TYM Tertiary Minerals Plc

21 June 2024

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

DRILLING UPDATE, KONKOLA WEST COPPER PROJECT

Further to the Company's announcement of 21 May 2024, the Company is pleased to advise that the first hole at the Konkola West Copper Project, hole number KWDD001, was recently reported by KoBold Metals Company to be at a downhole depth of 1,341m and continuing in the hanging wall sequence above the target horizon.

More recently, drilling progress has been a little slower than anticipated due to use of a new drill rig and variable ground conditions. Drilling will continue until the target horizon is reached.

No further announcement will be made until this first hole is completed but planning for a second drill hole is already underway.

Further Information:

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.