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ITH.TO ·

International Tower Hill Mines Announces Appointment of Gold Market Expert Dr. Edel Tully to Board

Management Changes

200 Granville Street

Suite 2710

Vancouver, BC

Canada V6C 1S4

Tel: 604.683.6332

Fax: 604.408.7499

www.ithmines.com

NR23-04 June 22, 2023

International Tower Hill Mines Announces Appointment of

Gold Market Expert Dr. Edel Tully to Board

Vancouver, British Columbia, June 22, 2023 – International Tower Hill Mines Ltd. (the “Company”) - (TSX:

ITH) (NYSE American: THM) announces the appointment of gold market expert Dr. Edel Tully to the

Company’s board of directors, effective June 18, 2023, expanding the board from six to seven members.

“On behalf of the Board of Directors, I am pleased to welcome Dr. Tully. Her d eep and vast experience

in understanding the gold market will help the Co mpany maximize its tremendous leverage to high er gold

prices,” said Marcelo Kim, Board Chair.

Dr. Tully is a business leader with 20 years of experience in the precious metals ma rket. She is currently the

Head of Communications and Financial Markets Development Lead at the London Bullion Market Association

(LBMA). Edel spent 10 years at UBS where she was mo st recently Global Head Precious Metal Sales and

Managing Director and prior to this Head of Precious Metals Research. Before UBS, Edel was Head of

Precious Metals Research at Mitsui and Co. Precious Metals, Inc. Dr. Tully has been a frequent conference

speaker and media guest and is highly respected as a precious metals industry expert.

“I am excited to join International Tower Hill Mines’ board of directors and look forward to contributing

my precious metals sector experience to this very exciting company,” said Dr. Tully.

About International Tower Hill Mines Ltd.

International Tower Hill Mines Ltd. controls 100% of the Livengood Gold Project located along the paved

Elliott Highway, 70 miles north of Fairbanks, Alaska. As of December 31, 2022, the Livengood Gold Project

has a measured and indicated mineral resource of 704. 5 million tonnes at an average grade of 0.60 g/tonne

(13.62 million ounces). As reported in the Technical Report Summary filed as Exhibit 96.1 to the Annual

Report on Form 10-K for the year ended December 31, 202 2 (TRS), a portion of the mineral resources at the

Project have been converted into proven and probable reserves of 430.1 million tonnes at an average grade of

0.65 g/tonne (9.0 million ounces) based on a gold price of $1,680 per ounce. The TRS has estimated the capital

costs of the Project at $1.93 billion, the total cost per ton milled at $13.12, the all-in sustaining costs at $1,171

per ounce, and net present value (5%) at $1,800/oz of $400 million and $975 million at $2,000/oz.

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

International Tower Hill Mines Ltd. - 2 - June 22, 2023

NR23-04 Continued

Cautionary Note Regarding Forward-Looking Statements

This press release contains forward-looking statements and forward-looking information (collectively, “forward-looking

statements”) within the meaning of applicable Canadian and US securities legislation. All statements, other than

statements of historical fact, included herein, including statements with respect to the mine plan, economic analysis

(including capital expenditures, operating expenditures, a ll-in-sustaining costs and all-in costs) and production and

design details described in the TRS; the potential to convert mineral resources to mineral reserves; the ability of the

Company to advance the Livengood Project either as projected or at all are forward-looking statements. Information

concerning mineral reserve/resource estimates and the economic analysis thereof contained in the TRS also may be

deemed to be forward-looking statements in that it reflects a prediction of the mineralization that would be encountered,

and the results of mining it, if a mineral deposit were deve loped and mined. Although th e Company believes that such

statements are reasonable, it can give no assurance that such expectations will prove to be correct. Forward-looking

statements are typically identified by words such as: believe, expect, anticipate, intend, es timate, postulate, proposed,

planned, potential and similar expressions, or are those, whic h, by their nature, refer to future events. The Company

cautions investors that any forward-looking statements by the Company are not guarantees of future results or

performance, and that actual results may differ materially from those in forward looking statements as a result of various

factors, including, but not limited to, th e demand for, and level and volatility of the price of gold; conditions in the

financial markets generally, the overall sentiment of the markets for public equity, interest rates, currency rates, and the

rate of inflation; general business and economic conditions; government regulation and proposed legislation (and

changes thereto or interpretations thereof); defects in title to claims or the ability to obtain surface rights, either of which

could affect the Company’s property ri ghts and claims; the Comp any’s ability to secure th e necessary services and

supplies on favorable terms in connection with its programs at the Livengood Gold Project and other activities; the

Company’s ability to attract and retain key staff, particularly in connection with the permitting and development of any

mine at the Livengood Gold Project; 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; the timing of the Company’s

ability to commence and complete planned work programs at the Livengood Gold Project; the timing of the receipt of

and the terms of the consents, permits and authorizations necessary to carry out exploration and development programs

at the Livengood Gold Project and the Company’s ability to comply with such terms on a safe and cost-effective basis;

the ongoing relations of the Company with the lessors of its property interests and applicable regulatory agencies; the

metallurgy and recovery characteristics of samples from certain of the Company’s mineral properties and whether such

characteristics are reflective of the deposit as a whole; the continued development of and potential construction of any

mine at the Livengood Gold Project property not requiring consents, approvals, authorizations or permits that are

materially different from those identified by the Company; and other risks and uncertainties disclosed in the Company’s

Annual Information Form filed with certain securities commissions in Canada and the Company’s Annual Report on

Form 10-K filed with the United States Securities and Exchange Commission (the “SEC”), and other information released

by the Company and filed with the appropriate regulatory agencies. All of the Company’s Canadian public disclosure

filings may be accessed via www.sedar.com and its United St ates public disclosure filings may be accessed via

www.sec.gov, and readers are urged to review these materials, including the TRS filed as Exhibit 96.1 to the Company's

Annual Report on Form 10-K for the year ended December 31, 2022.

Non-IFRS Measures

The Company has included certain non-IFRS measures in this news release, as discussed below. The Company believes

that these measures, in addition to conventional measures prepared in accordance with IFRS, provides investors with an

improved ability to evaluate the underlying performance of the Company. These non-IFRS measures are intended to

provide additional information and should not be considered in isolation or as a substitute for measures of performance

prepared in accordance with IFRS. These measures do not have any standardized meaning prescribed under IFRS, and

therefore may not be comparable to other issuers.

All-In Sustaining Costs (“AISC”) and AISC/oz

AISC is a performance measure that reflects the expenditures that are required to produce an ounce of gold from current

operations. While there is no standardized meaning of the measure across the industry, the Company’s definition is

derived from the definition, as set out by the World Gold Council in its guidance dated June 27, 2013 and November 16,

2018, respectively. The World Gold Council is a non-regulatory, non-profit organization established in 1987 whose

members include global senior mining companies. The Company believes that this measure is useful to external users in

International Tower Hill Mines Ltd. - 3 - June 22, 2023

NR23-04 Continued

assessing operating performance and the ability to generate free cash flow from operations. The Company defines AISC

as the sum of total cash costs, sustaining capital (capital required to maintain current operations at existing production

levels), capital lease repayments, exploration expenditures designed to increase resource confidence at producing mines,

amortization of asset retirement costs and rehabilitation accretion related to current operations. AISC excludes general

corporate and administrative costs incurred at the non-project level, capital expenditures for significant improvements

at existing operations deemed to be expansionary in nature, exploration and evaluation related to resource growth,

rehabilitation accretion not related to current operations, finan cing costs, debt repayments, and taxes. Total AISC is

divided by gold ounces sold to arrive at a per ounce figure.

All-In Costs (“AIC”) and All-In-Costs/oz

The Company defines AIC as the sum of AISC costs plus initial capital expenditures. Total AIC is divided by gold ounces

sold to arrive at a per ounce figure.

Cautionary Note Regarding References to Resources and Reserves

National Instrument 43-101 - St andards of Disclosure for Mi neral Projects (“NI 43-101”) is a rule developed by the

Canadian Securities Administrators which establishes standards for all public disclosure an issuer makes of scientific

and technical information concerning mineral projects. Unless otherwise indicated, all resource and reserve estimates

contained in or incorporated by reference in this news release have been prepared in accordance with NI 43-101 and the

guidelines set out in the Canadian Institute of Mining, Metallurgy and Petroleum (the “CIM”) Standards on Mineral

Resource and Mineral Reserves, adopted by the CIM Council on May 10, 2014 (the “CIM Standards”) as they may be

amended from time to time by the CIM.

Accordingly, information in this press release providing de scriptions of the Company’s mineral deposits in accordance

with NI 43-101 may not be comparable to similar information made public by other U.S. companies subject to the United

States federal securities laws and the rules and regulations thereunder.

Pursuant to CIM Definition Standards, "Inferred mineral resources" are that part of a mineral resource for which quantity

and grade or quality are estimated on the basis of limited geological evidence and sampling. Such geological evidence is

sufficient to imply but not verify geological and grade or quality continuity. An inferred mineral resource has a lower

level of confidence than that applying to an indicated mineral resource and must not be converted to a mineral reserve.

However, it is reasonably expected that the majority of inferred mineral resources could be upgraded to indicated mineral

resources with continued exploration. Under Canadian rules, estimates of inferred mineral resources may not form the

basis of feasibility or pre-feasibility studi es, except in rare cases. In vestors are cautioned not to assume that all or any

part of an inferred mineral resource is economically or legally mineable.

Effective February 25, 2019, the SEC adopted new mining disclosure rules under subpart 1300 of Regulation S-K of the

United States Securities Act of 1933, as amended (the "SEC Modernization Rules"), with compliance required for the first

fiscal year beginning on or after January 1, 2021. The SEC Modernization Rules replace the historical property disclosure

requirements included in SEC Industry Guide 7. As a result of the adoption of the SEC Modernization Rules, the SEC

now recognizes estimates of "Measured Mineral Resources", "Indicated Mineral Resources" and "Inferred Mineral

Resources". In addition, the SEC has amended its definiti ons of "Proven Mineral Reserves" and "Probable Mineral

Reserves" to be substantially similar to corresponding definitions under the CIM Definition Standards. While the SEC

Modernization Rules are purported to be "substantially similar" to the CIM Definition Standards, readers are cautioned

that there are differences between the SEC Modernization Rules and the CIM Definitions Standards. Accordingly, there

is no assurance any mineral reserves or mineral resources that the Company may report as "proven mineral reserves",

"probable mineral reserves", "measured mineral resource s", "indicated mineral resources" and "inferred mineral

resources" under NI 43-101 would be the same had the Company prepared the reserve or resource estimates under the

standards adopted under the SEC Modernization Rules.

This news release is not, and is not to be construed in any way as, an offer to buy or sell securities in the United States.