29 May 2025                                                                                

Savannah Resources Plc

(AIM: SAV) ('Savannah', or the 'Company')

Further robust zones of near surface higher-grade lithium mineralisation at Pinheiro and Reservatório

Savannah Resources plc, the developer of the Barroso Lithium Project (the 'Project') in Portugal, Europe's largest spodumene lithium deposit, is pleased to announce the third batch of assay results from Phase 2 of its Definitive Feasibility Study ('DFS') drilling programme at the Project. The 117-hole, c.13,000m programme is being undertaken for further JORC Resource definition, geotechnical and metallurgical purposes and today's results further highlight the potential for greater resources to be defined at the Project.

Highlights:

·    The Phase 2 drill programme for the DFS is moving towards completion, primarily targeting the Pinheiro, Reservatório and Grandão deposits.

·    To date 86 holes have been drilled for c. 10,393m in the planned 117 hole/c.13,000m programme.

·    New Significant lithium assays have been received from a further 26 holes (3 at Pinheiro, 21 at Reservatório and 2 at Grandão), taking the total number of holes assayed to date to 68.

·    At Pinheiro, we are continuing to intersect broad zones of higher-grade lithium mineralisation both near the surface and at depth on a routine basis. New intersections include:

o  43m @1.24% Li₂O from 15m in hole 25PNRRC034, including 5m @1.93% Li₂O

o  30m @1.5% Li₂O from 46m in hole 25PNRRC035, including 6m @1.82% Li₂O

o  19m @1.25% Li₂O from 50m in hole 25PNRDD015, including 8m @1.73% Li₂O and 47m @1.29% Li₂O from 73m including 9.2m @1.81% Li₂O making a total of 70m of near continuous mineralisation

·    At Reservatório, results continue to give very encouraging indications of multiple zones of higher-grade mineralisation and confirm the potential expansion of the resource to the northeast. Better intersections include:

o  38m @1.67% Li₂O from 41m in hole 25RESRC070, including 6m @2.17% Li₂O

o  34.91m @1.24% Li₂O from 99m in hole 25RESRC054 (includes 23.1m @ 1.28% Li₂0 from 99m previously reported from RC drilling)

o  31m @1.23% Li₂O from 71m in hole 25RESRC084

o  30m @1.26% Li₂O from 30m in hole 25RESRC066

o  28m @1.17% Li₂O from 42m in hole 25RESRC080, and 9m @ 0.86% Li₂O from 96m

o  26m @1.33% Li₂O from 49m in hole 25RESRC068

o  26m @1.10% Li₂O from 72m in hole 25RESRC062

o  21m @1.19% Li₂O from 100m and 13m @ 0.79% Li₂O from 124m in hole 25RESRC082

·    Recent results from Grandão confirm that mineralisation continues along strike and down dip with results including:

o  7m @1.38% Li₂O from 65m in hole 25GRARC144, including 4m @1.5% Li₂O

o  6m @0.97% Li₂O from 13m in hole 24GRARC147 and 4m @1.03% Li₂O from 23m and 11m @0.97% Li₂O from 30m

Savannah's Technical Director, Dale Ferguson said, "We have now completed 80% of the Phase 2 DFS drill programme and we are moving towards the completion of this critical phase of work. We are continuing to see further higher-grade zones of lithium mineralisation at Pinheiro combined with very good widths. This points towards the potential for an increase in the size of the Pinheiro resource and overall grade (last estimated at 2.0Mt at 1.0% Li₂O, Inferred). The recent batch of drilling results from Reservatório is also very encouraging with results suggesting there is potential to extend the resource further to the northeast.

"Overall, the potential for greater resources at the Project is reiterated by each batch of assays we receive. With the end of the programme approaching, the focus is now turning to the update of the JORC Resource models for the Grandão, Reservatório, and Pinheiro orebodies and the definition of a new Exploration Target[1] for the project (previously estimated at 11-19Mt at 1.0-1.2% Li₂O)."

Further Information

As previously announced, Savannah started Phase 2 of the DFS-related drilling programme at the Barroso Lithium Project in January 2025 (Figure 1). The programme consists of drilling for resource, metallurgical and geotechnical purposes using primarily Reverse Circulation ('RC') rigs with some supplementary diamond drilling (DD). To date, over 10,000m of drilling has been completed of the c.13,000m initially planned for Phase 2. The programme is ongoing, and further updates will be provided as more results are received.

Figure 1. Barroso Lithium Project summary map showing deposits and drill hole locations.

Pinheiro

The JORC Resource estimate for the Pinheiro deposit (all Inferred as at May 2024) is 2.0Mt at 1.0% Li₂O.

Results from the Pinheiro drilling continue to be positive with regular intersection of robust higher-grade zones of lithium mineralisation. We are particularly encouraged by the results from hole 25PNRDD015, a planned geotechnical hole, which intersected the pegmatite at an unmapped location and followed a zone of over 70m of virtually continuous lithium mineralisation down dip. Drill hole 25PNRRC034 is the northern most planned hole and intersected high-grade mineralisation across the width of the pegmatite, which points towards the excellent potential for an expansion of the current resource.

Significant recent lithium mineralisation intersections at Pinheiro include:

o  19m @1.25% Li₂O from 50m in hole 25PNRDD015, including 8m @1.73% Li₂O, and 47m @1.29% Li₂O from 73m, including 9.2m @1.81% Li₂O.

o  43m @1.24% Li₂O from 15m in hole 25PNRRC034, including 5m @1.93% Li₂O

o  30m @1.5% Li₂O from 46m in hole 25PNRRC035, including 6m @1.82% Li₂O, 2m @1.88% Li₂O, 2m @2.07% Li₂O and 2m @1.81% Li₂O

Figure 2. Location of Phase 2 diamond drilling at Pinheiro with significant intercepts to date.

Figure 3. Cross section 1 Eastern Pegmatite of Pinheiro deposit (Section A-A').

Reservatório

The JORC Resource estimate for the Reservatório deposit (Indicated & Inferred as of May 2024) is 4.2Mt at 0.9% Li₂O.

The drilling at Reservatório continued to deliver excellent results with multiple intersects, showing geological consistency, including in the areas where some natural variations were found in the first results received for the east end of the pegmatite. The latest results include encouraging intersects at the northeastern portion of the resource, which continue to point towards the potential for an expansion of the resource in this direction.

Significant mineralised intersections at Reservatório include:

o  38m @1.67% Li₂O from 41m in hole 25RESRC070, including 6m @2.17% Li₂O

o  34.91m @1.24% Li₂O from 99m in hole 25RESRC054, (includes 23.1m @ 1.28% Li₂0 from 99m previously reported from RC drilling)

o  31m @1.23% Li₂O from 71m in hole 25RESRC084

o  30m @1.26% Li₂O from 30m in hole 25RESRC066, including 3m @1.80% Li₂O

o  28m @1.17% Li₂O from 42m in hole 25RESRC080, including 6m @1.55% Li₂O

o  27m @1.25% Li₂O from 100m in hole 25RESRC050, including 10m @1.40% Li₂O

o  26m @1.33% Li₂O from 49m in hole 25RESRC068

o  26m @1.10% Li₂O from 72m in hole 25RESRC062, including 4m @1.49% Li₂O

o  18m @1.10% Li₂O from 82m in hole 25RESRC083, including 5m @1.52% Li₂O

o  16m @1.25% Li₂O from 86m in hole 25RESRC061, including 3m @1.68% Li₂O

o  17m @1.31% Li₂O from 29m in hole 25RESRC069, and 14m @1.07% Li₂O from 69m

o  13m @1.43% Li₂O from 125m in hole 25RESRC071, including 4m @1.98% Li₂O

o  15m @1.01% Li₂O from 61m in hole 25RESRC079, 5m @0.76% Li₂O from 82m, 6m @0.75% Li₂O from 109m

o  5m @1.03% Li₂O from 89m in hole 25RESRC082, and 21m @1.19% Li₂O from 100m and 13m @ 0.79% Li₂O from 124m

Drilling operations at Reservatório are still in progress, in the deeper portions dipping to the north.

Figure 5. Location of Phase 2 diamond drilling at Reservatório with significant intercepts from assays results.

Figure 6. Cross section 2 of Reservatório deposit (Section A - A').

Figure 7. Cross section 2 of Reservatório deposit (Section B - B').

Grandão

The JORC Resource estimate for the Grandão deposit (Measured, Indicated & Inferred as of May 2024) is 17.7Mt at 1.04% Li₂O.

The drilling at Grandão has continued to focus primarily on the southern extremities of the pegmatite and where it occurs nearer to the surface and will be part of the preliminary mining stages. The drilling has shown that the southern edge is thinner than the central part of the pegmatite with widths varying between 3m to 20m.

Significant mineralised intersections at Grandão include:

o  7m @1.38% Li₂O from 65m in hole 25GRARC144, including 4m @1.5% Li₂O

o  6m @0.97% Li₂O from 13m in hole 24GRARC147 and 4m @1.03% Li₂O from 23m and 11m @ 0.97% Li₂O from 30m

Figure 9. Location of Phase 2 drilling at Grandão with significant intercepts from assays results.

Next steps

The initial stage of the Phase 2 drilling is nearing completion and the results from this will feed into upgrading the confidence level of the existing resource estimations for each deposit. On top of this, it is planned to drill the Aldeia A deposit with the aim to infill the drilling to gain a 40m x 40m coverage to upgrade the existing Resource (3.5Mt at 1.3% Li₂O) that was previously outlined in 2019.

In conjunction with resource drilling, preparation of the specific requirements of core samples for metallurgical testing has commenced. Once results have been received the specific sample requirements requested by Savannah's metallurgical consultants will be sorted and sent for testing.

The drilling of diamond drill holes for geotechnical testing is complete at Pinheiro and is currently being carried out at Grandão and then onto Reservatório. The results from this programme will be used to aid in the design of the various mining pits to ensure maximum extraction of ore under safe and sustainable conditions.

Competent Person and Regulatory Information

The information in this announcement that relates to exploration results is based upon information compiled by Mr Dale Ferguson, Technical Director of Savannah Resources Limited. Mr Ferguson is a Member of the Australasian Institute of Mining and Metallurgy (AusIMM) and has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the December 2012 edition of the "Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves" (JORC Code) and as a qualified person under the AIM Rules. Mr Ferguson consents to the inclusion in the report of the matters based upon the information in the form and context in which it appears.

Regulatory Information

This Announcement contains inside information for the purposes of the UK version of the market abuse regulation (EU No. 596/2014) as it forms part of United Kingdom domestic law by virtue of the European Union (Withdrawal) Act 2018 ("UK MAR").

Savannah - Enabling Europe's energy transition.

**ENDS**

Follow @SavannahRes on X (Formerly known as Twitter)

Follow Savannah Resources on LinkedIn

For further information please visit www.savannahresources.com or contact:

About Savannah

Savannah Resources is a mineral resource development company and the sole owner of the Barroso Lithium Project (the 'Project') in northern Portugal. The Project is the largest battery-grade spodumene lithium resource outlined to date in Europe and was classified as a 'Strategic Project' by the European Commission under the Critical Raw Materials Act in March 2025.

Through the Project, Savannah will help Portugal to play an important role in providing a long-term, locally sourced, lithium raw material supply for Europe's lithium battery value chain. Once in operation, the Project will produce enough lithium (contained in c.190,000tpa of spodumene concentrate) for approximately half a million vehicle battery packs per year and hence make a significant contribution towards the European Commission's Critical Raw Material Act goal of a minimum 10% of European endogenous lithium production from 2030. Savannah is focused on the responsible development and operation of the Barroso Lithium Project so that its impact on the environment is minimised and the socio-economic benefits that it can bring to all its stakeholders are maximised.

The Company is listed and regulated on the AIM Market of the London Stock Exchange and trades under the ticker "SAV".APPENDIX 1: Drill hole locations of Completed Phase 2 RC and Diamond Resource Holes             (* with assays)

APPENDIX 2 - Summary of Significant Intercepts from the diamond drilling using a 0.5% Li₂O Cutoff.

*Significant results from RC hole, diamond tail to follow

** From completed diamond tail

APPENDIX 3 - JORC 2012 Table 1 - DFS Infill Drilling

JORC Table 1 Section 1 Sampling Techniques and Data

JORC Table 1 Section 2 Reporting of Exploration Results