Thunder Mountain Gold Launches Phase II Field Exploration at South Mountain Project, Idaho Program includes deep-sensing Magnetotelluric (MT) survey and geophysical work led by a renowned exploration team Key elements of Phase II exploration include:
Thunder Mountain Gold Launches Phase II
Field Exploration at South Mountain Project,
Idaho
Program includes deep-sensing Magnetotelluric (MT) survey
and geophysical work led by a renowned exploration team
Key elements of Phase II exploration include:
Magnetotelluric (MT) geophysics
to investigate potential deep-seated porphyry centers.
Extension and refinement of IP geophysical surveys
across key zones of the project.
Porphyry-focused mapping and sampling
programs to validate and extend historical
geochemical anomalies.
Structural geological studies
to refine drill targeting, improve geological models, and identify
the structural controls of the mineralized system.
Boise, Idaho--(Newsfile Corp. - August 6, 2025) -
Thunder Mountain Gold Inc. (OTCQB: THMG)
(TSXV: THM) ("Thunder Mountain" or the "Company")
is pleased to announce the commencement
of Phase II field exploration at its South Mountain Project in Owyhee County, Idaho. This advanced
exploration campaign marks a significant step in targeting deeper porphyry systems and expanding the
footprint of the known Carbonate Replacement Deposits (CRD)/skarn mineralization.
Building on the success of earlier fieldwork, the Phase II program integrates deep-penetrating
geophysical tools and the expertise of a multidisciplinary team. Central to this phase is a state-of-the-art
Magnetotelluric (MT) survey, designed to image conductive anomalies at depth that may reflect porphyry
copper-molybdenum systems beneath the known high-grade zones.
Figure 1. Location of South Mountain Project
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Exploration Technical Team:
The Phase II geophysical program is being directed by a well known multi-disciplinary technical team
with decades of exploration success and multiple discoveries to their credit:
John Reynolds - Durango Geophysical Operations:
Leading the acquisition and
interpretation of IP and MT datasets. John is credited with the geophysical discoveries of the
Las
Colinas/Los Planes
gold deposit in Baja California Mexico and the
Boa Esperança
copper-
cobalt deposit in the Tucuma region of Para, Brazil.
John led early geophysical programs at South
Mountain with Dr. Phil Hallof —considered the father of modern induced polarization and member
of the Canadian Mining Hall of Fame.
Rich Leveille - Consulting Exploration Geologist:
Overseeing porphyry copper-molybdenum
mapping and sampling. Rich's career includes discovery leadership roles at
Penasquito
(Kennecott),
Sossego-Sequeirinho
(Phelps Dodge), and most recently, as
Senior VP
Exploration at Freeport-McMoRan
. His work has contributed to global copper reserves and
earned him the
PDAC Thayer Lindsley International Discovery Award
.
Dr. Stephen J. Reynolds - Arizona State University (Emeritus):
Guiding structural geology
and regional interpretation. Dr. Reynolds is recognized for redefining gold system models in
southern Baja California and has led exploration initiatives for porphyry and precious metal
systems across the western U.S. and Mexico.
Dale Moore - Tamarack Geological Services:
Providing 3D geological, geochemical, and
geophysical modeling using Leapfrog. Dale was instrumental in the
Galena GIP exploration
program
, which greatly added to the silver resource base of Americas Gold and Silver.
Karen Christopherson - Chinook Geoconsulting:
Interpreting MT geophysical data with
advanced 2D/3D modeling techniques. Karen's work is key to locating deep porphyry centers
beneath the current South Mountain mineralization.
"The launch of Phase II reflects our commitment to unlocking the full scale of the South Mountain system,"
commented
Eric T. Jones
, President & CEO of Thunder Mountain. "With John Reynolds and our
extended technical team, we're executing the most comprehensive and technically advanced exploration
campaigns in the Company's history. These efforts will significantly enhance our understanding of the
deeper copper-molybdenum porphyry potential while advancing South Mountain as one of the more
compelling high-grade CRD systems in North America."
Next Steps:
The MT and IP surveys will be conducted through late summer, while interpretation and 3D modeling will
follow in Q4 2025. Drill target prioritization is underway for a potential late-year 2025 or early 2026
program. All activities are being completed in alignment with Thunder Mountain's permitting framework
on private land, ensuring an efficient path toward project development.
Qualified Person(s) Statement for the Technical Data in this Release
The technical information in this news release was reviewed and approved by Tyson Forbush, C.P.G.,
consulting geologist with GeoTech LLC, and a "Qualified Person" as defined by the U.S. SK-1300
regulations & National Instrument 43-101 (Canada) standards.
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 (See
Figure 1 above). 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 developmental 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 on the Thunder Mountain
Gold Inc. website and at
www.SEC.gov
, and
www.sedarplus.ca
).
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 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 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
.
OTHER COMPANY NEWS:
The Company has reserved Wednesday, December 3, 2025, for its annual shareholder meeting. Further
details will be distributed to shareholders in the upcoming Proxy Statement.
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. 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. 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. Investors should
refer to THMG's Form 10-K, Form 10-Q reports, for a more detailed discussion of risks that may impact
future results. 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
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 (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 Executive Officer
Office: (208) 658-1037
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