Osiris One Metals Closes Acquisition of 80% Interest and Announces Filing of Technical Reports on "Western Range" Silver Copper Project in Western Australia

About this update from Osiris One Metals Ltd.

Vancouver, British Columbia--(Newsfile Corp. - June 25, 2026) - Osiris One Metals Ltd (TSXV: OSM) (FSE: JI8) (" Osiris One " or the " Company ") is pleased to announce that it has closed its previously announced acquisition (the " Transaction ") from Standard American Metals LLC of an 80% interest in the Western Range Silver Copper Project (" Western Range ") in Western Australia. Additionally, the Company has filed a technical report on Western Range. Comprising over 19,000 hectares in a proven mining region near the Abra Mine, one of Australia's major silver lead operations, Western Range provides Osiris One with a defined pipeline of priority exploration targets, supported by historical geophysical work and limited modern follow up. Western Range was originally targeted by BHP and Rio Tinto during 1990s exploration and benefits from a large historical dataset covering magnetics, gravity and electromagnetic surveys. Despite this major company groundwork, several named targets, including Edge 12A, BGA005 and Collie 42, remain largely untested, as both companies shifted away from exploration work in Australia. Sreenath Didugu, Chief Executive Officer of Osiris One, commented: "With clear avenues for value creation, several defined and underexplored targets, and a significant geological record in a well understood mining region, the Western Range acquisition builds on the corporate restructuring conducted by management and marks Osiris One's entrance into its next phase of growth. "We are excited to advance this project, starting with modern verification of historic targets and moving toward a concise confirmation program." The Company is pleased to announce that it has filed a National Instrument 43-101 - Standards of Disclosure for Mineral Projects (" NI 43-101 ") compliant technical report on the Western Range project, titled "NI 43-101 Technical Report on the Western Range Project Western Australia" (the " NI 43-101 Report ") by Indeport Pty Ltd dated effective June 22, 2026. The full NI 43-101 Report on Western Range can be found under the Company's profile on SEDAR+ ( www.sedarplus.ca ), and on the Company's website ( www.osirisonemetals.com ). Transaction Summary Pursuant to the Transaction agreement, the total consideration consisted of US$30,000 in cash, 9,000,000 shares (the " Consideration Shares "), and a free carry to Bankable Feasibility Study. In exchange, Osiris One acquires an 80% interest in the tenements. The Consideration Shares have been issued subject to a statutory four month hold period under applicable Canadian securities laws and will also be subject to additional voluntary resale restrictions such that 1/3 of the Consideration Shares may not be transferred or resold until 4 months after the Closing date, 1/3 may not be transferred or resold until 8 months after the Closing date, and 1/3 may not be transferred or resold until 12 months after the Closing date. The Transaction was an arm's length transaction. No finder's fees were paid in connection with the Transaction.

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