Further Gold Mineralisation at Mbe South Deposit

Oriole Resources PLC (AIM: ORR), the AIM quoted gold exploration and development company focused on Central and West Africa, is pleased to announce initial results from the Step-out diamond drilling programme (the "Programme" or "Phase 3") at the MB01-S deposit at its 50%[1] owned Mbe orogenic gold project ("Mbe" or the "Project") in Cameroon. The total JORC Inferred Mineral Resource Estimate ("MRE") at Mbe currently stands at 1.23 million oz contained gold ("Au") across both MB01-S and MB01-N deposits. Following completion of the Programme next month, it is anticipated that an updated JORC MRE will be reported for MB01-S in early Q3-2026.

Highlights

• Results from the first three holes in the Programme, MBDD040 to MBDD042, have returned 30 mineralised gold intersections, including:

o MBDD041

§ 1.00m at 59.00g/t Au from 58.40m

§ 10.50m at 2.46g/t Au from 93.80m, including 3.10m at 7.56g/t Au

§ 1.10m at 5.64g/t Au from 88.30m

§ 2.00m at 3.00g/t Au from 133.40m, including 1.00m at 5.44g/t Au

o MBDD040

§ 3.00m at 2.82g/t Au from 214.60m, including 1.00m at 7.38g/t Au

§ 3.00m at 2.54g/t Au from 40.50m, including 1.00m at 6.51g/t Au

§ 4.80m at 0.96g/t Au from 53.70m, including 1.10m at 3.07g/t Au

o MBDD042

§ 1.00m at 2.53g/t Au from 134.10m

• MBDD040 is the most northern hole drilled to date at MB01-S and has extended the strike length of the system by a further 100m to approximately 600m
• MBDD041, located 100m to the south of MBDD040 has confirmed the northeastern extension of previously reported high-grade mineralisation in Phase 1 hole, MBDD019, which included 6.15m at 19.67g/t Au from 113.50m, including 1.00m at 119.10g/t Au.
• The Programme, planned for 2,500m in 10 holes, is now approximately 70% complete. Upon receipt of full results for the Programme, an updated MRE will be prepared for MB01-S with a targeted publication date of early Q3-2026.
• Transfer of the Mbe licence from Oriole Cameroon SARL to Oriole Mbe SARL has been approved by the Ministry of Mines and the restructuring process announced on 17 October 2026 is nearing completion.

Chief Executive Officer of Oriole Resources, Martin Rosser, said: "The initial assay results for a new drilling programme are always eagerly awaited and we are extremely pleased with those from MB01-S. They encompass thirty mineralised gold intersections and show good mineralised widths, plus a narrow high-grade intersection, as seen in previous results, and have extended the mineralisation strike length at the deposit by some 20 per cent. to around 600m. The Programme is currently around two-thirds complete and we are encouraged that there should be a meaningful increase to the JORC MRE for the MB01-S deposit once drilling is completed and the Company's independent geological consultant has completed an updated estimate, which is expected to be published early in Q3-2026."

Figure 1. Plan view of MB01-S showing the Step-out programme drilling progress, selected best results from MBDD040 to MBDD042, drill collars from Phase 1 drilling and gold mineralised wireframes for the 870koz Au MRE within a US$3,200/oz pit shell.

The Step-out diamond drilling programme at the MB01-S deposit, which commenced in March 2026 (see announcement dated 31 March 2026), was planned for 2,500m in 10 holes. It was designed to expand the existing 870,000oz contained gold JORC MRE at MB01-S, which is currently open in all directions and at depth, by testing the potential extension of the mineralised system. All holes were planned to be drilled towards the west (at an azimuth of 270 ˚) and at an inclination of -50 ˚, therefore in the same orientation as the majority of holes in the Phase 1 drilling programme (see announcement dated 2 September 2025).

The Company today reports the first results from the Programme, for holes MBDD040 to MBDD042, which targeted the northward extensions of MB01-S. MBDD040 is located on a new fence line, N872982, approximately 100m north of the Phase 1 drilling grid, and has confirmed an extension of the deposit's strike length to approximately 600m. Holes MBDD041 and MBDD042 were drilled to the west and east respectively of previously reported hole MBDD018, on fence line N872882. MBDD041 in particular has delivered high-grade results, including 1.00m at 59.00g/t Au from 58.40m and 10.50m at 2.46g/t Au from 93.80m including 3.10m at 7.56g/t Au.

Table 1. Calculated intersections from Phase 3 holes MBDD040 to MBDD042, using a 0.20g/t Au lower cut-off grade. Results greater than 1.00g/t Au are in bold and 'including' intervals are in bold italics.

The 1.00m at 59g/t Au interval is related to a narrow but high-grade interval that reflects a NNE-trending zone of vein breccia, with a near-vertical dip towards the WNW.

Figure 2. Core box image of MBDD041 showing 1.00m at 59.00g/t Au interval at 58.40m depth, related to a NNE-trending brecciated silica vein with significant sulphide-telluride mineralisation and epidote veinlets that cross-cut orthogneiss basement rocks.

The 10.50m at 2.46g/t Au interval shows evidence of shallower-dipping (55-60 ˚) mineralisation related to NNW trending (WSW dipping) sulphide-telluride veinlets formed by the infill of brittle fractures within a broadly NE-SW trending (SE-dipping) felsic dyke and as veins/veinlets within the orthogneiss host rock.

Both mineralisation styles highlighted conform with the interpreted NNW-SSE and NNE-SSW conjugate fault system interpreted at MB01, but highlights once again the structural complexity within the deposits at Mbe.

The high-grade intersections in MBDD041 are interpreted to reflect the along-strike extension of mineralisation observed in MBDD019, where 6.15m at 19.67g/t Au from 113.50m, including 1.00m at 119.00g/t Au was previously reported (see Announcement dated 26 August 2025), and shows comparable alteration styles.

Figure 3. Core box image showing the higher grade portion of the 10.50m at 2.46g/t Au intersection, from 93.80m in MBDD041. Broadly NNW trending (WSW dipping) sulphide-telluride veins and veinlets within a NE-SW trending (SE-dipping) felsic dyke are highlighted by the red boxes.

Figure 4. Simplified cross section of fence line N874882 with newly reported results from MBDD041 and MBDD042, selected results from previously reported MBDD018, and interpreted mineralised zones. Previously reported results are also shown for trench MBT006, located approximately 30m to the north.

Figure 5. Simplified cross section of fence line N874982 with newly reported results from MBDD040 and interpreted mineralised zones.

The Programme at MB01-S is currently 70% complete. Once all results have been received, Oriole will engage an independent consultant to prepare an updated JORC MRE for the deposit, which currently stands at 870koz contained Au and remains open in all direction. Any increase to this MRE will, also increase the 1.23Moz total resource base at Mbe. Publication of the updated MRE is expected in early Q3-2026.

Work is underway to formalise BCM's 50% beneficial interest in Mbe, with the drafting of a joint venture partnership agreement nearing finalisation. In addition, transfer of the Mbe licence from Oriole Cameroon SARL to Oriole Mbe SARL has been approved by the Ministry of Mines and the restructuring process announced on 17 October 2024 is nearing completion. The last outstanding step is to acquire the 10% interest in the licence held by Oriole's local partners, BEIG3 Sarl and Roxanne Minerals Limited, for US$100,000, which will formalise the Company's 50% interest in the Mbe licence.

Background on Mbe

After highly encouraging results from infill soil sampling, rock-chip sampling, and trench sampling, a fully funded maiden drilling programme at the MB01-S target was completed in September 2025 for 6,828.40m in 24 holes. Best drilling results included 86.50m at 1.36g/t Au from 22.00m, including 39.40m at 2.00g/t Au (hole MBDD008), 21.30m at 1.61g/t Au from 2.40m (MBDD012) and 6.15m at 19.67g/t Au from 113.50m, including 1.00m at 119.10g/t Au (MBDD019). In October 2025, a maiden MRE was published for the MB01-S deposit of 870,000oz at 1.09g/t, using a US$3,200/oz gold price and a cut-off grade of 0.40g/t Au. Mineralisation at MB01-S remains open in all directions and at depth and is in part being targeted by the ongoing, fully funded, MB01-S step out drilling programme which commenced in March 2026.

At the MB01-N target, 700m to the northeast of MB01-S, a 2,982.80m drilling programme in 15 holes was completed in February 2026. Best drilling results included 21.70m at 3.13g/t Au including 7.20m at 8.19g/t Au (from hole MBDD026), 56.20m at 0.99g/t Au, including 14.60m at 2.03g/t Au and 24.00m at 0.37g/t Au, including 2.00m at 2.21g/t Au (from hole MBDD039), and 16.10m at 2.49g/t Au including 1.00m at 28.60g/t Au, 2.00m at 6.57g/t Au and 14.80m at 0.73g/t Au (from hole MBDD027). The maiden MRE was published in April 2026 and stands at 360,000oz at 1.05g/t, using a US$3,200/oz gold price and a lower cut-off grade of 0.40g/t Au. This increased the total resource at Mbe which currently stands at 1.23Moz contained Au.

Following completion of the MB01-N drilling programme, and the meeting of various financial commitments, BCM has acquired 50% interest in the project.

[1] Following the completion of the MB01-N drilling programme in February 2026, BCM International has achieved a 50% beneficial interest in Mbe and work to formalise this interest in underway. Oriole currently has a 40% interest but is undertaking a restructuring process that, once completed, will see it increase its interest in the Project to 50% (see announcement dated 17 October 2024). The transfer of the licence, to Oriole Mbe SARL, has recently been approved by the Ministry of Mines, enabling Oriole to commence the final steps to complete the process.