Announcement • May 13

Oceanagold Corporation Announces Additional High-Grade Drill Results At Haile

OceanaGold Corporation announced high-grade results from its ongoing exploration and resource conversion drilling program at the Haile Gold Mine in the United States. Drilling Highlights (core length): Horseshoe Underground (conversion and extension drilling): 15.5 m @ 30.64 g/t Au (UGD0121), 30.5 m @ 13.86 g/t Au (UGD0113), 22.5 m @ 13.42 g/t Au (UGD0122), 18.4 m @ 9.62 g/t Au (UGD0119), 21.9 m @ 6.48 g/t Au including 3.7 m @ 23.55 g/t Au (UGD0120), 26.3 m @ 3.41 g/t Au and 44.3 m @ 3.72 g/t Au (UGD0107). Ledbetter Underground (conversion drilling): 27.9 m @ 8.60 g/t Au (DDH1313), 27.9 m @ 4.16 g/t Au (DDH1319), 18.4 m @ 3.68 g/t Au (DDH1317), 13.0 m @ 2.25 g/t Au and 17.1 m @ 8.20 g/t Au (DDH1283), 2.6 m @ 9.63 g/t Au and 3.3 m @ 40.45 g/t Au (DDH1315). Clydesdale (initial drilling): 14.5 m @ 15.81 g/t Au including 4.5 m @ 41.6 g/t Au (DDH1305). Drill results can be viewed in 3D using VRIFY at the following link. VRIFY note: Drill results reflect only those set forth in OceanaGold's press release dated May 12, 2026, and do not include all historical drill results except those relevant to the current targets in this release. The Horseshoe Underground has defined Mineral Reserves as well as three discrete zones of mineralization to the southwest (Horseshoe extensions), known as the upper (surface to 900mRL), middle (900mRl to 730mRL) and lower (below 730mRL) zones. Notably, all three of these zones are near both existing and planned underground development infrastructure. Success from the 2025 exploration program added Inferred Mineral Resources to the upper zone for the first time, while also expanding the Inferred Mineral Resources in the middle and lower zones. On the main Horseshoe orebody, the 2025 resource estimate resulted in conversion of Inferred to Indicated Mineral Resources in the lower mineralized zones. The 2026 drill program focuses on both resource conversion and extension of the main Horseshoe orebody and the three zones at Horseshoe extensions. At Horseshoe extensions, drilling totalling 14 holes for 4,372 m has targeted both conversion and extension opportunities. In the upper zone, the results of two holes - 15.5 m @ 30.64 g/t Au (UGD0121) and 18.4 m @ 9.62 g/t Au (UGD0119), confirm the continuity of the mineralization. Results from two extension holes in the upper zone - 21.9 m @ 6.48 g/t Au including 3.7 m @ 23.55 g/t Au (UGD0120) and 22.5 m @ 13.42 g/t Au (UGD0122), support expansion of the known mineralization in the area. Significant results between the middle and lower zones include 25.8 m @ 3.63 g/t Au (UGD0126) and 16.4 m @ 4.11 g/t Au (UGD0104), extending known mineralization to the west. Extensional drilling at the bottom of the lower zone returned 26.3 m @ 3.41 g/t Au and 44.3 m @ 3.72 g/t (UGD0107), adding mineralization at depth outside of the known resource. The lower zone remains open in multiple directions with additional follow-up drilling planned in this area. Since the last resource estimate, conversion drilling totalling 1,258 m in 4 holes has continued to target conversion of Inferred Mineral Resources in the lower levels of the main Horseshoe orebody. Notable intercepts include: 12.2 m @ 24.14 g/t Au (UGD0112); and 30.5 m @ 13.86 g/t Au (UGD0113). These results are in-line with the resource model and are expected to be included the next reserve update. The Company announced in February 2026 a change in the mining method for the final pit phase of Ledbetter to an underground mining mine. This has expanded the exploration opportunity at Ledbetter, as mineralization outside the prior pit shell is now potentially economic. In 2025, the Company began a drill program targeting known mineralization with the goal of converting Inferred Mineral Resources and increasing confidence down plunge of the existing reserve in an area referred to as Lobe 3. Eight holes have been drilled since the Company's news release dated September 11, 2025, with new drilling totalling 4,306 m. The highlight of the Ledbetter drilling is 27.9 m @ 4.16 g/t Au (DDH1319) in Lobe 3, which has infilled a gap in known resources, demonstrating continuity of high-grade mineralization. To the northeast, holes DDH1315 and DDH1317 targeted the conversion of Inferred Mineral Resources and returned higher grades than the model predicted, including a result of 18.44 m @ 3.68 g/t Au (DDH1317). The Clydesdale target is located 100 m northwest of Palomino and approximately 300 m stratigraphically lower at approximately 800 m below surface. Drilling continues at Clydesdale with early-stage exploration results now reporting a second mineralized intercept showing good width and grade of 14.5 m @ 15.81 g/t Au (DDH1305). The Company has now defined two mineralized intercepts in this area (DDH1282, 6.2 m @ 4.11 g/t Au, previously reported), with additional drilling ongoing to further define the potential of this new mineralized zone. The Pisces target is located along the corridor between the Horseshoe and Palomino deposits at approximately 550 m below surface and close to existing and planned underground infrastructure. Drilling at Pisces is ongoing, with ~6,500 m planned. The work is focused on further understanding the distribution of the high-grade mineralization in the area. There are approximately 34,500 m of drilling planned at Haile for 2026 from both surface and underground. Drilling will continue to focus on resource conversion at Horseshoe Underground, including targeting expansions of the upper, middle and lower zones to the southwest. At Ledbetter Underground, drilling will continue to infill and test extensions to Lobe 3. Clydesdale and Pisces drilling will also continue from surface through the year, with the ability to accelerate the program once the Palomino decline is in place, providing access to new drill locations at shorter distances. Results from recent drilling and ongoing refinement of the geologic model have resulted in a better understanding on the structural controls on mineralization, allowing for the systematic generation of targets to be explored in the coming years.

Announcement • Apr 04

OceanaGold Corporation Drills Multiple Ore-Grade Intercepts At Horseshoe Extension At Haile and Extends Mineralization At Depth At Didipio

OceanaGold Corporation provide results from exploration and resource conversion drilling for Haile and Didipio. Haile drill highlights include (core length): 34.9 m @ 7.6 g/t Au, Horseshoe (UGD0026 - conversion) 39.3 m @ 5.8 g/t Au, Horseshoe Extension (UGD0044 - extensional) 34.4 m @ 4.6 g/t Au, Horseshoe Extension (UGD0026 - extensional) 34.3 m @ 4.3 g/t Au, Horseshoe Extension (UGD0035 - extensional) Didipio drill highlights include (core length): 103 m @ 2.02 g/t AuEq, Eastern Monzonite (RDUG515 - conversion) 91 m @ 2.24 g/t AuEq, Eastern Monzonite (RDUG517 – conversion) 72 m @ 2.28 g/t AuEq, Eastern Monzonite (RDUG518 – conversion) 87m @ 1.43 g/t AuEq, Eastern Monzonite (RDUG522 – extensional) 66 m @ 1.76 g/t AuEq, Feldspar Porphyry (RDUG625A – extensional) 35 m @ 1.06 g/t AuEq, Northern Balut (RDUG523 – extensional) Haile Exploration Update Resource conversion and extensional drilling from Horseshoe Underground continues with 2,142 metres completed of a planned 10,605 metres this year. The results from 8 holes drilled at Horseshoe Extension target and lower Horseshoe at the end of 2023 and the beginning of 2024 have been received. Highlights from this drilling include 34.9 m @ 7.60 g/t Au from hole UGD0026 targeting conversion of the lower Horseshoe Inferred resource (result received after data cut-off for 2023 end of year Reserve and Resource model update) and 39.3 m @ 5.8 g/t Au from hole UGD0044, among others, targeting resource growth at Horseshoe Extension. Horseshoe Extension is a zone of mineralization located approximately 200 metres southwest of the Horseshoe orebody with similar plunge on the southern limb of the northeastern striking antiform. Mineralization is of the same character as Horseshoe, occurring along a mineralized metasediment/metavolcanic contact. Continuity of the lower Horseshoe Extension mineralization is confirmed. Drilling in 2024 will continue to target the Horseshoe Extension as more optimal drill locations become available with more underground development and will also target infill drilling of inferred mineralization at lower Horseshoe. Inclusive of Reserves Based on reported Reserves and Resources for the year ended 2023 Didipio Exploration Update Since the February 2, 2024 news release 6,763 metres of extensional and resource conversion drilling in twenty-three holes has been completed from Didipio underground. Extensional Drilling Extensional drilling has been achieved by extending resource conversion drill holes beyond the resource shell to the north, northeast, and at depth to approximately 1,700 mRL; extending mineralisation approximately 750 metres below the bottom of the open pit. Extensional drilling has focused on (a) depth extension of Balut Dyke mineralization on the northern side of the Syenite Porphyry and (b) depth extension of mineralization within the Monzonite in Panel 4. Extensional hole RDUG522 was completed to follow up on the previous success of hole RDUG611 (72 m @ 3.40 g/t AuEq) reported in August 2023 which has opened up a lower zone of mineralization to the north and at a depth of 1,900 mRL and below. An intercept returning 87 m @ 1.43 g/t AuEq (RDUG522) has confirmed mineralization extends for over 150 metres further below RDUG611 down to 1,710mRL, opening up a zone of 200 metres vertical extent below the reported Inferred resource. Further drilling will be undertaken in 2024 to define the extent of this new mineralization zone. Hole RDUG523 returned a result of 35 m @ 1.06 g/t AuEq and confirmed a 70 m vertical continuation of the recently identified Balut Dyke on the northern side of the Syenite with similar thickness below previously reported RDUG500 with 45.4 m @ 2.51 g/t AuEq. Mineralization of the Balut on the north remains open along strike and at depth while its analogue defined at a higher elevation on the south also remains open at depth and to be tested to a similar elevation (i.e. 1,900mRL). In addition, hole RDUG627 has identified an additional zone of mineralization further east intersecting 15 m @ 3.32 g/t AuEq associated with another Feldspar Porphyry. The recent discovery of three new mineralized intrusives in the east highlights the prospectivity that remains for further mineralized areas. Resource Conversion Drilling Resource Conversion drilling has focused on (i) conversion of the inferred resource within the Monzonite Porphyry directly east of the Syenite Porphyry within Panel 3, and (ii) infill drilling of the mineralized Eastern Breccia and Feldspar Porphyry in the east. These drill programs broadly confirm and provide improved confidence in the inferred grade estimates as calculated in the end of year 2023 annual resource and reserve model. Follow-up drilling on two mineralized intrusives discovered in 2022 (Eastern Breccia and Feldspar Porphyry) demonstrates continuity of mineralization with both zones remaining open at depth and potentially expanding the mineralized Feldspar Porphyry. Hole RDUG625A has confirmed the continuity of mineralization within the Feldspar Porphyry while holes RDUG626 and RDUG623 appear to have closed off this mineralization to the east. Napartan Exploration Update Regional exploration in 2024 includes advancing the Napartan initial drill target, 9 km north-west of the Didipio mine. Surface mapping and sampling has identified a Cu-Au mineralised pegmatite similar in nature to the Balut Dyke and an important ores source at Didipio. Drilling at Napartan began on March 15, 2024, with one drill rig mobilized. Two holes have now been completed of a 2,500 m program budgeted for 2024, with assay results pending.

Interest coverage ratio	703.3x
Cash	US$620.10m
Equity	US$2.49b
Total liabilities	US$979.50m
Total assets	US$3.47b

Data	Last Updated (UTC time)
Company Analysis	2026/06/12 16:59
End of Day Share Price	2026/06/12 00:00
Earnings	2026/03/31
Annual Earnings	2025/12/31

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

Analyst	Institution
Richard Gray	ATB Cormark
Matthew Murphy	Barclays
Brian Quast	BMO Capital Markets Equity Research

OceanaGold Balance Sheet Health

Financial Health criteria checks 6/6

Key information

Recent financial health updates

Recent updates

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