Erdene Files Updated Resource FOR the Zuun Mod Molybdenum-Copper Project

TSX: ERD | MSE: ERDN | OTCQB: ERDCF

www.erdene.com 1 [email protected]

ERDENE FILES UPDATED RESOURCE FOR

THE ZUUN MOD MOLYBDENUM-COPPER PROJECT

Press Release

Halifax, Nova Scotia

2025.11.14

Erdene Resource Development Corp. (TSX:ERD; MSE:ERDN ; OTCQB: ERFCF)

("Erdene" or the "Company") is pleased to report that further to its announcement of

an updated mineral resource estimate for its 100% owned Zuun Mod molybdenum-copper

porphyry project, located in the Khundii Minerals District, in southwestern Mongolia, on

October 2, 2025, the Company has filed the Technical Report entitled “ Zuun Mod

Molybdenum-Copper Project, Mongolia, NI 43-101 Technical Report” with an effective

date of September 1, 2025.

Mr. Oyunbat Bat-Ochir (MAIG) of SLR Consulting Australia Pty Ltd is the Qualified Person

(QP) who prepared the updated Mineral Resource Estimate. SLR Consulting Australia

Pty Ltd is Independent of Erdene, as defined by Section 1.5 of National Instrument 43-

101 – Standards for Disclosure of Mineral Projects.

For additional information and the most current technical information, please refer to the

Technical Report available on the Erdene website (www.erdene.com) and filed on

SEDAR+ under the Company’s profile at www.sedarplus.ca.

About Erdene

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 in close proximity to 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

OTCQB Venture 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.

NO REGULATORY AUTHORITY HAS APPROVED OR DISAPPROVED THE

CONTENTS OF THIS RELEASE

Erdene Contact Information

Peter C. Akerley, President and CEO, or

Robert Jenkins, CFO

Phone: (902) 423-6419

Email: [email protected]

Twitter: https://twitter.com/ErdeneRes

Facebook: https://www.facebook.com/ErdeneResource

LinkedIn: https://www.linkedin.com/company/erdene-resource-development-corp-/