REG — Oriole Resources PLC — High — grade Limestone Confirmed at Wapouzé Project

For best results when printing this announcement, please click on link below: RNS Number: 0518W Oriole Resources PLC 24 September 2026 The information contained within this announcement is deemed to constitute inside information as stipulated under the retained EU law version of the Market Abuse Regulation (EU) No. 596/2014 (the "UK MAR") which is part of UK law by virtue of the European Union (Withdrawal) Act 2018. The information is disclosed in accordance with the Company's obligations under Article 17 of the UK MAR. Upon the publication of this announcement, this inside information is now considered to be in the public domain.

Oriole Resources PLC (“Oriole Resources” or the “Company”) High-grade Metamorphosed Limestone Confirmed at the Wapouzé Project Environmental and Social Impact Assessment Underway Oriole Resources (AIM: ORR), the AIM quoted exploration and development company focused on Central and West Africa, is pleased to announce results for the maiden diamond drilling programme (the “Programme”) at its 85%-owned Wapouzé limestone project (“Wapouzé” or the “Project”) in north-eastern Cameroon.

Furthermore, a local-level Environmental and Social Impact Assessment (“ESIA”) is currently underway at the Project to support the submission of an Exploitation Licence Application (“ELA”) in Q4-2026. 50m vertical depth from surface. · Marble units were encountered within every hole of the Programme with the majority of holes returning high-quality carbonate material (high CaO, >50wt%, and low MgO, 54wt% CaO intervals that we believe should qualify for use as chemical lime, which is a relatively valuable commodity and used in gold ore processing, but also in many chemical industry processes. ” Figure 1.

Wapouzé Programme drill plan showing the average chemistry from notable marble intervals. Plotted on MAXAR satellite image, and showing rock-chip sampling results with MgO values of less than 5wt% and more than 50wt% CaO shown in yellow. Samples with >50wt% CaO and 50% CaO with low magnesium and silica) material that would make it potentially suitable for use in the cement industry (see announcement dated 21 April 2026). 80m in 21 holes.

Samples were analysed for major element chemistry via x-ray fluorescence (XRF) at SGS South Africa and the QAQC was considered good throughout. Intersections have been calculated based on lithological continuity and where all individual intervals recorded CaO >42wt%, which is the lower limit required for clinker, while noting that the majority of individual intervals often exceeded 50wt% CaO (Table 1). 50m) of non-limestone material (such as schists, quartzites and meta-volcanic intrusions), but their chemistry has not reduced the overall average CaO within the respective intervals. e.

>5wt%). ˚These non-carbonate beds could readily be blended into an Ordinary Portland Cement (“OPC”) raw mix composition bringing valuable silica and alumina without pushing overall MgO above the 2% OPC raw mix threshold. Certain intervals in the boreholes show CaO content above 54%. This very pure limestone should satisfy criteria for high grade chemical lime manufacture, a valuable commodity in both the chemical and mining industries, particularly gold ore leaching.

5% of the total Programme. The material has been retained to enable future analysis should it be required. Table 1. Downhole intersections of logged marble units from the Programme.

Reported grades are length-weighted averages of all assayed samples within each interval, where individual samples are >42 wt% CaO. Intervals 50wt% CaO and <2% MgO) over more than 50% of their length. With such high overall CaO content, the chlorite schist and quartzite could be mined simultaneously, incorporated into a raw mix whilst maintaining a lime saturation coefficient well over 1. Table 2.

Cumulative downhole length of logged marble units in each drill hole, together with length-weighted average CaO and MgO grades and the proportion of the total drilled length represented by logged marble. 22 A ground geophysical survey has also recently been completed by the Company’s Cameroon partner Bureau d’Etudes et d’Investigations Géologico-Minières, Géotechniques et Géophysiques (“BEIG3”).

This survey, together with the geochemistry presented today and a range of other exploration data (geological mapping and rock chip sampling), has been given to Forge International, the Company’s Independent geological consultant, to enable its estimation of a maiden JORC MRE and/or Exploration Target. The MRE is expected to be reported in early Q4-2026. Commercially, a significant limestone deposit at Wapouzé could be highly suitable for use within Cameroon's cement industry, which is believed to be worth several hundred million pounds per year, largely supported by expensive imports of required clinker material.

The Company believes that there is a significant demand for cement (for concrete) within Cameroon and neighbouring Chad (with its capital, N'Djamena, approximately 250km NNE of Wapouzé). Furthermore, Cameroon has seen substantial foreign investment made into expanding its cement manufacturing capacity, with neighbouring plants to Wapouzé producing cement from similar material, and the government is keen to see its reliance on imported clinker reduce significantly. Oriole Resources is continuing its discussions with potential industry partners that could advance Wapouzé towards development and exploitation on an expedited basis.

The Company is ultimately looking to achieve royalty-based income from a commercial scale quarrying operation, likely to be based upon the volume of material extracted, which would provide valuable in-country revenue that could be used additional funding for its gold exploration work in Cameroon. As part of this process, the Company has engaged Jurilex International to complete a local-level ESIA for Wapouzé which, once completed, will form part of an Exploitation Licence application for the Project. This is expected to be for a simple quarry operation for the extraction of the marble. It is anticipated that the ELA will be submitted in Q4-2026.

For further information on Wapouzé, including maps and a JORC Table 1, please see the following page of the Company's website ( ).

) Clinker is inert for transport or storage but once ground to a fine powder with a small proportion of gypsum becomes Ordinary Portland cement (OPC) Company Oriole Resources PLC Dolomite A sedimentary rock composed primarily of calcium magnesium carbonate ELA Exploitation Licence Application ESIA Environmental and Social Impact Assessment Exploration Target An estimate of the exploration potential of a mineral deposit, expressed as a range of tonnes and grades, where there has been insufficient exploration to estimate a Mineral Resource Footwall The block of rock underlying a fault, orebody, or mine working Forge Forge International Limited g/t Grammes per tonne Hangingwall The block of rock overlying a fault, orebody, or mine working JORC Joint Ore Reserves Committee JORC Code 2012 Edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves km Kilometre m Metres MgO Magnesium oxide MRE Mineral Resource Estimate Ordinary Portland Cement (OPC) A fine grey powder made by heating limestone and clay minerals in a kiln to form clinker, then grinding it with a small amount of gypsum.

It is the most common type the most common type of hydraulic cement used as a basic binding agent for concrete, mortar, stucco, and general construction worldwide of hydraulic cement used as a basic binding agent for concrete, mortar, stucco, and general construction worldwide Oriole Resources Oriole Resources PLC QAQC Quality Assurance Quality Control Wapouzé Wapouzé limestone project in northern Cameroon wt% Weight percent is a way to measure the concentration of a mixture or solution by comparing the mass of one component to the total mass of the entire mixture XRF X-ray fluorescence, an analytical technique used to determine the elemental composition of a material Notes to Editors Oriole Resources PLC is an AIM-quoted gold exploration and development company, with projects in Central and West Africa.

It is currently focused on projects in Cameroon. At its district scale Central Licence Package (CLP) in Cameroon, the Company has identified multi-kilometre long gold anomalies, including at its flagship Mbe project. 05g/t Au for the MB01-N deposit. Following the completion of the MB01-N drilling programme, and by meeting various financial commitments, BCM International (“BCM”) has earned a 50% interest in the Mbe project, and Oriole has recently completed a corporate restructuring to confirm the Company's and BCM's respective 50% interest in Mbe.

Drafting of a JV partnership agreement is nearing completion. 06g/t Au in the JORC Indicated and Inferred categories at its 50% owned Bibemi project in Cameroon, where it has applied for an Exploitation Licence. In November 2025, BCM completed its earn-in to give it a 50% interest in Bibemi by meeting certain payment conditions, including spending US$4 million on exploration. 80m in 21 holes.

The Company anticipates that results from this programme, a recently completed ground geophysics (resistivity) survey and historical surface exploration, will support the delivery of a maiden MRE and/or a JORC Exploration Target for the Project in early Q4-2026. 8 million. 84g/t Au for 380,000oz to 650,000oz contained gold for all prospects at Senala. 20 g/t Au from diamond drilling.

A JV agreement was signed in July 2026 with a US$2 million work programme planned for the current field season. The Company also has several interests in companies operating in East Africa and Turkey that could give future cash payments. For further information please visit ( ), @OrioleResources on X 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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