Mushima North Drilling

16 October 2024

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

Mushima North Drilling

Further to its announcement of 23 September 2024, the Company is pleased to advise that the Company's inaugural drill programme at its Mushima North Copper Project in Zambia has now been completed.

Summary:

·    Drilling aimed to test the A1 and C1 coincident copper, zinc and arsenic soil anomalies defined by the Company's soil sampling programmes completed in 2023 (see announcements dated 5 October and 16 October 2023 for further details).

·    Twenty-five aircore/reverse circulation drillholes completed to a maximum depth of 112m.

·    Three drill traverses completed at anomaly A1, one drill traverse at anomaly C1.

·    Portable X-Ray Fluorescence ("pXRF) analysis of drill samples now being completed, together with QA/QC checks. Selected samples will also be sent to an independent laboratory for check analysis.

·    pXRF analytical results will be released as soon as possible.

A plan showing the location of Mushima North drill holes can be found at the end of this release.

Patrick Cheetham, Executive Chairman of Tertiary Minerals plc said:

"Our inaugural drill programme at Mushima North went smoothly and was extremely successful, meeting its objectives in full. The Mushima North area is quite remote and largely inaccessible for exploration during the wet season, so we are pleased to have completed the drill programme and demobilised the drill equipment before the onset of the rains."

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.

Notes:

1.         The information in this release has been compiled and reviewed by Mr. Patrick Cheetham (MIMMM, MAusIMM) who is a qualified person for the purposes of the AIM Note for Mining and Oil & Gas Companies. Mr. Cheetham is a Member of the Institute of Materials, Minerals & Mining and also a member of the Australasian Institute of Mining & Metallurgy.

2.         The news release may contain certain statements and expressions of belief, expectation or opinion which are forward looking statements, and which relate, inter alia, to the Company's proposed strategy, plans and objectives or to the expectations or intentions of the Company's directors. Such forward-looking statements involve known and unknown risks, uncertainties, and other important factors beyond the control of the Company that could cause the actual performance or achievements of the Company to be materially different from such forward-looking statements. Accordingly, you should not rely on any forward-looking statements and save as required by the AIM Rules for Companies or by law, the Company does not accept any obligation to disseminate any updates or revisions to such forward-looking statements.