Mr. Peter Akerley reports

ERDENE FILES UPDATED RESOURCE FOR THE ZUUN MOD MOLYBDENUM-COPPER PROJECT

Further to its announcement of an updated mineral resource estimate for Erdene Resource Development Corp.'s 100-per-cent-owned Zuun Mod molybdenum-copper porphyry project, located in the Khundii minerals district, in southwestern Mongolia, on Oct. 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 Sept. 1, 2025.

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 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 and filed on SEDAR+ under the company's profile.

About Erdene Resource Development Corp.

Erdene Resource Development 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 is listed on the Toronto (ERD) and the Mongolian stock (ERDN) exchanges and OTCQB Venture Market (ERDCF).