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.

The Company also holds a 100% interest in the large-scale Lundmark-Akow Lake Au-Cu property adjacent to the northwest of the Musselwhite Mine, where past drilling by the Company returned highly encouraging, broad VMS-style Au-Cu intersections. Oreterra also retains an ongoing interest in several properties including a 2% NSR on McEwen Mining's Hislop gold property in Ontario and a 2% NSR on Enduro Metals' Newmont Lake Au-Cu-Ag property in BC. Technical presentations on each of the Kinkaid, Scossa and Lundmark-Akow Lake properties, authored by J. Biczok, P.Geo, are available at https://www.oreterra.com/investors .

For further information please visit www.oreterra.com or contact:   Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release. Cautionary Statement Regarding Forward-Looking Information This news release includes certain "forward-looking statements" which are not comprised of historical facts. Forward-looking statements include estimates and statements that describe the Company's future plans, objectives or goals, including words to the effect that the Company or management expects a stated condition or result to occur.

Forward-looking statements may be identified by such terms as "believes", "anticipates", "expects", "estimates", "may", "could", "would", "will", or "plan". Since forward-looking statements are based on assumptions and address future events and conditions, by their very nature they involve inherent risks and uncertainties. Although these statements are based on information currently available to the Company, the Company provides no assurance that actual results will meet management's expectations.

Risks, uncertainties and other factors involved with forward-looking information could cause actual events, results, performance, prospects and opportunities to differ materially from those expressed or implied by such forward-looking information. Factors that could cause actual results to differ materially from such forward-looking information include, but are not limited to failure to identify mineral resources, delays in obtaining or failures to obtain required governmental, environmental or other project approvals, political risks, inability to fulfill the duty to accommodate First Nations, uncertainties relating to the availability and costs of financing needed in the future, changes in equity markets, inflation, changes in exchange rates, fluctuations in commodity prices, delays in the development of projects, capital and operating costs varying significantly from estimates and the other risks involved in the mineral exploration and development industry, and those risks set out in the Company's public documents filed on SEDAR. Although the Company believes that the assumptions and factors used in preparing the forward-looking information in this news release are reasonable, undue reliance should not be placed on such information, which only applies as of the date of this news release, and no assurance can be given that such events will occur in the disclosed time frames or at all.

The Company disclaims any intention or obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise, other than as required by law. To view the source version of this press release, please visit https://www.newsfilecorp.com/release/299329 TMX Newsfile May 29, 2026 - 4:30 AM PDT News by QuoteMedia www.quotemedia.com