International Tower Hill Mines Ltd美股招股说明书(2026-01-22版)

SUBJECT TO COMPLETION, DATED JANUARY 22, 2026 PRELIMINARY PROSPECTUS SUPPLEMENT(To the Prospectus Dated November22, 2023) Common Shares International Tower Hill Mines Ltd. We are offering $60,000,000 of our common shares, no par value (“common shares”) pursuant to this prospectus supplement andthe accompanying prospectus (the “offering”). Our common shares are listed on the NYSE American (the “NYSE American”), under the symbol “THM,” and on the TorontoStock Exchange (the “TSX”), under the symbol “ITH”. On January21, 2026, the last reported sale price of our common shares was $2.38per common share on the NYSE American and C$3.30 per common share on the TSX. We have applied to the NYSE American and theTSX for the listing of the common shares offered hereunder, and such listing is subject to the approval of the NYSE American and the TSXin accordance with their applicable listing requirements. (1)See “Underwriting” beginning on pageS-14 for additional information regarding underwriting compensation.(2)After deducting underwriting discounts and commissions, but before deducting estimated expenses of the offering of $, which willbe paid from the proceeds of the offering. We have granted the underwriters a 30-day option to purchase up to an additional common shares from us on the same terms andconditions set forth above. We have entered into a subscription agreement with Paulson& Co. Inc. (“Paulson”), dated January21, 2026 (the “SubscriptionAgreement”) pursuant to which we intend to complete a concurrent private placement of $40 million of our common shares (the“Concurrent Private Placement”) at the public offering price of this offering. The Concurrent Private Placement is expected to closeconcurrently with this offering and we anticipate using the net proceeds of the Concurrent Private Placement for the same purposes forwhich we intend to use the net proceeds from the public offering. The consummation of the Concurrent Private Placement is contingentupon the completion of this offering, but this offering is not contingent upon the consummation of the Concurrent Private Placement. Wecannot assure you that the Concurrent Private Placement will be completed concurrently with this offering, or at all, or on the termsdescribed herein. Investing in our common shares involves a high degree of risk. Before buying any common shares, you should reviewcarefully the risks and uncertainties described under the heading “Risk Factors” beginning on pageS-7 of this prospectussupplement, page1 of the accompanying prospectus, and in the documents incorporated by reference into this prospectussupplement and the accompanying prospectus. NEITHERTHE SECURITIES AND EXCHANGE COMMISSION(“SEC”)NOR ANY STATE SECURITIESCOMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS PROSPECTUSSUPPLEMENT OR THE ACCOMPANYING PROSPECTUS TO WHICH IT RELATES IS TRUTHFUL OR COMPLETE. ANYREPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE. The underwriters expect to deliver the common shares on or about January, 2026 (the “Closing Date”). Lead Bookrunning Manager BMO Capital Markets Prospectus Supplement dated January, 2026 TABLE OF CONTENTS Prospectus Supplement ABOUT THIS PROSPECTUS SUPPLEMENTWHERE YOU CAN FIND MORE INFORMATIONINFORMATION INCORPORATED BY REFERENCECAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTSSUMMARYTHE OFFERINGRISK FACTORSCAPITALIZATIONDILUTIONUSE OF PROCEEDSUNDERWRITINGCONCURRENT PRIVATE PLACEMENTMATERIAL UNITED STATES FEDERAL INCOME TAX CONSEQUENCES PROSPECTUS About This ProspectusWhere You Can Find More InformationInformation Incorporated By ReferenceCautionary Statement Regarding Forward-Looking StatementsRisk FactorsAbout International Tower Hill Mines Ltd.Use of ProceedsDilutionDescription of SecuritiesDenominations, Registration and TransferCertain Income Tax ConsiderationsPlan of DistributionLegal MattersExperts We expect that delivery of the common shares will be made against payment therefor on or about the Closing Date specified onthe cover pageof this prospectus supplement, which will be thebusiness day following the date of this prospectus supplement. Thissettlement cycle is referred to as “T+.” Under Rule15c6-1 under the Securities Exchange Act of 1934, as amended (the “ExchangeAct”), trades in the secondary market generally are required to settle in one business day, unless the parties to any such trade expresslyagree otherwise. Accordingly, purchasers who wish to trade common shares prior to the Closing Date may be required, by virtue of the factthat the common shares initially will settle T+, to specify an alternate settlement cycle at the time of any such trade to prevent a failedsettlement. Purchasers of common shares who wish to trade common shares prior to the Closing Date should consult their own advisors. ABOUT THIS PROSPECTUS SUPPLEMENT This prospectus supplement is a part of a registration statement on FormS-3 (File No.333-273881) that we filed with the SEC on