Oreterra receives conditional approval to sell option on Newmont Lake royalty to Enduro Metals

Toronto, Ontario--(Newsfile Corp. - May 29, 2026) - Oreterra Metals Corp. (TSXV: OTMC) (OTCID: OTMCF) (FSE: D4RO) (WKN: A421RQ)  (" Oreterra " or the " Company ") is pleased to announce that the TSX Venture Exchange has conditionally accepted for filing documentation pertaining to an arms-length amending agreement dated April 27, 2026 (the "Agreement"), between the Company and an arm's length party: Enduro Metals Corporation (the "Optionee"), a TSXV Listed Issuer. Pursuant to the Agreement, the Optionee will have an option to acquire up to 50% of the net smelter returns royalty interest held by the Company in the Optionee's Newmont Lake Project (the "NSR"), located adjacent to Oreterra's Trek-Andrei property in BC's Golden Triangle. Closing of the transaction remains subject to TSX Venture Exchange final approval.

About the Agreement: In order to exercise the option on the NSR, the Optionee must issue 3,900,000 common shares to the Company and make aggregate payments of $550,000 to the Company over a period of two years (the "Term"), of which $175,000 is due within 3 months of closing, and payments of $250,000 may be payable in cash or common shares of the Optionee during the Term (at the Optionee's discretion). Further, potential future consideration involves: (i) a $500,000 cash payment upon delivery of a maiden NI 43-101 compliant resource estimate (of which up to $300,000 may be satisfied through the issuance of common shares of the Optionee); (ii) a $1,750,000 cash payment and a $1,750,000 advance royalty payment upon completion of the first Feasibility Study in respect of the Property; (iii) a $10,000,000 cash advance royalty payment upon a decision to proceed toward mine permitting; and (iv) a one-time payment of $8,000,000 prior to commencement of extraction to buy back 50% of the existing 2% NSR. Upon exercise of the option, the Company will retain a 1.0% Net Smelter Return royalty on the Property.

About Oreterra Metals Corp. Oreterra Metals Corp. is a TSXV-listed mineral exploration company focused primarily on copper, gold and silver. The Company holds several wholly-owned porphyry copper-gold prospects in British Columbia's Golden Triangle, the most significant of which is the newly-identified Trek South prospect located to the southeast of Teck-Newmont's Galore Creek project, currently undergoing pre-feasibility studies. Following a highly successful $9.7 million financing closed in March, a maiden two-phase, approximately 10,000 metre drill program at Trek South is now fully funded, for completion this summer.

Drilling will test a 1.6 km wide zone of intense porphyry-style alteration, mineralization and underlying coincident strong IP, MT and magnetic anomalies exposed by recent glacial retreat. In addition, the first significant exploration work since 2007 is now planned for Oreterra's JW porphyry prospect, located to the northwest of the Galore Creek deposits. Additional wholly-owned interests include two former producers in Nevada: the Kinkaid claims in the Walker Lane trend covering numerous shallow Au-Cu-Ag workings over what is believed to be one or more porphyry centres, and the Scossa mine property in the Sleeper trend which is a former high-grade gold producer.