First Mining Gold added to MVIS junior miners index

Rhea-AI Filing Summary

First Mining Gold Corp. (FFMGF) reports that it has been added to the MVIS Global Junior Gold Miners Index (MVGDXJ), the benchmark index for the VanEck Junior Gold Miners ETF (GDXJ), effective at the close of trading on September 18, 2026 following the index’s semi-annual review and rebalancing. The company states that it believes this inclusion will enhance its visibility with institutional and retail investors, improve trading liquidity, and increase exposure to global capital markets as it advances its gold projects in Ontario and Quebec. First Mining highlights its Springpole Gold Project in northwestern Ontario, where the federal Environmental Assessment was approved in June 2026, the Duparquet Gold Project in Quebec, its 20% interest in the Pickle Crow Gold Project in Ontario, and its large equity interest in Seva Mining Corp.

Key Figures

Index inclusion effective date: September 18, 2026 Pickle Crow Gold Project interest: 20% project interest Revenue/resource threshold for MVGDXJ: 50% +2 more

5 metrics

Index inclusion effective date September 18, 2026 Date First Mining Gold is added to the MVIS Global Junior Gold Miners Index at the close of trading

Pickle Crow Gold Project interest 20% project interest First Mining’s ownership stake in the Pickle Crow Gold Project in Ontario

Revenue/resource threshold for MVGDXJ 50% Companies must derive at least 50% of revenue or mineral resources from gold or silver to be included in MVGDXJ

Federal Environmental Assessment approval date June 2026 Month and year the federal Environmental Assessment for the Springpole Gold Project was approved

Year First Mining was established 2015 Year First Mining Gold Corp. was founded by Keith Neumeyer

Key Terms

MVIS Global Junior Gold Miners Index, VanEck Junior Gold Miners ETF, Environmental Assessment, Multi-Jurisdictional Disclosure System, +1 more

5 terms

MVIS Global Junior Gold Miners Index financial

"added to the MVIS® Global Junior Gold Miners Index ("MVGDXJ")"

VanEck Junior Gold Miners ETF financial

"underlying benchmark index for the VanEck Junior Gold Miners ETF ("GDXJ")"

Environmental Assessment regulatory

"where the federal Environmental Assessment for the Springpole Project was approved"

An environmental assessment is a process that evaluates how a project or activity might impact the natural surroundings, such as air, water, land, and wildlife. It helps identify potential environmental risks and ensures that any negative effects are managed or minimized. For investors, this assessment provides insight into the sustainability and long-term viability of projects, which can influence their financial decisions and risk management.

Multi-Jurisdictional Disclosure System regulatory

"eligible to rely upon the Canada-U.S. Multi-Jurisdictional Disclosure System"

A multi-jurisdictional disclosure system is a coordinated filing and publication process that lets companies share required financial, regulatory, or corporate information across several legal regions at once. Think of it like posting the same important notice on multiple community bulletin boards simultaneously so everyone who needs it — investors, regulators, and markets in different countries — sees the same, timely details. For investors this matters because it reduces delays and inconsistencies, making it easier to compare risks and make informed decisions when securities trade in more than one place.

NI 43-101 technical

"prepared in accordance with NI 43-101"

A Canadian regulatory standard that sets the rules for how mining and exploration companies must report mineral resources and reserves, requiring technical reports prepared or signed off by an independent, certified expert. It matters to investors because it creates a consistent, transparent “inspection report” for mining projects, making it easier to compare prospects, judge the reliability of claims, and assess geological and financial risk before investing.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What index has First Mining Gold Corp. (FFMGF) been added to?

First Mining Gold Corp. has been added to the MVIS Global Junior Gold Miners Index (MVGDXJ), which is the benchmark index for the VanEck Junior Gold Miners ETF (GDXJ), effective at the close of trading on September 18, 2026.

When does First Mining Gold’s inclusion in the GDXJ-related index become effective?

First Mining’s inclusion in the MVIS Global Junior Gold Miners Index, the benchmark for the GDXJ ETF, becomes effective at the close of trading on September 18, 2026, following the index’s semi-annual review and rebalancing.

Why does First Mining Gold (FFMGF) view inclusion in the GDXJ index as important?

The company states it believes inclusion in the MVGDXJ/GDXJ framework will enhance visibility among institutional and retail investors, improve trading liquidity, and increase exposure to global capital markets as it advances its gold projects in Ontario and Quebec.

What are the main projects First Mining Gold (FFMGF) is advancing?

First Mining is advancing the Springpole Gold Project in northwestern Ontario, where the federal Environmental Assessment was approved in June 2026, and the Duparquet Gold Project in Quebec, a PEA-stage development project on the Destor-Porcupine Fault Zone.

What ownership interests does First Mining Gold (FFMGF) hold in other projects?

First Mining holds a 20% project interest in the Pickle Crow Gold Project in Ontario and a large equity interest in Seva Mining Corp., in addition to its Springpole and Duparquet gold development projects.

What criteria does the MVIS Global Junior Gold Miners Index use for inclusion?

The MVGDXJ includes small-cap companies where at least 50% of revenue comes from gold or silver mining, or at least 50% of mining mineral resources are from gold or silver, and tracks the performance of the most liquid companies in these industries.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 6-K: How Foreign Companies Report to the SEC →

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Available on EDGAR 09/14/2026 - 08:16 AM Accepted by SEC EDGAR 09/14/2026 - 08:15 AM Learn about SEC filing dates

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

Form 6-K

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

For the month of September 2026

Commission File Number: 000-55607

First Mining Gold Corp.
(Translation of registrant's name into English)

Suite 2070, 1188 West Georgia Street, Vancouver, B.C., V6E 4A2
(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

Exhibits	Description
99.1	Press Release dated September 14, 2026

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.

		First Mining Gold Corp.
		(Registrant)
Date: September 14, 2026		/s/ Richard Huang
		Richard Huang
		Vice President, Corporate Development & Corporate Secretary

 Exhibit 99.1

   

First Mining Announces Inclusion into the GDXJ

VANCOUVER, BC, Sept. 14, 2026 /CNW/ -- First Mining Gold Corp. ("First Mining" or the "Company") (TSX: FF) (OTCQX: FFMGF) (FRANKFURT: FMG) is pleased to announce that it has been added to the MVIS® Global Junior Gold Miners Index ("MVGDXJ"), the underlying benchmark index for the VanEck Junior Gold Miners ETF ("GDXJ").  Pursuant to the MVGDXJ's semi-annual review and rebalancing, First Mining's inclusion will be effective at the close of trading on September 18, 2026.  The GDXJ is a widely followed gold industry exchange traded fund that provides investors with exposure to a portfolio of the most liquid junior gold and silver mining, development and exploration companies.

"We believe our inclusion in the GDXJ will enhance First Mining's visibility among institutional and retail investors, improve trading liquidity, and increase our exposure to global capital markets as we continue to advance our gold projects in Ontario and Quebec," stated Dan Wilton, CEO of First Mining. "This is an exciting step forward for the Company and our shareholders."

About MVGDXJ

The MVIS^® Global Junior Gold Miners Index tracks the performance of the most liquid small-cap companies in the global gold and silver mining industries. This is a modified market cap-weighted index, and only includes companies that generate at least 50% of their revenue from gold or silver mining, or at least 50% of their mining mineral resources are from gold or silver.

About GDXJ

VanEck Junior Gold Miners ETF seeks to replicate as closely as possible, before fees and expenses, the price and yield performance of the MVGDXJ, which is intended to track the overall performance of small-capitalization companies that are involved primarily in the mining for gold and/or silver.

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 the federal Environmental Assessment for the Springpole Project was approved in June 2026, 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 a 20% project interest in the Pickle Crow Gold Project in Ontario and large equity interest in Seva Mining Corp.

First Mining was established in 2015 by Mr. Keith Neumeyer, founder 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-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", "plans", "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 in this news release include, but are not limited to, statements with respect to: liquidity of the GDXJ; feasibility and permitting activities related to the Springpole Gold Project; realizing the value of the Company's gold projects for the Company's shareholders; Company's business strategy; future planning processes. Statements concerning proven and probable mineral reserves and mineral resource estimates may also be deemed to constitute forward-looking statements to the extent that they involve estimates of the mineralization that will be encountered as and if the property is developed, and in the case of measured and indicated mineral resources or proven and probable mineral reserves, such statements reflect the conclusion based on certain assumptions that the mineral deposit can be economically exploited. 

Forward-looking statements reflect the beliefs, opinions and projections of management 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, including 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; requirements for additional capital; changes in project parameters as plans continue to be refined; variations in ore reserves, grade or recovery rates; actual performance of plant, equipment or processes relative to specifications and expectations; risks and hazards associated with the business of mineral exploration, development and mining (including environmental hazards, industrial accidents, unusual or unexpected formations, pressures, cave-ins and flooding); effectiveness of environmental mitigations and strategies including production of NAG and PAG tailings and mine rock and water management strategies,  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, 2025 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 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. 

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 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 concerning mineral deposits set forth herein may not be comparable with information made public by companies that report in accordance with U.S. standards.

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.

View original content to download multimedia:https://www.prnewswire.com/news-releases/first-mining-announces-inclusion-into-the-gdxj-302877096.html

SOURCE First Mining Gold Corp.

View original content to download multimedia: http://www.newswire.ca/en/releases/archive/September2026/14/c7519.html

%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 07:00e 14-SEP-26

Filing Exhibits & Attachments

1 document

Press Releases

• EX-991 NEWS RELEASE DATED SEPTEMBER 14, 2026 13.8 KB