FFMGF 6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANTTO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of July 2025

Commission File Number: 000-55607

First MiningGold Corp.

(Translation of registrant's name into English)

Suite 2070, 1188 West Georgia Street, Vancouver, B.C., V6E4A2

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☐     Form 40-F ☒

DOCUMENTS FILED AS PART OF THIS FORM 6-K

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Exhibit 99.1

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

MISHKEEGOGAMANG FIRST NATION, ON, July 3, 2025 /CNW/ - Mishkeegogamang First Nation ("Mishkeegogamang", or the "First Nation") and First Mining Gold Corp. ("First Mining" or the "Company") (TSX: FF) (OTCQX: FFMGF) (FRANKFURT: FMG) are 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-yearprocess of technical review, traditional knowledge study and relationship building with First Mining. The agreement ensures that Mishkeegogamang'sinterests will be represented in the development and operation of the Springpole Project and will deliver long term value by creatingconcrete opportunities for our community and our members. Together with First Mining, we are shaping the direction of a modern and long-termcollaboration that is in keeping with our values."

Dan Wilton, CEO of First Mining, stated:

"I would like to thank the Mishkeegogamangcommunity and their leadership for the many years of hard work that they have put into information sharing, understanding and helpingus shape and improve the plans for Springpole. This modern agreement provides clear avenues for Mishkeegogamang's participation inthe development and operation of the Project from an environmental, cultural, economic and business opportunities perspective. We thankthe leadership of Mishkeegogmang for their openness, collaboration and trust and look forward to continuing to advance the Projectas long-term partners."

Following a process 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 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 other 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

Cautionary Note Regarding Forward-Looking Statements

This news release includes certain "forward-lookinginformation" and "forward-looking statements" (collectively "forward-looking statements") within the meaningof applicable Canadian and United States securities legislation including the United States Private Securities Litigation Reform Act of1995. These forward-looking statements are made as of the date of this news release. Forward-looking statements are frequently, but notalways, 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 orresults "may", "could", "would", "might" or "will" be taken, occur or be achieved, orthe negative of any of these terms and similar expressions.

Forward-looking statements in this news releaserelate 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 bythem and information currently available to them. There can be no assurance that such statements will prove to be accurate, and actualresults 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 consideredreasonable by the respective parties, are inherently subject to significant business, economic, competitive, political and social uncertaintiesand contingencies. Such factors include, without limitation the Company's business, operations and financial condition potentially beingmaterially adversely affected by the outbreak of epidemics, pandemics or other health crises, and by reactions by government and privateactors 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 itshead office; fluctuations in the spot and forward price of gold, silver, base metals or certain other commodities; fluctuations inthe 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, developmentand 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 localcommunities, 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'sAnnual Information Form for the year ended December 31, 2024 filed with the Canadian securities regulatory authorities under the Company'sSEDAR+ 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 offactors that may affect future results is not exhaustive. When relying on our forward-looking statements to make decisions with respectto First Mining, investors and others should carefully consider the foregoing factors and other uncertainties and potential events. FirstMining does not undertake to update any forward-looking statement, whether written or oral, that may be made from time to time by theCompany 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 prepare the technical information contained herein in accordancewith the requirements of the securities laws in effect in Canada, which differ from the requirements of the securities laws currentlyin effect in the United States. Accordingly, information concerning mineral deposits set forth herein may not be comparable with informationmade public by companies that report in accordance with U.S. standards.

Technical disclosure contained in this news releasehas not been prepared in accordance with the requirements of United States securities laws and uses terms that comply with reporting standardsin Canada with certain estimates prepared in accordance with NI 43-101.

NI 43-101 is a rule developed by the Canadian SecuritiesAdministrators that establishes standards for all public disclosure an issuer makes of scientific and technical information concerningthe issuer's material mineral projects.

SOURCE First Mining Gold Corp.

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%CIK: 0001641229

For further information: For further information, please contact: Toll Free: 1 844 306 8827, Email: [email protected]; Paul Morris, Director, Investor Relations, Email: [email protected]

CO: First Mining Gold Corp.

CNW 16:00e 03-JUL-25