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First Mining Announces 2025 Third Quarter Financial Results and Operating Highlights

Production Results Financials

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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NEWS RELEASE

First Mining Announces 2025 Third Quarter Financial Results

and Operating Highlights

November 13, 2025 – Vancouver, Canada – First Mining Gold Corp. (“First Mining” or the “Company”)

(TSX: FF) (OTCQX: FFMGF) (FRANKFURT: FMG) reports its third quarter financial results for the quarter ended

September 30, 2025 . The financial statements and management’s discussion and analysis (“MD&A”) 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.

Q3 2025 Highlights:

• On July 3, 2025, Mishkeegogamang First Nation and the Company announced that they signed a Long-

Term Relationship Agreement (“Agreement” or “LTRA”) covering the Springpole Gold Project, located

in northwestern Ontario. The Agreement sets out a collaborative approach for the development of one

of Canada’s largest gold resources, through construction, operations, and closure, in a manner that

respects the environment and provides direct benefits to the First Nation.

• On July 22, 2025, the Company closed an upsized marketed public offering of 66,670,000 units for total

gross proceeds of $12,000,600 (the “ Public Offering”). O n August 5, 2025, the Company closed an

upsized non-brokered offering of 95,000,000 units for proceeds of $17,100,000 and 33,350,000 flow -

through units for proceeds of $7,337,000 (the “Non-Brokered Offering”). The total proceeds of the Non-

Brokered Offering and Public Offering was $36,437,600.

• On July 31, 2025, the Company sold its remaining 20% project interest in the Hope Brook Gold Project for

total consideration comprised of $3 million in cash and 7 million common shares of Big Ridge.

• On September 8, 2025, the Company announced additional drilling results from the 2025 exploration

program at Duparquet. Highlights from the drilling include the continued advancement of the Aiguille

discovery zone. Drill hole DUP25-058 returned 1.43 g/t Au over 24.1m, including 4.56 g/t Au over 4.0m,

further extending the target eastward along strike.

• On September 18, 2025, the Company announced the signing of a historic Memorandum of

Understanding with the City of Duparquet to support Community Development and Collaboration on the

Duparquet Gold Project.

• On September 24, 2025, the Company announced results from the 2025 Duparquet drilling program with

the expansion of the newly discovered Miroir Target with drill hole DUP25-064 Returning 3.23 g/t Au over

25.9m. On November 10, 2025, the Company announced additional results at the Miroir target including

Drill hole DUP25-078 returning 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.

• Lisa Peterson, CPA, CA, will resume her role as the Company’s Chief Financial Officer (“CFO”) following

the completion of her maternity leave, effective November 14, 2025. During her absence, Darren Prins,

CPA, CA, served as Interim CFO of the Company and Richard Huang, the Company’s Vice President,

Corporate Development, was appointed Corporate Secretary, in addition to his current role, effective

April 1, 2025.

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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• First Mining is pleased to announce that Vincy Benjamin will be joining the Company as Director of

Projects effective November 24, 2025 . Mr. Benjamin was previously Director of Engineering &

Construction for Skeena Resources and prior to that, Director of Projects for Sabina Gold & Silver. He

brings 25 years of experience leading the full lifecycle of major capital projects from feasibility and

financing through construction, commissioning, and operational handover.

• During the quarter, the Company continued engagement with local and Indigenous communities around

the Springpole Gold P roject while advancing responses to comments in the Federal and Provincial

Environmental Assessment processes.

• As of September 30, 2025, the Company’s cash and marketable securities balance was $ 37.6 million

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

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 30% project interest in the Pickle Crow Gold Project.

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 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 and include, but are not limited to, statements

with respect to the closing of the Transaction, First Mining’s exposure to Hope Brook, and First Mining’s plans related to

its Springpole, Duparquet and other projects . All forward -looking statements are based on First Mining's or its

consultants' current beliefs as well as va rious 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

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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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 ability to

close the Transaction, 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 with the business of mineral exploration, development and mining

(including environmental hazards, industrial accidents, unusual or unexpected formations, pressures, cav e-ins and

flooding); the presence of laws and regulations that may impose restrictions on 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, 2024 filed with the Canadi an 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 carefully

consider the for egoing 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.