Rome Resources PLC Regulatory News (RMR)

9 April 2026

Rome Resources plc

("Rome Resources", the "Company")

Drilling programme completed

Kalayi drilling completed; strong tin results support resource update

Rome Resources plc (AIM: RMR), the DRC-focused tin and copper explorer, is pleased to provide an update on its drilling operations at the Kalayi prospect within its Bisie North project in the Democratic Republic of Congo ("DRC"), located approximately 8 km from the world-class Alphamin Mpama tin mine complex.

Drilling operations for the current drilling campaign completed on 4 April 2026, having been active since December 2025. The Kalayi prospect represented the bulk of the total metres drilled, being 91%, where the board of directors of Rome Resources (the "Board") believe the presence of near surface high-grade tin mineralisation exists and the potential for continued mineralisation at depth. 

The highlights of the drilling campaign are set out below. The Company now looks forward to receiving the formal assays for the tin intercepts encountered. These results will in turn be incorporated into the subsurface model. It is also expected that an updated Mineral Resource Estimate, which could deliver a meaningful uplift, will be announced in due course.

Highlights

· The Board believes that drilling confirms the presence of high-grade tin mineralisation which continues at depth and across multiple holes, supporting the Company's structural model

· Widest and strongest intercepts to date delivered during the current drilling campaign

· Clear progression in grade and width of mineralisation versus previous campaigns

· 17 holes drilled for 3,050m, with Kalayi representing the majority of metres

· Assays pending, to feed into updated Mineral Resource Estimate

· Updated MRE expected in the coming weeks

Kalayi Drilling Programme

Drilling operations for the recent drilling campaign were completed on 4 April 2026 following the drilling of 17 holes for a total of 3,050m. The Kalayi prospect represented the bulk of the total metres drilled, being 91%, targeting what the Board believes to be the presence of near-surface high-grade tin mineralisation and the potential for its continuation at depth. Portable XRF results from the programme continue to support the Company's structural model for the deposit, with the presence of high-grade tin mineralisation encountered across multiple holes.

The Board now looks forward to receiving formal laboratory assays for the tin intercepts encountered, and these will be incorporated into the subsurface model and are expected to inform an updated Mineral Resource Estimate.

Drilling results update

Highlights of the recent drilling campaign include multiple highly encouraging tin intercepts which have been provisionally assessed using a handheld XRF device.

Figure 1 shows a semi-quantitative comparative overview of the results from the current and previous campaigns. To demonstrate the positive progression in overall tin richness of the various intercepts as the programme has evolved, intercept richness is presented as the product of intercept width and tin percentage (using existing assays for the previous campaign and XRF readings for the current campaign).

On this basis, the top five intercepts from the recent drilling campaign exceed the maximum richness recorded in any previous campaigns intercepts and are additionally shown in Figure 2.

It should be noted that this comparison is based on a combination of historical assay data and current XRF readings and is therefore indicative only. However, for wider intercepts (such as those exceeding 10m), the impact of averaging is much reduced.

Figure 1. Relative richness of tin intercepts at Kalayi

(Richness defined as width in metres multiplied by tin %, either XRF or assays)

Figure 2: Location of Kalayi intercept richness values >6 from Figure 1

Results from the current campaign represent the strongest set of intercepts recorded at Kalayi to date.

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

"The tin intercepts encountered in this recent drilling campaign underscore Kalayi's potential as an extensive high grade tin deposit situated only 8km from a mine producing over 7% of the world's tin.

While final assays are pending, these early indicators provide a compelling case for Kalayi's economic potential and suggest a clear step forward compared to previous drilling campaigns.

Over the coming weeks, as assays are received and incorporated into the geological model, we expect to advance the proposed Mineral Resource Estimate update and continue to assess future development pathways for Kalayi, both technical and commercial."

Use of XRF for initial results

The portable XRF currently used at Bisie North is a Bruker S1 Titan model. Readings represent averages of 60-second continuous analysis along 1m sections of core. The X-ray beam is emitted through an active area of 20mm2 and penetrates up to several millimetres into the drill core.

The metal grades determined by the portable XRF are indicative only, although they are calibrated against known standard samples. They should not be relied upon for resource estimation. Samples from completed drillholes will be submitted for laboratory assay, with results to be reported in due course. For critical core intervals, up to four passes are made with the XRF on lines along the core at 90 degrees separation around the core diameter and averaged to increase the confidence in the results.

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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.

The handheld Bruker XRF is frequently checked and calibrated to ensure accurate analysis.