Erdene Announces 2025 Results – Provides Bayan Khundii Gold Mine and Exploration Update

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Khundii Minerals District Exploration & Development

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  • Prepared updated independent mineral resource estimate for Zuun Mod in October
    • 22% increase in Measured and Indicated molybdenum (“Mo”) resources to 333 million pounds (“Mlbs”) and 90% increase in Inferred Mo resources to 300 Mlbs
    • 16% increase in Measured and Indicated copper (“Cu”) resources to 384 Mlbs and 75% increase in Inferred Cu resources to 350 Mlbs
    • Preliminary Economic Assessment planned for completion in mid-2026
  • Completed 3,362 meter, 24-hole drill program on the Khuvyn Khar license in late 2025
    • Eighteen holes testing the upper 150 metres of the Zuun Mod deposit confirmed and, in some cases, expanded continuity in the mineral resource
    • Intersected 30 metres of 1.25% Cu at the Khuvyn Khar copper-silver prospect, 4 kms from ZM molybdenum deposit

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Corporate

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  • Entered option agreement to acquire up to 80% of the Tereg Uul Copper-Gold porphyry prospect
    • License is located ~10km southwest along trend of the Oyu Tolgoi copper-gold deposit
    • Prospecting has identified gold and copper targets for drill testing in 2026
  • Completed 6:1 consolidation of common shares on September 2, 2025
    • Reduced the number of outstanding Common Shares from 366,351,958 to 61,063,549
  • Closed a bought deal private placement for gross proceeds of $28,747,000 in February 2026
    • Issued 3,230,000 common shares at a price of $8.90 per common share
  • Recorded net loss of $8,181,842 for the year ended December 31, 2025, compared to net loss of $8,245,886 for the year ended December 31, 2024
    • Exploration and evaluation expenses totaled $2,448,232 for the year ended December 31, 2025, compared to $1,852,642 for the year ended December 31, 2024, with the year over year increase primarily due to expenditures associated with the Tereg Uul property optioned in July 2025 and increased efforts on new project evaluation
    • Corporate and administrative expenses totaled $3,997,960 for the year ended December 31, 2025, compared to $5,043,058 for the year ended December 31, 2024, with the year-on-year reduction primarily due to one time costs associated with project finance and the close of the Strategic Alliance in the prior year, partially offset by cost of living adjustments in the current year
    • Loss from investment in associate, representing the Company’s joint venture interest in the loss of EM, totaled $1,917,471 for the year ended December 31, 2025, compared to $3,245,109 for the year ended December 31, 2024 as the net proceeds from gold sales in Q3 and Q4 2025, partially offset increased interest expenditures following the completion of construction of BK

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Results Conference Call

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Management will host a webcast and conference call to discuss these results and current business initiatives on Wednesday, March 25, 2026, at 9:00 AM Eastern Time. The webcast will be accessible at the following link: HERE

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A replay of the webcast will be available at the same link for one year after the event.

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The dial-in numbers for the conference call are as follows:

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  • North America (toll free): 1-800-717-1738
  • Overseas or local (Toronto): 1-289-514-5100

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Qualified Person

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Jon Lyons, FAusIMM, Chief Development Officer for Erdene, is the Qualified Person as that term is defined in National Instrument 43-101 and oversees the Bayan Khundii Mine operations for the Corporation and has reviewed and approved the technical information related to the BK Mine contained in this news release.

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Peter Dalton, P.Geo. (Nova Scotia), Senior Geologist for Erdene, is the Qualified Person as that term is defined in National Instrument 43-101 and oversees the Corporation’s exploration programs and has reviewed and approved the technical information related to exploration contained in this news release.

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About Erdene

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Erdene Resource Development Corp. is a Canada-based resource company producing gold at the high-grade, low-cost Bayan Khundii Gold Mine in underexplored and highly prospective Mongolia. The Company has interests in a portfolio of precious and base metal projects near the Bayan Khundii Gold Mine in the Khundii Minerals District, which provides a robust organic growth pipeline. Erdene Resource Development Corp. is listed on the Toronto (“ERD”) and the Mongolian stock (“ERDN”) exchanges and OTCQX Market (“ERDCF”). Further information is available at www.erdene.com. Important information may be disseminated exclusively via the website; investors should consult the site to access this information.

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Forward-Looking Statements

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Certain information regarding Erdene contained herein may constitute forward-looking statements within the meaning of applicable securities laws. Forward-looking statements may include estimates, plans, expectations, opinions, forecasts, projections, guidance, or other statements that are not statements of fact. Although Erdene believes that the expectations reflected in such forward-looking statements are reasonable, it can give no assurance that such expectations will prove to have been correct. Erdene cautions that actual performance will be affected by a number of factors, most of which are beyond its control, and that future events and results may vary substantially from what Erdene currently foresees. Factors that could cause actual results to differ materially from those in forward-looking statements include the ability to obtain required third party approvals, market prices, exploitation, and exploration results, continued availability of capital and financing and general economic, market or business conditions. The forward-looking statements are expressly qualified in their entirety by this cautionary statement. The information contained herein is stated as of the current date and is subject to change after that date. The Company does not assume the obligation to revise or update these forward-looking statements, except as may be required under applicable securities laws.

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NO REGULATORY AUTHORITY HAS APPROVED OR DISAPPROVED THE CONTENTS OF THIS RELEASE

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Erdene Contact Information

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Peter C. Akerley, President and CEO, or
Robert Jenkins, CFO

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