29 September 2022

Tertiary Minerals plc ("Tertiary" or "the Company")

APPOINTMENT OF EXPLORATION MANAGER, ZAMBIA

Tertiary Minerals plc is pleased to announce that it has retained the services of Richard Belcher as its Exploration Manager for Zambia.

Richard is a multi-commodity, multi-disciplined explorationist with a strong technical background and 19 years' post-PhD experience across all stages of exploration with an emphasis on gold and base metals in Africa, including in Zambia.

He has a proven capability from reconnaissance through to resource stage in challenging environments and was most recently a senior consulting geologist to Altus Strategies before its recent merger with Elemental Royalties.

Richard holds a BSc (Hons) Exploration Geology from Cardiff University (UK) and a PhD from Stellenbosch University (RSA) and is a Chartered Geologist and Fellow of the Geological Society of London.

Commenting today, Executive Chairman Patrick Cheetham said:

"This is a key appointment for the Company as we ramp up our exploration in Zambia. Richard will be leading the collaboration with major Zambian copper producer First Quantum Minerals that we announced earlier this month.

We look forward to working with Richard and with FQM and to our first joint technical meeting with FQM which is due to be held next week."

For more information please contact:

Market Abuse Regulation (MAR) Disclosure

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 which forms part of UK domestic law by virtue of the European Union (Withdrawal) Act 2018 ('MAR'). Upon the publication of this announcement via a Regulatory Information Service ('RIS'), this inside information is now considered to be in the public domain.

About Tertiary Minerals plc

Tertiary is exploring for copper and precious metals in Nevada, USA, and in Zambia through local subsidiary Tertiary Minerals (Zambia) Limited ("TMZ") which is 96% owned by Tertiary Minerals plc. TMZ has the right to acquire up to a 90% interest in five licences held by local company and licence holder Mwashia Resources Ltd, two of which are subject to a technical collaboration with First Quantum Minerals as announced on 15 September 2022 .

Further details of Tertiary's agreements with Mwashia are given in the Company's news releases of 2 August 2021 and 18 November 2021.