Following the recent release of soil sampling results from the C1 target area at its Mushima North Copper Project in Zambia, Tertiary Minerals plc reported further positive portable X-Ray fluorescence ("pXRF") analytical results from targets A1 and A2. Key Points: Areas A1 & A2 are targets for traditional Copperbelt sediment-hosted mineralisation where known deposits in Zambia and the DRC range in size up to supergiant size (>25mt contained copper). 248 soil samples were initially collected on a 200m x 200m spaced grid at the A1 and A2 targets.

A further 311 samples were taken as an infill of the A1 grid at 100m x100m spacing and at 50m spacing along three east-west lines. pXRF analytical results at target A1 have outlined a significant open-ended copper anomaly with soil samples above 80ppm covering an area of 3 km long by up to 1.5 km wide, peaking at 280ppm copper. A high-grade area within the A1 copper-in-soil anomaly with values above 200ppm and averaging 231ppm copper has dimensions of 400m x 150m.

pXRF results at target A2 show very high copper values, up to 1,239ppm copper in organic-rich samples from the perimeter of a marsh (dambo). The copper in this hydromorphic anomaly is likely transported and may be linked to the source of the A1 copper-in-soil anomaly. A new copper prospect was discovered during field evaluation of a historic electromagnetic target to the west of target A1.

Values up to 0.43% (4,300ppm) copper were returned from average pXRF analysis of surface rocks showing visible oxide copper mineralisation. The Mushima North Copper Project comprises Exploration Licence 27068-HQ-LEL. It covers 701 km2 and is located in Zambia's Northwest Province.

Tertiary Minerals plc's 96% owned subsidiary, Tertiary Minerals (Zambia) Limited, is currently earning up to a 90% interest in the Project from local partner Mwashia Resources Limited. Mushima North is one of five projects in Zambia where Tertiary is exploring for copper and one of two projects which benefit from the Company's technical cooperation and data sharing agreement with leading copper producer First Quantum Minerals. The Project lies 20 km to the east of the Kalengwa copper mine (past production 4 million tons grading 5.2% Cu and 40 g/t Ag and pre-mining reserve of 600,000 tons grading 16% copper) believed to be one of the highest-grade copper deposits ever to be mined in Zambia.

In the 1970s high grade ore in excess of 26% copper, making up approximately 20% of the orebody, was trucked for direct smelting at other mines in the Copperbelt. Kalengwa was discovered by drill testing a coincident copper-in-soil anomaly and gravity anomaly and has characteristics of the Iron-Oxide-Copper-Gold ("IOCG") class of deposits. FQM has provided Tertiary with an extensive exploration database for Mushima North which includes airborne magnetic and electromagnetic geophysical data, as well as 500m spaced reconnaissance soil sample analytical results.

Additional historical data for the area was made available by JAW Consulting LLC of Golden, Colorado which was commissioned by the Company to compile historical data and provide a detailed interpretation and targeting report. The JAW targeting report has drawn on historical exploration from the 1970s onwards by Roan Consolidated Mines, African Minerals, Zamanglo Prospecting Ltd. and BHP Billiton. The latter was exploring for IOCG deposits (a class of mineral deposit that includes some of the largest in the world, including Olympic Dam in South Australia).

BHP planned two holes to test for IOCG mineralisation at target C1 but terminated all exploration in Zambia in 2012 without drilling the planned holes. Further details of the targets generated by this report can be found in the Company's news release of 1 June 2023. Targets A1 and A2 were identified from wide spaced reconnaissance soil sampling carried out by FQM.

In September 2023, the Company contracted Geo-Junction Consulting Limited to perform a soil sampling programme at Mushima North to cover the C1, A1 and A2 targets. Positive results from target C1 were released on 5 October 2023. This release details the pXRF analytical results from targets A1 and A2.

A total of 184 samples were collected on or around target A1 with a sample spacing of 200m. Soil samples were collected from the B-horizon1, dried and sieved to -180 micron. The sieved soil samples were placed into a sample cup and analysed using a pXRF instrument.

Based on preliminary field pXRF analysis infill sampling was then carried out on 100mx 100m spacing with three 400m spaced lines sampled at 50m spacing. pXRF results from target A1 indicate a broad northeast striking copper-in-soil anomaly which, at a 80ppm copper cut off, covers an area approximately 3km long by up to 1.5 km wide. Within this area soil samples average 148ppm and peak at 280ppm copper.

The A1 soil anomaly has a high-grade core at its north end where all soil values are in excess of 200pppm copper over an area 400m x 150m and average 231ppm copper. pXRF results from target A2 show very high copper-in-soil values of up to 1,239ppm. However, the high values are confined to organic rich sediments at the edge of a dambo (an area of shallow wetland).

It is most likely that copper in these sediments is a result of hydromorphic concentration of copper in groundwater sourced from a copper-rich area, possibly the sources of the A1 copper anomaly some 3km distant. The A1 and A2 copper-in-soil anomalies have a favorable structural setting for mineralisation and the A1 anomaly is a further high priority for follow up drilling. During the field work at targets A1 and A2, samples containing visible spotty copper minerals malachite and chrysocolla were found when field checking an area 2 km west of target A1 where an electrical conductor had been identified by a previous explorer in an area underlain by iron-rich conglomerates.

These conglomerates stretch over a 6 km strike length and are coincident with a low-level gravity anomaly. Surface samples contained up to 0.43% copper (average of three pXRF readings per sample). Soil samples around this new occurrence were not anomalous but the new find warrants further follow-up mapping and sampling.