Rome Resources PLC Regulatory News (RMR)

2 July 2026

Rome Resources plc("Rome Resources" or the "Company")

Kalayi Assays Support Resource Update

Rome Resources plc (AIM: RMR), the DRC focused critical minerals explorer, is pleased to provide the final assay results from its recent drilling campaign at the Kalayi deposit within the Bisie North Project.

These assay results complete the latest drilling programme and will now be incorporated into an updated Mineral Resource Estimate ("MRE"), targeted for July 2026. The current Kalayi MRE, announced in November 2025, comprises an Inferred Mineral Resource of 0.33Mt grading 1.36% tin for 4.47kt of contained tin. The updated MRE is expected to quantify the impact of the latest drilling campaign on that resource.

Alongside the assay programme, the Company continues to advance the Kalayi pilot mining project and has completed the airborne geophysical survey, both of which are expected to support the next phase of development and exploration at Bisie North.

Highlights

· Final assays received for all drill holes from the recent Kalayi drilling campaign

· Standout drill intercepts with grades of mineralisation (weighted by sample length) and depths tested include:

o KBDD025: 9.5m at 2.05% Sn from 60.0m, including 6.0m at 3.12% Sn including 3.0m at 5.66% Sn

o KBDD033: 19.5m at 0.52% Sn from 144.0m, including 1.0m at 3.23% Sn and 1.0m at 2.87% Sn

o KBDD034: 5.0m at 1.88% Sn from 225.0m, including 1.5m at 4.77% Sn

o KBDD029: 6.5m at 0.97% Sn from 220.0m, including 1.5m at 3.24% Sn

· Latest drilling campaign demonstrates wider tin mineralised zones than previous drilling campaigns whilst maintaining high-grade tin intervals

· Length-weighted average tin grade from all samples in this campaign above a 0.5% cutoff is 2.41%, representing world-class grade potential

· Results to be incorporated into the updated Kalayi Mineral Resource Estimate, targeted for July 2026

· Simple cassiterite mineralogy and strong tin grades continue to support the potential suitability of Kalayi as feedstock for the nearby Bisie tin mine, operated by Alphamin

· Pilot mining project and airborne geophysical survey continue to advance in parallel

Assay Results

The Company has now received all of the laboratory assay results from drill holes KBDD019 to KBDD034, completing the most recent drilling programme at Kalayi. 

The objective of the programme was to improve geological continuity and increase contained tin within the Kalayi resource through wider mineralised intercepts. The wider mineralised zones encountered during the programme are expected to strengthen the geological model and is expected to provide a solid foundation for the updated Mineral Resource Estimate.

The latest drilling has continued to demonstrate broader zones of mineralisation than previous Kalayi campaigns, whilst maintaining high-grade tin intervals within those wider intercepts. Drill holes KBDD025, KBDD029, KBDD033 and KBDD034 represent the standout intersections from the programme.

The length-weighted average grade of mineralisation for all samples analysed in this campaign above a cutoff of 0.5% tin is 2.41% (65 samples). This potentially puts the Kalayi deposit in the same league as a handful of global tin projects with an average grade of over 2%.

Table 1 compares all significant Kalayi drill intercepts since exploration commenced at Kalayi and illustrates the wider mineralised zones achieved during the latest campaign.

Table 1 Kalayi Intercept table, intercepts greater than 6m highlighted in yellow

Drillholes KBDD025, KBDD027 and KBDD033 demonstrate this trend by returning tin intercepts of 9.5m at 2.05%, 3.5m at 2.92% and 19.5m at 0.52% respectively.

Management believes that these results will materially strengthen the geological model and expects that the updated MRE, targeted for July 2026, will demonstrate a meaningful increase in contained tin compared with the November 2025 maiden MRE. The results are subject to MSA Group (Pty) Ltd's review.

Other Operational Progress

Alongside completion of the assay programme, Rome Resources continues to advance a number of parallel workstreams across Bisie North.

The pilot tin mining project continues to progress and is expected to support conversion of the current Small Scale Exploitation Permit into a full Mining Licence, while also providing valuable geological, metallurgical and processing information ahead of potential future development.

Processing of the recently completed airborne geophysical survey data is also progressing, with the results expected to improve the Company's understanding of the wider Bisie mineralised system. This will help identify and prioritise additional exploration targets across the licence package.

Paul Barrett, Chief Executive Officer of Rome Resources, commented:

"We are delighted to now have received the final assays from the latest Kalayi drilling campaign, which now enables us to progress the updated tin MRE for Kalayi targeted for in or around July 2026.

The latest programme has continued to demonstrate wider mineralised zones than previous campaigns whilst maintaining high-grade tin intervals. Our objective has been to improve continuity and increase contained tin within the Kalayi resource, and we believe these results provide a strong foundation for the forthcoming MRE.

A length-weighted average grade of 2.41% tin across all mineralised samples above a 0.5% cut-off represents an exceptionally high average grade for a tin exploration project and compares favourably with many of the world's leading tin deposits.

Whilst we progress to an updated Kalayi MRE, a number of important workstreams continue in parallel, including interpreting the airborne geophysical survey, acquired to assess further potential on the licences, the pilot tin mining scheme supporting our transition to a full Mining Licence, and exploration fieldwork at the New Brunswick critical minerals project in eastern Canada - which Rome Resources currently has an option over. 

Together, these initiatives continue to advance Kalayi towards development while providing multiple opportunities to further enhance shareholder value as we move through the second half of 2026."

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Qualified Person Statement

Dr. Paul Armitage is a consultant of Rome Resources plc, a qualified geologist, a Fellow of the London Geological Society and a Member of the Institute of Materials, Minerals and Mining. Dr. Armitage is a qualified person (QP) under NI 43-101 and as defined by the AIM Note for Mining, Oil and Gas Companies for the purposes of this announcement and has reviewed and approved the scientific and technical information contained in this news release.