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Thunder Mountain Gold, Inc. Secures Additional US$1,200,000 (CAD$1,676,000) for South Mountain Project Exploration Program

Financings Exploration Programs

Thunder Mountain Gold, Inc. Secures

Additional US$1,200,000 (CAD$1,676,000) for

South Mountain Project Exploration Program

Boise, Idaho--(Newsfile Corp. - May 20, 2025) - Thunder Mountain Gold, Inc. (OTCQB: THMG) (TSXV:

THM) (the "Company") announces the successful completion of a non-brokered private placement on

May 16, 2025, raising US$1,200,000 (CAD$1,676,000) through the sale of 10,000,000 units at

US$0.12 (CAD$0.17) each.

Each unit consists of one common share and one-half warrant, exercisable at US$0.18 (CAD$0.25) for

a two-year term. The securities were sold exclusively to accredited investors, and no placement or

brokerage fees were incurred. In aggregate, the Company issued 10,000,000 shares and 5,000,000

warrants. There were no broker fees paid.

The Company plans to use the proceeds from the private placement to fund exploration at the South

Mountain Project in Idaho, and Trout Creek Project in Nevada, and for general working capital. The

proceeds will advance the South Mountain Project, the Company's flagship asset, funding ongoing

development activities and administrative costs to enhance the project's value.

"

We appreciate the continued support from our investors, which reflects confidence in the

potential of the South Mountain Project,"

commented Eric T. Jones, President and CEO of Thunder

Mountain Gold, Inc.

"This funding will provide further resources required to move forward with

critical development initiatives and continue adding value for our shareholders."

Terms of the Offering:

Total Raised: US$1,200,000 (CAD$1,676,000)

Unit Price: US$0.12 (CAD$0.17)

Includes:

1 common share

1/2 warrant (exercise price: US$0.18, valid for two years)

The securities offered in this private placement are subject to applicable exemptions under U.S. and

Canadian securities laws and cannot be offered or sold in the United States absent registration or an

applicable exemption from registration requirements. The shares, the warrants and any shares issued

pursuant to exercise of the warrants are "restricted securities" under the United States Securities Act of

1933, as amended (the "U.S. Securities Act"), and subject to a six month hold period prior to being

eligible for resale under the U.S. Securities Act.

In addition, the shares, the warrants and any shares

issued pursuant to exercise of the warrants are subject to a four-month hold period under Canadian

securities laws.

This press release does not constitute an offer to sell or a solicitation of an offer to buy these securities

in any jurisdiction where such offer, solicitation, or sale would be unlawful.

Regarding Thunder Mountain Gold, Inc.

Thunder Mountain Gold Inc., a junior exploration company founded in 1935, owns interests in base and

precious metals projects in the western U.S. The Company's principal asset is The South Mountain

Mine, a historic former Anaconda Mining 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 project located along the western flank of the Shoshone Mountain Range in the

Reese River Valley, adjacent to and surrounded by Nevada Gold Mines, a Barrick and Newmont Gold,

Inc. joint venture. For more information on Thunder Mountain Gold, please visit the Company's website at

www.Thundermountaingold.com

.

The South Mountain Project

The South Mountain Mine is a polymetallic development project containing high-grade zinc, silver, gold,

and copper, and is located on private land approximately 70 miles southwest of Boise, Idaho. The

Project is on private land, permitting has been, and should continue to be a clear-cut process. The

Project was intermittently mined from the late from 1940s to the late 1960s, most notably by Anaconda

Mining, with over 4,000 feet of underground workings that that have been rehabilitated, re-engineered,

and MSHA compliant. Thunder Mountain Gold Inc. purchased and advanced the project from 2007

through Present, with expenditures into the project of approximately US$25 million. Historic test mining

and processing at the Project has mostly come from high-grade CRD and skarn zones that remain open

at depth and along strike. According to historical smelter records, approximately 53,642 tons of

mineralized material have been mined and direct shipped to the smelter, with average grades;

14.5%

Zn, 10.6 o.p.t. Ag (363.42 g/t Ag), 0.058 o.p.t. Au

(

1.98 g/t Au), 1.4% Cu, and 2.4% Pb

were realized

(See SK-1300 Technical Resource Statement, and NI 43-101 Technical Report: Updated Mineral

Resource Estimate for the South Mountain Project, dated December 31, 2023, and December 15,

2023, respectively. More details are available at

www.thundermountaingold.com

,

and at

www.SEC.gov

,

and

www.sedar.com

).

Forward-Looking Statements

This press release contains forward-looking statements that are based on the beliefs of management

and reflect the Company's current expectations. The forward-looking statements in this press release

include statements with respect to the terms and use of proceeds of the Private Placement, the ability of

the Company to complete the Private Placement and the impact of the Private Placement on the

Company.

Generally, forward-looking statements can be identified by the use of forward-looking

terminology such as "plans", "expects", "is expected", "budget", "scheduled", "estimates", "forecasts",

"intends", "anticipates", "believes" or variations of such words and phrases or statements that certain

actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be achieved" or

the negative connotation thereof.

The forward-looking statements are based on certain assumptions,

which could change materially in the future, including the assumption that the Private Placement will be

completed. By their nature, forward-looking information involves known and unknown risks, uncertainties

and other factors that may cause actual results, performance or achievements to be materially different

from any future results, performance or achievements expressed or implied by the forward-looking

information. Such factors include the risk of completion of the Private Placement and uncertainties

affecting the expected use of proceeds. There can be no assurance that forward-looking information will

prove to be accurate, as actual results and future events could differ materially from those anticipated in

such statements. Accordingly, investors should not place undue reliance on forward-looking information.

Forward-looking information is provided as of the date of this press release, and the Company assumes

no obligation to update or revise them to reflect new events or circumstances, except as required in

accordance with applicable laws.

Cautionary Note to Investors

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in

policies of the TSX Venture Exchange) 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 Exécutive Officer

(208) 658-1037

To view the source version of this press release, please visit

https://www.newsfilecorp.com/release/252734