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

First Mining Announces Closing of $12 Million Public Offering

VANCOUVER, BC, July 22, 2025 /CNW/ - First MiningGold Corp. ("First Mining" or the "Company") (TSX: FF) (OTCQX: FFMGF) (FRANKFURT: FMG) is pleased to announce the closing of its previously announced over-subscribed public offering (the "Public Offering") of 66,670,000 units of the Company (the "Units") at a price of $0.18 per Unit (the "Unit Offering Price") for aggregate gross proceeds to the Company of $12,000,600.

The Public Offering was completed pursuant to an agency agreement dated July 16, 2025, among the Company and a syndicate of placement agents.

Each Unit is comprised of one common share of the Company (a "Unit Share") and one-half of one common share purchase warrant (each whole common share purchase warrant, a "Warrant"). Each Warrant will entitle the holder to acquire one common share of the Company at a price of $0.27 per share at any time prior to the date which is 36 months following the closing date.

The Public Offering was conducted by way of a prospectus supplement dated July 16, 2025 (the "Supplement") to the Company's base shelf prospectus dated January 23, 2024 (the "Shelf Prospectus") in each of the provinces and territories of Canada (excluding Quebec).

The net proceeds from the sale of Units under the Public Offering will be used to advance First Mining's Springpole and Duparquet gold projects, as well as for general working capital and corporate purposes, as disclosed in the Supplement.

The Units offered have not been registered under the U.S. Securities Act of 1933, as amended, and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements. This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of the Units in any jurisdiction in which such offer, solicitation or sale would be unlawful.

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 eventsand include, but are not limited to, the use of the proceeds of the Public Offering and the Company's plans for its mineral projects. 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.

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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: info@firstmininggold.com; Paul Morris | Director, Investor Relations | Email: paul@firstmininggold.com

CO: First Mining Gold Corp.

CNW 08:40e 22-JUL-25