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First Mining Announces Year-End 2024 Financial Results and Operating Highlights

Production Results Financials

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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NEWS RELEASE

First Mining Announces Year-End 2024 Financial Results

and Operating Highlights

March 31, 2025 – Vancouver, Canada – First Mining Gold Corp. (“First Mining” or the “Company”) (TSX:

FF) (OTCQX: FFMGF) (FRANKFUR T: FMG) reports its fourth quarter and annual financial results for the year

ended December 31, 2024 . The audited consolidated financial statements and management’s discussion

and analysis (“MD&A”) , and annual information form (“AIF”) are available on First Mining’s website at

www.firstmininggold.com/investors/reports-filings/financials/ and have been posted under the Company’ s

profile on SEDAR+ at www.sedarplus.ca and EDGAR at www.sec.gov .

2024 and Q4 2024 Highlights:

• As of December 31, 2024, the Company’s cash and current investments balance was $13.7 million

and the equity interest in PC Gold Inc. (Pickle Crow Project) was $21.5 million.

• On December 3, 2024, the Company announced positive Federal Conformity Determination f rom the

Impact Assessment Agency of Canada for the Springpole Gold Project Final EIS.

• On November 21, 2024, the Company announced exploration drill results from the Buzz and North

Zone expansion targets, with hole DUP24-028 from the Buzz Zone returning 1.55 g/t Au over 15.4 m,

including 3.08 g/t Au over 5.3 m, and Hole DUP24-032 from the North Zone returning 4.00 g/t Au over

5.7 m, including 6.65 g/t Au over 2.0 m.

• On November 19, 2024, the Company announced an Eastern Extension resource growth opportunity

at the Springpole Gold Project with initial results from the 2024 East Extension diamond drilling

program, including 0.83 g/t Au and 8.02 g/t Ag over 52.50 m, and 0.61 g/t Au and 4.66 g/t Ag over

46.50 m from drill hole SP24-007.

• On November 13, 2024, The Company announced the establishment and positive initial review by a

best practice Independent Geotechnical and Tailings Review Board for the Springpole Gold Project.

• On November 5, 2024, the Company announced the submission of the Final Environmental Impact

Statement / Environment Assessment (“EIS/EA”) for the Springpole Gold Project. The final EIS/EA

incorporates over 14 years of research and data collection and includes several optimizations

completed since the release of the Pre-Feasibility Study. The submission reflects multiple scientific

and engineering disciplines to achieve a sustainable Project that will both protect the environmen t

and deliver tremendous socio -economic and infrastructure benefits. Through advancement in

Project designs, analysis shows that all regulatory requirements will be met by the Project, including

fish habitat offsetting and water quality that will meet stringent Canadian Water Quality Guidelines

during all phases of the Project. The input received from all parties during the draft EIS/EA review

helped inform the optimizations made for the final EIS/EA.

• On October 31, 2024, the Company announced that it has entered into a Process Agreement with

Cat Lake First Nation and Lac Seul First Nation which provides important capacity support for the

implementation of a community-based Anishinaabe-Led Impact Assessment.

• On October 10, 2024, the Company completed a non- brokered private placement offering (the

“Private Placement Offering”) raising aggregate gross proceeds of $7,352,600, which consisted of

54,463,706 units (the “Private Placement Units ”) of the Company at a price of $0.135 per Private

Placement Unit. Each Private Placement Unit consisted of one common share of the Company and

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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one-half of one common share purchase warrant (each whole common share purchase warrant, a

“Private Placement Warrant”). Each Private Placement Warrant entitles the holder to acquir e o n e

common share of the Company at an exercise price of $0.20 per common share for a period of 36

months following the closing date of the Private Placement Offering.

• On September 26, 2024, the Company completed a brokered bought deal public offering (the

“Bought Deal Offering ”) raising aggregate gross proceeds of $8,050,023 which consisted of

59,629,800 units (the “Bought Deal Units”) of the Company at a price of $0.135 per Bought Deal

unit. Each Bought Deal Unit consisted of one common share and one -half of one common share

purchase warrant (each whole common share purchase warrant, a “ Bought Deal Warrant ”). Each

Bought Deal Warrant entitles the holder to acquire one common share of the Company at an exerci s e

price of $0.20 per common share for a period of 36 months following the closing date of the Bought

Deal Offering.

• On September 9, 2024, the Company announced new assay results for the Challenger high- grade

gold discovery at its Birch -Uchi Greenstone Belt Exploration Project. The Challenger target area is

located 12 km southwest of the Springpole Gold Project and has become one of several high priority

exploration targets for the Company.

• On June 27, 2024, the Company published its third annual Environmental, Social and Governance

(“ESG”) Report for the 2023 year highlighting the Company’s ESG commitments, practices and

performance.

• On June 14, 2024, the Company completed a non- brokered private placement for aggregate gross

proceeds of $6,950,000 consisting of 31,212,121 flow -through shares (“FT Shares”) for the

purposes of the Income Tax Act (Canada) at a price of $0.165 per FT Share, and 10,000,000 Quebec

flow-through shares that qualify as flow-through shares for the purposes of the ITA and the Taxation

Act (Quebec)(the “Quebec FT Shares”) at a price of $0.18 per Quebec FT Share .

• Lisa Peterson, CPA, CA, the Company ’s Chief Financial Officer and Corporate Secretary , will be

taking maternity leave starting on or about April 4, 2025, with an expected return in October 2025.

o Darren Prins, CPA, CA , has been appointed interim Chief Financial Officer of the Company

effective March 31, 2025. Mr. Prins has extensive experience in capital markets, financial

reporting, risk management, and tax planning.

o Richard Huang, the Company’s Vice President , Corporate Development, will assume the

role of Corporate Secretary, in addition to his current role.

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.).

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

Silver Corp.

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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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 news release. Forward-looking statements are frequently, but not always, identified by words such

as “expects”, “anticipates”, “believes”, “plan s”, “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 events. All forward-looking statements are based on First

Mining's or its co nsultants' 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 those 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 commodities;

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 environm ental 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 4 filed with the

Canadian securities regulatory authorities under the Company’s SEDAR+ profile at www.sedarplus .ca, and in the

Company’s Annual Report on Form 40-F filed with the SEC on EDGAR.

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 carefull y

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