and has led the development of several unique testing and analysis methods to help predict the

behaviour of tailings under various placement and loading conditions.

Dr. Lupo obtained his Ph.D. in Geological Engineering in Mining from the Colorado School of Mines and

has a M.S. Civil Engineering and a B.S. Geological Engineering from the University of Utah.

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 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.).

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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

For further information, please contact:

Toll Free: 1 844 306 8827 | Email: [email protected]

Paul Morris | Director, Investor Relations | Email: [email protected]

Cautionary Note Regarding Forward-Looking Statements

This news release includes certain “ forward-looking information” and “ forward-looking statements” (collectively

“forward-looking statements”) within the meaning of applicable Canadian and United States securities legislation

including the United States Private Securities Litigation Reform Act of 1995. These forward- looking statements are

made as of the date of this n ews release. Forward -looking statements are frequently, but not always, identified by

words such as “ expects”, “anticipates”, “believes”, “plans”, “projects”, “ intends”, “estimates”, “envisages”,

“potential”, “possible”, “strategy”, “goals”, “opportunities”, “objectives”, or variations thereof or stating that certain

actions, events or results “may”, “could”, “would”, “might” or “will” be taken, occur or be achieved, or the negative

of any of these terms and similar expressions.

Forward-looking statements in this news release relate to future events or future performance and reflect current

estimates, predictions, expectations or beliefs regarding future event s. All forward-looking statements are based on

First Mining's or its consultants' current beliefs as well as various assumptions made by them and information

currently available to them. There can be no assurance that such statements will prove to be accurate, and actual

results and future events could differ materially from t hose anticipated in such statements. Forward- looking

statements reflect the beliefs, opinions and projections on the date the statements are made and are based upon a

number of assumptions and estimates that, while considered reasonable by the respective parties, are inherently

subject to significant business, economic, competitive, political and social uncertainties and contingencies. Such

factors include, without limitation, the Company’s business, operations and financial condition potentially being

materially adversely affected by the outbreak of epidemics, pandemics or other health crises, and by reactions by

government and private actors to such outbreaks; risks to employee health and safety as a result of the outbreak of

epidemics, pandemics or other health crises, that may result in a slowdown or temporary suspension of operations

at some or all of the Company's mineral properties as well as its head office; fluctuations in the spot and forward

price of gold, silver, base metals or certain other commo dities; fluctuations in the currency markets (such as the

Canadian dollar versus the U.S. dollar); changes in national and local government, legislation, taxation, controls,

regulations and political or economic developments; risks and hazards associated w ith the business of mineral

exploration, development and mining (including environmental hazards, industrial accidents, unusual or unexpected

formations, pressures, cave-ins and flooding); the presence of laws and regulations that may impose restrictions o n

mining; employee relations; relationships with and claims by local communities, indigenous populations and other

stakeholders; availability and increasing costs associated with mining inputs and labour; the speculative nature of

mineral exploration and development; title to properties.; and the additional risks described in the Company’s Annual

Information Form for the year ended December 31, 202 3 filed with the Canadian securities regulatory authorities

under the Company’s SEDAR+ profile at www.sedarplus.ca.

First Mining cautions that the foregoing list of factors that may affect future results is not exhaustive. When relying

on our forward -looking statements to make decisions with respect to First Mining, investors and others should

carefully consider the foregoing factors and other uncertainties and potential events. First Mining does not undertake

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to update any forward- looking statement, whether written or oral, that may be made from time to time by the

Company or on our behalf, except as required by law.