International Tower Hill Mines Provides Progress Report on Antimony Metallurgy Study at the Livengood Gold Project
200 Burrard Street
Suite 1570
Vancouver, BC Canada
V6C 3L6
Tel: 604.683.6332
Fax: 604.408.7499
www.ithmines.com
NR25-06 September 4, 2025
International Tower Hill Mines Provides Progress Report on
Antimony Metallurgy Study at the Livengood Gold Project
Vancouver, British Columbia, September 4, 2025 – Intern ational Tower Hill Mines Ltd. (the “Company”) -
(TSX: ITH) (NYSE American: THM) today announced that it has received encouraging results from the first
phase of the metallurgical study on antimony mineralization at the Livengood Gold Project that was announced
on March 4, 2025.
The Company’s most recent S-K 1300 Technical Report Summary, “Pre-Feasibility Study of the Livengood
Gold Project”, as amended October 13, 2023, presented a new geologic model for the Livengood deposit and
detailed gold metallurgical work that allowed th e relationship between gol d recovery and antimony
mineralization to be characterized. During this geological modelling process, 54 veins of massive stibnite were
detailed as presented in Table 11-8 “Livengood deposit ma ssive stibnite grade estimates” of the S-K 1300
Technical Report Summary. While the pre-feasibility study detailed the 9.0 million ounce proven and probable
gold reserve contained within the 13.6 million ounce m easured and indicated gold resource, with 6.4 million
ounces of gold production projected over 21 years, no meta llurgical studies had been completed at that time
to provide an understanding of whether antimony might be recoverable from the massive stibnite veins.
Subsequent to the announcement on March 4, 2025, th e Company compiled four metallurgical composites,
each from individual veins, and provided splits from the composites to Advanced Mineral Technology
Laboratory Ltd., London, Ontario (AMTEL) for an timony deportment work. The gold and antimony assays
for these samples are presented in Table 1 below.
Table 1. Livengood Gold Project Vein Composite Assays
Sample Au g/mt Sb%
SB12 4.19 2.75
SB24 3.72 2.31
SB40 3.31 1.41
SB46 3.21 1.05
The samples were milled to p80 of 250 micron (the same grind size as selected in the 2023 Technical Report
Summary for the 9.0 million ounce proven and probable gold reserve based on optimization studies). The
milled material was separated by size and mineralogy and then examined. Results for all samples indicate that
the antimony is carried by stibnite, that most of the stibnite is of a floatable size (>10 micron), that the
liberation of stibnite is very good at the grind size of p80 250 micron, and thus the samples have the potential
to respond well to flotation.
These results warrant continuation into the next phase of the test work to assess potential flowsheets, to
evaluate how the samples respond to flotation, and to determine what the character istics of any concentrate
obtained might be. The Company intends to commence this work immediately at SGS Vancouver and SGS
Lakefield. The data presented here is very preliminary in nature and simply indicates a further examination of
the metallurgy of the antimony carried by the stibnite veins is warranted. Much more metallurgical and
extensive other work would be required before any determination of the recoverability of the antimony could
be established, as well as before any economic analysis or estimates of tonnage, grade or resource could be
developed.
International Tower Hill Mines Ltd. - 2 - September 4, 2025
NR25-06 Continued
Forward-Looking Statements
Statements in this press release that are not statements of historical or current fact constitute “forward-looking
statements” within the meaning of the U.S. Private Securities Litigation Reform Act of 1995, as amended,
Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of
1934, as amended, and “forward-looking information” w ithin the meaning of applicable Canadian securities
laws (collectively, “forward-looking statements”). Such forward-looking statements involve known and
unknown risks, uncertainties, and other factors that could cause the actual results of the Company to be
materially different from historical results or from an y future results expressed or implied by such forward-
looking statements. In addition to statements which explicitly describe such risks and uncertainties, readers are
urged to consider statements containing the terms “i ntends,” “estimates,” “may,” “might”, “will,” or other
similar expressions to be uncertain and forward-looking. Readers are cautioned not to place undue reliance on
these forward-looking statements, which speak only as of the date of this press release. The forward-looking
statements in this press release, including statements regarding estimates of the quality and quantity of the
mineral resources at the Livengood Gold Project, including gold and antimony, and the potential for production
at the Livengood Gold Project are based upon the Comp any’s current expectations and involve assumptions
that may never materialize or may prove to be incorrect . Actual results and the timing of events could differ
materially from those anticipated in such forward-looking statements as a result of various risks and
uncertainties, including, without limitation: (i) the dema nd for, and level and volatility of the price of, gold,
(ii) general business and economic conditions, (iii) the accuracy of the Company’s resource estimates
(including with respect to size and grade) and the geological, operational and price assumptions on which these
are based, (iv) the timing of the Company’s ability to commence and complete planned work programs at the
Livengood Gold Project, including the antimony study, (v) the Company’s ability to attract and retain key staff,
particularly in connection with th e permitting and development of any mi ne at the Livengood Gold Project,
and (vi) the Company’s ability to secure the necessary services and supplies on favorable terms in connection
with its programs at the Livengood Gold Project and ot her activities. The foregoing list of important factors
that could cause actual events to differ from expectations should not be construed as exhaustive and should be
read in conjunction with statements that are included herein and elsewhere, including the risk factors detailed
in the “Forward-Looking Statements,” “Risk Factor s” and “Management's Discussion and Analysis of
Financial Condition and Results of Operations” sections of the Company's Annual Report on Form 10-K for
the fiscal year ended December 31, 2024, Quarterly Report on Form 10-Q for the quarterly period ended March
31, 2025 and the Quarterly Report on Form 10-Q for th e quarterly period ended June 30, 2025 and other
documents that have been and will be filed by the Company from time to time with the Securities and Exchange
Commission and Canadian securities regulators. All forward-looking statements contained in this press release
speak only as of the date on which they were made . The Company undertakes no obligation to update such
statements to reflect events that occur or circumstances that exist afte r the date on which they were made,
except as required by applicable securities laws.
About International Tower Hill Mines Ltd.
International Tower Hill Mines Ltd. has a 100% interest in its Livengood Gold Project located along the paved
Elliott Highway, 70 miles north of Fairbanks, Alaska.
On behalf of
International Tower Hill Mines Ltd.
(signed) Karl L. Hanneman
Chief Executive Officer
Contact Information: Richard Solie, Jr., Manager - Investor Relations
E-mail: [email protected]
Direct line: 907-328-2825 Toll-Free: 1-855-428-2825