Announcement PDF RNS Number : 3300A Rome Resources PLC 26 October 2026 26 October 2026 Rome Resources plc (“Rome Resources” or the “Company”) New Brunswick Project Update: 2.6km Tin-Bearing Breccia Trend ​ Identified Within Mount Pleasant Caldera Mount Pleasant-style mineralising system identified on Rome’s ground; assays pending; option to be exercised Rome Resources plc (AIM: RMR), the DRC and Canada-focused critical minerals explorer, is pleased to provide an exploration update on its New Brunswick Project in southwest Canada (“Project”), where field operations have confirmed multiple zones of tin, tungsten and indium mineralisation within the same intrusive igneous complex that hosts the Mount Pleasant tin-tungsten deposit - one of the largest known tin-tungsten occurrences in North America. Highlights 2.6km mineralised tin-bearing quartz breccia identified at Scoullar Mountain, within the central part of the Mount Pleasant Caldera, a few kilometres east of the historic Mount Pleasant mine, with assays pending Breccias contain stannite, a sulphide ore of tin, alongside purple fluorite. At Mount Pleasant, indium is associated with stannite, sphalerite and purple fluorite, and the identification of this same assemblage on Rome’s ground indicates the Company is working within the same mineralising system Trenching has been completed across a cluster of assayed samples returning up to 0.58% tin and 0.17% tungsten at Victoria Lake, with further assays pending Positive results returned from all three key target areas: the late-stage greisenised roof zone of the Mount Douglas Granite ("MDG") at Victoria Lake, the eastern margin of the MDG at Square Lake, and the Mount Pleasant Caldera at Scoullar Mountain Systematic 2026 field campaign comprises 340 outcrop samples and 360m of trenching to date, with field operations ongoing across the 109km² option area Earlier sampling returned 17ppm indium, 0.8% bismuth and 1.5% copper, confirming the polymetallic critical mineral potential of the system Indium is a critical mineral used in display screens, contact surfaces in data centres and solar technology, classified as high supply-risk by both the EU and US governments The Mount Douglas Granite is coeval with the adjacent Mount Pleasant caldera deposit, one of the largest known tin-tungsten-indium occurrences in North America Rome will exercise its options over its New Brunswick claims, acquiring 100% of the working interest of a 109km² land package Subsequently, a further land package has been secured through Rome’s partner, taking the position within the Mount Pleasant Caldera sub-area to approximately 40km², immediately east and northeast of the Mount Pleasant licence Rome is presenting at today’s 51st Annual 2026 New Brunswick Exploration, Mining and Petroleum Conference at the Delta Hotel, Fredericton NB at 1600 BST Paul Barrett, CEO of Rome Resources plc, commented: "Mount Pleasant is clearly a key deposit for several critical minerals, situated on the far western rim of the caldera. Our early exploration work indicates that critical mineralisation continues eastwards within the caldera and the evidence for that is now tangible. We have identified a 2.6km tin-bearing quartz breccia at Scoullar Mountain, containing stannite alongside purple fluorite. At Mount Pleasant, indium is associated with sphalerite, stannite and purple fluorite, so finding that same assemblage on our own ground tells us we are not simply working near a world-class deposit, we are working within the system that created it. At depth, these targets may develop into highly attractive drill targets that rival if not eclipse the current Mount Pleasant resource. This will be our focus in Canada in 2027, along with additional work along the prospective greisenised part of the Mount Douglas Granite to the southeast, where sampling at Victoria Lake has returned grades of up to 0.58% tin and 0.17% tungsten. Having established the quality of this ground, we have elected to exercise our options and taken full control of the Project, which sends a strong signal to the New Brunswick provincial government that we are here to stay and develop this play to its fullest potential. We are also continuing to assess opportunities to expand our footprint within this highly prospective corridor. Alongside Bisie North, our flagship asset in the DRC, we are building a strong and diversified portfolio of critical metals assets at a time when demand continues to increase. Assays from the Scoullar Mountain breccia and the Victoria Lake trenching are pending, and I look forward to reporting them." The Mount Douglas Granite and the Mount Pleasant System Rome’s New Brunswick Project comprises approximately 109km² of claims in southwest New Brunswick, focused on the tin, tungsten and critical mineral potential of the Mount Douglas Granite, a large Devonian-age intrusion responsible for the Mount Pleasant tin-tungsten-indium deposit, one of the largest known occurrences of its type in North America. Mount Pleasant is situated on the far western rim of the Mount Pleasant Caldera, with Rome’s Scoullar Mountain target area lying a few kilometres to the east within the central part of the same caldera. Mineralisation in this setting is principally greisen-hosted, occurring in zones within the upper margins of the granite system where hydrothermal fluids have altered the host rock and deposited tin, tungsten, bismuth, indium and molybdenum. In reduced granite tin systems of this type, mineralisation typically shows predictable spatial zonation, with tungsten concentrated closest to the granite contact, followed outward by tin as cassiterite and stannite, then copper and zinc at greater distance. Indium partitions preferentially into the tin and zinc-bearing mineral phases, and at Mount Pleasant is associated with these minerals in conjunction with purple fluorite, a pathfinder mineral indicative of a fluorine-rich, well-evolved granitic system. The 2026 field campaign has targeted three distinct settings within this system and has returned positive results from all three. Figure 1. Regional setting of Rome’s New Brunswick Project. The Mount Pleasant Caldera and the Mount Douglas Granite Exploration at Scoullar Mountain and the Mount Pleasant Caldera The Mount Pleasant deposit is formed of two distinct zones – a tungsten-molybdenum zone and a tin- indium zone. Rome Resources are focussing on tin and indium as main value drivers in its exploration area to the east of Mount Pleasant. Fieldwork has been progressing in this area with the taking of a number of representative field samples for assay. Indium is associated with stannite, sphalerite and purple fluorite at Mount Pleasant and the work in Rome’s exploration area has led to the identification of such fluorite and in addition quartz breccias containing stannite, a sulphide ore of tin. One such tin-bearing quartz breccia and porphyry zone has been newly mapped at 2.6km in length, oriented on trend with the Mount Pleasant deposit. This is a significant discovery and may be the result of the near-surface expression of a much larger mineralised granite/porphyry system at depth in the caldera, representing a high interest drill target for tin and indium exploration going forward. Assays from the zone are pending and will be reported in due course. In response to these additional discoveries, Rome’s partner has secured a further parcel of claims now amounting to a total of approximately 40km2 within the caldera immediately to the east and northeast of the Mount Pleasant licence (Figure 2). Figure 2. Rome’s claim position within the Mount Pleasant Caldera, east and northeast of the Mount Pleasant licence. Figure 3. Tin-bearing stannite in quartz breccia hand sample, Scoullar Mountain. (Field of view approx.. 10cm) Exploration in the Mount Douglas Area The Mount Douglas Granite comprises several phases, the third and final phase hosting the majority of the tin and tungsten mineralisation. The exploration programme in the granite has been designed to test high-grade areas ahead of trenching and potential drilling. Victoria Lake The Victoria Lake prospect lies along the late-stage greisenised roof zone of the Mount Douglas Granite and hosts several historical mineral occurrences. Rome’s 2026 programme has confirmed these and identified three additional occurrences not previously recorded. Mineralisation has been identified along a 300m wide zone, and a historical drillhole in this area demonstrated that tin mineralisation continues to depth. Trenching has been undertaken in an area containing a cluster of assayed samples with up to 0.58% tin and 0.17% tungsten. Over 370m of trenching has been carried out and a total of 54 samples sent for analysis, the results from which are pending. Additional 300m trenching programme is planned to commence in early November. Square Lake At Square Lake, along the eastern margin of the Mount Douglas Granite, a combination of historical occurrences and new discoveries has been identified and sampled. Results to date include a strong showing of bismuth at 0.8% from outcrop, with further targets identified for follow-up. Indium: Critical Mineral Context Indium is recovered as a by-product of tin and zinc processing and has no primary mines of its own. Its principal application is indium tin oxide, a transparent conductive film essential to LCD screens, touchscreen displays and flat-panel monitors, processor contacts in data centres, with further use in thin-film photovoltaic cells and LED semiconductors. Both the European Union and the United States classify indium as a critical raw material with high supply risk, reflecting the concentration of global supply in Chinese zinc smelting. Earlier sampling at the New Brunswick Project returned indium at 17ppm. The identification of purple fluorite at Scoullar Mountain, the mineral with which indium is associated with alongside indicator sulphide minerals at Mount Pleasant, supports the potential for indium as a by-product credit alongside the primary tin and tungsten potential of the Project. Exercise of Options The Company has decided to exercise its options over the exploration area. As previously announced, the exercise of the option to acquire 100% of the working interest in the New Brunswick exploration claims is to be satisfied principally by the issuance of 225,000,000 ordinary shares of the Company to Robert Murray, the Optionor (the “Consideration Shares”). The Consideration Shares are restricted to a limit on trading to the value of C$50,000 per annum until the third anniversary of their issuance. Forward Programme Assays are pending from the Scoullar Mountain breccia and from 54 samples submitted from the Victoria Lake trenching programme, and results will be announced as they are received. A further 300m of trenching is planned to commence at Victoria Lake in early November. Field operations will continue across all three target areas, and the Company will continue to assess opportunities to expand its footprint within the Mount Pleasant Caldera and the Mount Douglas Granite system. Subject to the results of the current programme, Rome intends to plan a core drilling campaign in 2027, with the Mount Pleasant Caldera the principal focus. Admission and Total Voting Rights The Consideration Shares will be issued as fully paid and will rank pari passu in all respects with the existing ordinary shares of the Company. Application will be made to the London Stock Exchange plc for the 225,000,000 Consideration Shares to be admitted to trading on the AIM market ("Admission") at 8:00 a.m. on or around 2 November 2026. Following Admission, the Company's issued share capital will comprise 8,351,625,932 Ordinary Shares. Upon Admission this number will represent the total voting rights in the Company and, following Admission, may be used by shareholders as the denominator for the calculation by which they can determine if they are required to notify their interest in, or a change to their interest in, the Company under the FCA's Disclosure Guidance and Transparency Rules. Qualified Person Statement Edward Loye, MSc, MCSM, FGS is a director of Rome Resources plc. Mr Loye is a qualified person as defined by the AIM Note for Mining, Oil and Gas Companies and has reviewed and approved the scientific and technical information contained in this news release. **ENDS** This announcement contains inside information for the purposes of Regulation 11 of the Market Abuse (Amendment) (EU Exit) Regulations 2019/310. With the publication of this announcement via a Regulatory Information Service, this inside information is now considered to be in the public domain. Glossary Quartz Breccia Silica-rich rock formed by fluid escape from mineralising fluids Porphyry Igneous intrusive rock containing larger crystals in a fine grained matrix, commonly associated with mineralisation Stannite A tin-copper-iron sulphide mineral commonly present in tin-bearing greisenised granites and tin porphyry systems Fluorite A fluorine-bearing mineral commonly associated with polymetallic hydrothermal mineralisation Sphalerite A zinc sulphide ore, capable of substituting indium for zinc Investor questions on this announcement We encourage all investors to share questions on this announcement via our investor hub https://romeresources.com/link/PKBmYr Rome Resources Plc Paul Barrett, Chief Executive Officer Tel. +44 (0)20 3143 6748 This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. 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