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Mishkeegogamang First Nation and First Mining Sign Long Term Relationship Agreement for the Development of the Springpole Gold Project

Partnerships & JV

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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NEWS RELEASE

Mishkeegogamang First Nation and First Mining Sign Long Term Relationship

Agreement for the Development of the Springpole Gold Project

• Agreement setting out the significant participation of Mishkeegogamang First Nation in the responsibl e

development of the Springpole Gold Project in a way that seeks to minimize impacts on the environment

and provides direct benefits to the community

• Enhanced collaboration on aspects related to the environment, training, employment, business

opportunities, and financial benefits

• Agreement signed following a community-based consultation process

• Commitment to a long -term, mutually beneficial relationship based on respect, inclusion, sustainability

and responsibility

July 3, 2025 – Mishkeegogamang First Nation, Ontario, Canada – Mishkeegogamang First Nation

(“Mishkeegogamang”, or the “First Nation”) and First Mining Gold Corp. (“First Mining” or the “Company”)

(TSX: FF) (OTCQX: FFMGF) (FRANKFURT: FMG) a re proud to announce that they have signed a Long Term

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

Project”, or the “ 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.

Merle Loon, Chief of Mishkeegogamang First Nation, stated:

“This agreement is the result of a five -year process of technical review, traditional knowledge study and

relationship building with First Mining. The agreement ensures that Mishkeegogamang’s interests will be

represented in the development and operation of the Springpole Project and will deliver long term value by

creating concrete opportunities for our community and our members. Together with First Mining, we are

shaping the direction of a modern and long-term collaboration that is in keeping with our values.”

Dan Wilton, CEO of First Mining, stated:

“I would like to thank the Mishkeegogamang community and their leadership for the many years of hard work

that they have put into information sharing, understanding and helping us shape and improve the plans for

Springpole. This modern agreement provides clear avenues for Mishkeegogamang’s participation in the

development and operation of the Project from a n environmental, cultural, economic and business

opportunities perspective. We thank the leadership of Mishkeegogmang for their openness, collaboration and

trust and look forward to continuing to advance the Project as long-term partners.”

Following a p rocess agreement signed in 2021 between Mishkeegogamang and First Mining, the LTRA was

negotiated along with a community-based consultation process to ensure that the interests and concerns of

the First Nation were taken into account. The LTRA includes provisions for Mishkeegogamang to take part in

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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the Project’s environmental management and monitoring, the implementation of adaptive management and

preferential training and employability measures, equity and participation in the economic upside of the

Project, the promotion of business opportunities during the mine’s construction and operations, as well as

the recognition of Anishnaabe culture and the inclusion of cultural safety measures. The LTRA also sets out

the sharing of financial benefits from the Springpole Project.

About Mishkeegogamang First Nation

The people of Mishkeegogamang Ojibway Nation live in northwestern Ontario, around the area where the

Albany River meets Lake St. Joseph. Today, just over 900 people live on its two reserves, while about 500 live

off the reserve, either on Crown Land or in o ther communities. The traditional territory of the

Mishkeegogamang Ojibway extends to the north, south, east and west, beyond the boundaries of Reserves

63A and 63B. The traditional territory is made up of the communities of the Main Reserve, Bottle Hill, Poplar

Heights, Sandy Road, Doghole Bay, Rat Rapids, Cedar Rapids, Ten Houses, Eric Lake, Ace Lake, Metcalfe,

Pashkokogan, Mile 50, Fitchie Lake, Mile 42, Mile 29, Menako, and the shores of Lake St. Joseph.

Mishkeegogamang changed back to its real name from “Osnaburgh” on November 15, 1993 by Band Council

Resolution.

The Sucker, Loon, Caribou, Sturgeon, and Bear clans are represented among Mishkeegogamang members.

About two-thirds of the people in Mishkeegogamang speak and understand Ojibwe. The language is written

in syllabics, and today it is also written using the English alphabet.

Mishkeegogamang is a signatory to the James Bay Treaty No. 9.

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.

ON BEHALF OF FIRST MINING GOLD CORP.

Daniel W. Wilton

Chief Executive Officer and Director

For further information, please contact:

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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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 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 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 mate rially 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 environmental hazards,

industrial accidents, unusual or unexpected formations, pressures, cave -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, 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 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.

Cautionary Note to United States Investors

The Company is a “foreign private issuer” as defined in Rule 3b -4 under the United States Securities Exchange Act of

1934, as amended, and is eligible to rely upon the Canada- U.S. Multi-Jurisdictional Disclosure System, and is therefore

permitted to prepar e the technical information contained herein in accordance with the requirements of the securities

laws in effect in Canada, which differ from the requirements of the securities laws currently in effect in the United States.

Accordingly, information concer ning mineral deposits set forth herein may not be comparable with information made

public by companies that report in accordance with U.S. standards.

TSX: FF

OTCQX: FFMGF

FRANKFURT: FMG

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Technical disclosure contained in this news release has not been prepared in accordance with the requirements of

United States securities laws and uses terms that comply with reporting standards in Canada with certain estimates

prepared in accordance with NI 43-101.

NI 43 -101 is a rule developed by the Canadian Securities Administrators that establishes standards for all public

disclosure an issuer makes of scientific and technical information concerning the issuer’s material mineral projects.