MB01-S Step-out Drilling Programme Final Results

Oriole Resources PLC (AIM: ORR), the AIM quoted gold exploration and development company focused on Central and West Africa, is pleased to announce the final set of results from the recently completed step-out diamond drilling programme (the "Programme" or "Phase 3") at the MB01-S deposit at its 50% 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 the MB01-S and MB01-N deposits. Results delivered from the step-out programme have supported northern, western and southern extensions to the existing geological model and it is anticipated will increase the total resource at MB01-S. An updated MRE is now being prepared and will be published later in Q3-2026.

Highlights

• Results for the final two holes in the Programme, MBDD048 to MBDD049, have returned a further 13 mineralised gold intersections (using a 0.20g/t Au lower cut-off grade), including:

o MBDD048

• 16.40m at 1.65g/t Au from 116.80m depth, including 3.00m at 4.72g/t Au and 5.00m at 2.05g/t Au
• 2.00m at 1.20g/t Au from 87.60m
• 2.20m at 1.07g/t Au from 25.50m

o MBDD049

• 27.00m at 0.61g/t Au from 202.50m depth, including 5.00m at 1.71g/t Au and 3.00m at 1.05g/t Au
• The holes have confirmed a south-eastwards extension to the mineralisation which, together with the northern and western extensions reported previously in the Programme, underpins the potential for an expansion to the existing MB01-S MRE.
• Preparation of an updated MRE for MB01-S is underway with its publication expected later in Q3-2026.

Chief Executive Officer of Oriole Resources, Martin Rosser, said: "The final drill hole results for the MB01-S Step-out drilling conclude a successful programme and it is anticipated should increase the total resource at MB01-S from the current 870koz Au. Notably, MBDD049 supports the potential for further mineralised zones at depth to the east of the Phase 1 drilling, which will be considered in future programmes.

"The Company's independent geological consultant's updated MRE will be published later this quarter."

Figure 1. Plan view of MB01-S showing the step-out programme drill hole collar locations, selected best results from hole MBDD048 to MBDD049, previously reported best intersections from holes MBDD040 to MBDD047, drill collars from Phase 1 drilling and gold mineralised wireframes for the current 870koz Au MRE within a US$3,200/oz pit shell.

On 8 June 2026 the Company announced the completion of a step-out diamond drilling programme at the MB01-S deposit for 2,476.80m in 10 holes. The Programme was designed to expand the existing 870,000oz contained gold JORC MRE at MB01-S by testing the potential lateral and depth extensions of the mineralised system. All holes were drilled towards the west (at an azimuth of 270 degrees) and at an inclination of -50 degrees, 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 final set of results for the programme, related to holes MBDD048 and MBDD049, which targeted the southeastern extension of MB01-S. Both holes were drilled on the southernmost fence line to date, N872306, to the east of previously reported holes MBDD046 and MBDD047 (see announcement dated 1 July 2026).

Table 1. Calculated intersections for Phase 3 holes MBDD048 and MBDD049, 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.

Both holes returned gold-mineralised intersections, related to sulphide-telluride veinlets and breccias, and continued to demonstrate narrow higher gold grade zones within wider envelopes of lower grade mineralisation, for example 16.40m at 1.65g/t Au, including 3.00m at 4.72g/t Au and 5.00m at 2.05g/t Au (MBDD048) and 27.00m at 0.61g/t Au, including 5.00m at 1.71g/t Au and 3.00m at 1.05g/t Au (MBDD049). These results are expected to extend the limits of the current MRE to the southeast.

Figure 2. Core box photograph showing individual sample values within the reported 3.00m at 4.72g/t Au interval which sits within the wider 16.40m at 1.65g/t Au intersection from hole MBDD048. The red lines on the core mark the start and finish of the labelled mineralised intervals.

Figure 3. Simplified cross section of fence line N872306, with newly reported results for holes MBDD048 and MBDD049. Previously reported best results from MBDD046, MBDD047 are also shown together with results for trench line MBT009, located approximately 10m north of the fence line.

As previously announced, the MRE wireframes for modelling will be rotated from a N-S to NNW-SSE orientation (see announcement dated 8 June 2026), as a result of more detailed structural data since the maiden MRE.

In the context of the revised deposit orientation, mineralisation in MBDD048, potentially represents the along-strike extension of mineralisation previously reported in the core zone of mineralisation across holes MBDD008 and MBDD002 (N872482), and MBDD021 and MBDD022 (N872382) (see announcements dated 3 February 2025, 12 May 2025, and 22 September 2025). MBDD008, which is located approximately 200m to the northwest of MBDD048, returned 86.50m grading 1.36g/t Au, therefore one of the best results from drilling to date at MB01-S.

MBDD049 is the most eastern hole drilled to date, and the intersection of the core mineralised zone at approximately 200m downhole depth, supports a south to southeastern plunge to the mineralisation at this point in the system. Furthermore, this could support the potential for further mineralised zones at depth to the east of the Phase 1 drilling, along fencelines N872382 and N872482 and this will be considered in future programmes.

Oriole has now engaged its independent consultant to prepare an updated JORC MRE for MB01-S, which currently stands at 870koz contained Au and remains open in all directions. The updated MRE is expected later in Q3-2026 and any uplift will also increase the total resource base at Mbe which currently stands at 1.23Moz Au.

Competent Persons' Statement

The information in this announcement that relates to the MREs are based on data compiled by Robert Davies, EurGeol, CGeol, an independent consultant to Oriole. Mr Davies is a Director of Forge International Limited. Mr Davies has sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration and to the activity being undertaken to qualify as a Competent Person as defined in the JORC Code. Mr Davies consents to the inclusion in the report of the matters based on his information in the form and context in which it appears. The Company confirms that it is not aware of any new information or data that materially affects the MREs, and that all material assumptions and technical parameters underpinning the MREs continue to apply.

The technical information in this release that relates to exploration results and any planned exploration programme(s) has been compiled by Claire Bay (Executive Director). Claire Bay (MGeol, CGeol) is a Competent Person as defined in the JORC code and takes responsibility for the release of this information. Claire has reviewed the information in this announcement and confirms that she is not aware of any new information or data that materially affects the information reproduced here.

Background on Mbe

At the 3km long MB01 discovery, increased dilation at the sites of structural intersections (steeply dipping NNE and NNW trending shear structures) is believed to have resulted in enhanced levels of gold deposition at the northern deposit, MB01-N, and the southern deposit, MB01-S. Gold mineralisation at Mbe comprises high-grade, sulphide- and telluride-rich quartz veins, veinlets and breccias within wider envelopes of pervasive, lower-grade gold mineralisation.

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.

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.

Mineralisation at both deposits remains open in all directions and at depth. A step out drilling programme at MB01-S has recently been completed and all results from the 10-hole programme have been announced. An updated MRE is currently being prepared and is expected later in Q3-2026.