Thunder Mountain Gold appoints Ron Clayton as director

Item 3.02 Unregistered Sales of Equity Securities.

To the extent required by Item 3.02 of Form 8-K, the information set forth in Item 5.02 of this Current Report on Form 8-K is incorporated herein by reference.¹ The transaction is relying on the exemption from registration provided by Section 4(a)(2) of the United States Securities Act of 1933 , as amended (the " U.S. Securities Act ") and applicable exemptions from state securities registration requirements.

SECTION 5 - CORPORATE GOVERNANCE AND MANAGEMENT

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Thunder Mountain Gold, Inc. (the " Company ") appointed Mr. Ron Clayton as a director of the Company effective October 1, 2026.

As a result, the Company's current directors and officers are as follows:

Name

Position

Eric Jones

President, Chief Executive Officer and Director

Ron Clayton

Director

James A. Sabala

Director

Ralph Noyes

Director (Chairman)

Douglas J. Glaspey

Director

Megan Anderson

Chief Financial Officer

Rocky Chase

Vice-President of Operations

Steve Osterberg

Senior Vice President of Exploration

Mr. Clayton brings more than 40 years of mining industry experience across underground and open- pit operations, executive leadership, corporate governance, safety, environmental stewardship, sustainability, exploration, development, and production.¹ His career spans site operations, project development, corporate management, and public-company board oversight. His career includes leadership responsibilities in Nevada, Idaho, Washington, Colorado, Manitoba, and other mining jurisdictions.

Mr. Clayton currently serves as Chairman of the Board of i-80 Gold Corporation since March 2021 and as Chairman of its Technical, Safety, Environmental and Sustainability Committee. Mr. Clayton previously acted as President and Chief Executive Officer of 1911 Gold Corporation (January 2019 to March 2022) and as a director of 1911 Gold Corporation (December 2018 to May 2022), a director of Gold Standard Ventures Corporation (January 2018 to August 2022). He also served as a director of Mayfair Gold Corporation, President, Chief Executive Officer and a director of Tahoe Resources Inc., Chief Operating Officer of Tahoe Resources Inc. and Chief Operating Officer of Hecla Mining Co.

Mr. Clayton holds a Bachelor of Science in Mining Engineering from the Colorado School of Mines and completed the Tuck Executive Education Program at Dartmouth.⁵

The press release and this Current Report on Form 8-K do not constitute an offer to sell or a solicitation of an offer to buy any security, and shall not constitute an offer, solicitation or sale in any jurisdiction in which such offering, solicitation or sale would be unlawful.

Compensation

In connection with Mr. Clayton's appointment as a director of the Company, the Company has granted Mr. Clayton 400,000 stock options (the " Options ") under the Company's 2014 Stock Option Plan² to purchase up to 400,000 shares of common stock of the Company (each, an " Option Share ") at an exercise price of $0.75 per Option Share for a period of five years from the date of grant of October 1, 2026 expiring on September 30, 2031, subject to the approval of the TSX Venture Exchange (the " Exchange "). The Options vest immediately upon grant.

All securities issued to Mr. Clayton will be issued in reliance on the exemption from registration provided by Section 4(a)(2) of the U.S. Securities Act and applicable exemptions from state securities registration requirements, and will be issued as "restricted securities" (as defined in Rule 144 under the U.S. Securities Act). In addition, such securities will be subject to an Exchange four-month hold period.

No Family Relationships with Existing Directors or Executive Officers

Mr. Clayton is not related to any existing director or executive officer of the Company, and, except as disclosed in this current report, the Company has neither nominated nor chosen any other person (whether related to Mr. Clayton or otherwise) to become a director or executive officer of the Company.

No Related Party Transactions

There are no transactions involving the Company and Mr. Clayton that are required to be reported pursuant to Item 404(a) of Regulation S-K. Mr. Clayton has not been party to any transaction with the Company since the beginning of the Company's last fiscal year, and is not party to any proposed transaction with the Company, involving an amount exceeding $120,000 and in which he had or will have a direct or indirect material interest.

No legal proceedings

Mr. Clayton has not been involved in any legal proceedings required to be disclosed pursuant to Item 401(f) of Regulation S-K during the past ten years.

SECTION 8 - OTHER EVENTS

Item 9.01. Financial Statements and Exhibits.

99.1³

News Release dated October 5, 2026 re: Thunder Mountain Gold Strengthens Board with Appointment of Veteran Mining Executive Ron Clayton³

104

Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

THUNDER MOUNTAIN GOLD, INC.

DATE: November 4, 2026

By:

/s/ ERIC JONES

Eric Jones

President and Chief Executive Officer

THUNDER MOUNTAIN GOLD INC.

TSX-V: THM OTCQB: THMG

11770 W. President Dr., Ste. F

Boise, Idaho 83713

phone : (208) 658-1037

NEWS RELEASE

Thunder Mountain Gold Strengthens Board with Appointment of Veteran Mining Executive Ron Clayton

FOR IMMEDIATE RELEASE

Boise, Idaho USA - October 5, 2026 - Thunder Mountain Gold Inc. (the "Company") is pleased to announce the appointment of Ron Clayton to its Board of Directors, effective October 1, 2026. Mr. Clayton brings more than 40 years of mining industry experience across underground and open-pit operations, executive leadership, corporate governance, safety, environmental stewardship, sustainability, exploration, development, and production.

Mr. Clayton currently serves as Chairman of the Board of i-80 Gold Corporation and as Chairman of its Technical, Safety, Environmental and Sustainability Committee.⁴ He previously served as President, Chief Executive Officer and a director of Tahoe Resources Inc.; President, Chief Executive Officer and a director of 1911 Gold Corporation; and in senior operating leadership roles with Hecla Mining Company, Stillwater Mining Company, and Climax Molybdenum Company. His career spans site operations, project development, corporate management, and public-company board oversight.

"Mr. Clayton's extensive operating experience and record of executive and board leadership will add valuable perspective as Thunder Mountain Gold advances its strategy," said Eric T. Jones, President and CEO Thunder Mountain Gold Inc. "His technical knowledge, governance experience, and commitment to responsible mining will strengthen the Board and support the Company's long-term objectives."

"I am pleased to join the Board of Thunder Mountain Gold and look forward to working with my fellow directors and the management team," said Mr. Clayton. "I welcome the opportunity to contribute my operating and governance experience as the Company pursues its priorities and works to create long-term value for shareholders."

Mr. Clayton holds a Bachelor of Science in Mining Engineering from the Colorado School of Mines and completed the Tuck Executive Education Program at Dartmouth. His career includes leadership responsibilities in Nevada, Idaho, Washington, Colorado, Manitoba, and other mining jurisdictions.

Website: www.thundermountaingold.com

OTCQB: THMG | TSX-V: THM

Regarding Thunder Mountain Gold, Inc.

Thunder Mountain Gold Inc., founded in 1935, is a junior exploration company focused on advancing base and precious metals assets in the western United States. The Company's principal asset is the South Mountain Mine, a historic former Anaconda Copper Company development of zinc, silver, gold, lead, and copper located on private land in Owyhee County, Idaho. Thunder Mountain Gold also owns 100% of the Trout Creek Project, a gold exploration asset in Nevada adjacent to and surrounded by Nevada Gold Mines, a Barrick-Newmont joint venture. With a growing land position, established project infrastructure, and exposure to both critical and precious metals, Thunder Mountain Gold offers investors leverage to exploration success in premier U.S. mining jurisdictions. For more information, please visit the Company's website at www.Thundermountaingold.com, www.SEC.gov, and www.sedarplus.ca .

Cautionary Note to Investors

This news release is intended for release in the United States only. Neither the TSX Venture Exchange, the OTCQB, nor either of its Regulation Services Provider accepts responsibility for the adequacy or accuracy of this release.

For further information, please contact:

Thunder Mountain Gold, Inc.

Eric T. Jones

President and Chief Executive Officer

Eric@thundermountaingold.com

Office: (208) 658-1037

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