16 January 2023

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

EPB Approved for Mushima North Copper Project, Zambia

Tertiary Minerals plc is pleased to announce that its local partner and licence holder Mwashia Resources Ltd ("Mwashia") has now received approval of the Environmental Project Brief ("EPB") from the Zambian Environmental Management Agency ("ZEMA") for its Mushima North Copper Projects where the Company is earning up to a 90% interest.

The Mushima North Project, together with the Mukai Project in Zambia benefits from a data sharing and technical agreement with global copper producer First Quantum Minerals Ltd ("FQM"), details for which were announced on 15 September 2022.

Key Points:

·    ZEMA has now approved the EPB for the Mushima North Project.

·    This follows approval of EPBs for Konkola West & Lubuila Projects announced on 24 November 2022.

·    The approval process for the EPB for the Mukai Copper Project, our final outstanding EPB, is at an advanced stage.

·    EPB approval is a key approval required before field exploration programmes can proceed.

Commenting today, Executive Chairman Patrick Cheetham said:

"I am delighted to report that we have received EPB approval for the Mushima North Copper Project where we are currently working through the shared FQM data in preparation for the coming field exploration season.

On a recent visit to Zambia in December our Exploration Manager recovered sulphide mineralised drill core from a drill hole completed in the 1960's at Mushima North which reportedly tested an extensive copper-in-soil anomaly and intersected wide zones of low-grade copper mineralisation. We will be assaying this core shortly to validate this early target. I look forward to reporting back to shareholders  as soon as we have the results."

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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.