Resignation of Managing Director

15 June 2022

Tertiary Minerals plc

("Tertiary" or "the Company")

Resignation of Managing Director

Tertiary Minerals plc (LON: TYM), the AIM traded mineral exploration and development company, whose strategic focus is on energy transition metals, advises that it has received and accepted a letter of resignation from its Managing Director, Mr. Patrick Cullen, effective 20 June 2022.

The Company will seek to recruit a replacement Managing Director, with Mr. Cullen's responsibilities being assumed by other members of the Board in the meantime.

Commenting today, Executive Chairman Patrick Cheetham said:

"The Board does not expect its strategy or ongoing work programmes in Zambia or Nevada to be materially affected by this change and the Board would like to thank Mr. Cullen for his contribution to the Company since joining as Managing Director in September 2021."

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Note to Editors

Tertiary Minerals plc (LON: TYM) is an AIM traded mineral exploration and development company whose strategic focus is on energy transition metals. The Company's projects are located in stable and democratic, geologically prospective, mining-friendly jurisdictions. Tertiary's current principal activities are the discovery and development of copper resources in Nevada and in Zambia.

Market Abuse Regulation

The information contained within this announcement is deemed by the Company to constitute inside information as stipulated under the Market Abuse Regulations (EU) No. 596/2014 as it forms part of UK domestic law by virtue of the European Union (Withdrawal) Act 2018 ('MAR'). Upon the publication of this announcement via Regulatory Information Service ('RIS'), this inside information is now considered to be in the public domain.