| OceanaGold Announces Ongoing Exploration Success at Haile 
 newswire.ca
 
 News provided by 				 					 						 							 								  							 						 						OceanaGold Corporation 							 								 									 								 							 							 						 						 					 				 				Sep 11, 2025, 07:00 ET
 
 VANCOUVER, BC, Sept. 11, 2025 /CNW/ - OceanaGold Corporation (TSX:  OGC)  (OTCQX: OCANF) ("OceanaGold" or the "Company") is pleased to announce  positive results from its exploration and resource conversion drilling  programs at the Haile Gold Mine ("Haile") in the United States.
 
 
 
 
 
 
 
 
   Figure 1: Schematic cross section (looking northeast) showing  Ledbetter mineralization with recent drill holes annotated. (CNW  Group/OceanaGold Corporation)
 
   Figure 2: Schematic long section (looking northwest) showing  Horseshoe mineralization with recent significant intercepts annotated.  (CNW Group/OceanaGold Corporation)
 
   Figure 3: Plan map showing 2025 drill hole locations. (CNW Group/OceanaGold Corporation)
 
 
 
 
 
 Gerard Bond, President and CEO of OceanaGold, said "With a record high exploration budget of $10 million  at Haile this year, we are delighted by the excellent return on  investment we continue to generate through exploration. These exciting  results continue to demonstrate the continuity of high-grade  mineralization at several deposits across the property, notably at  Ledbetter Phase 4, Horseshoe Underground, and the promising new  early-stage Pisces and Clydesdale  targets. The exploration success continues to highlight the exceptional  upside for low-risk organic growth we have within our existing portfolio  of assets."
 
 
 
 Drilling Highlights (core length):
 
 Ledbetter Phase 4 (conversion drilling)
 
 
 Horseshoe (conversion drilling)28.9 m @ 18.33 g/t Au (DDH1279)8.7 m @ 22.30 g/t Au (DDH1281)
 
 
 Pisces (Initial drilling, located 300 m south of Horseshoe)16.1 m @ 16.33 g/t Au (UGD0082)14.6 m @ 10.33 g/t Au (UGD0084)24.0 m @ 7.99 g/t Au (UGD0085)22.0 m @ 8.60 g/t Au (UGD0086)10.2 m @ 11.12 g/t Au (UGD0084)
 
 
 Clydesdale (initial drilling, located 100 m northwest of Palomino)7.6 m @ 10.39 g/t Au (DDH1271)6.6 m @ 3.34 g/t Au (DDH1290)
 
 
 Results can be viewed in 3D using VRIFY at the following link:26.2 m @ 4.11 g/t Au (DDH1282)
 
 edge.prnewswire.com
 
 VRIFY note: Drill results reflect only those set forth in OceanaGold's press release dated September 11, 2025, and do not include all historical drill results except those relevant to the current targets in this release.
 
 Ledbetter Phase 4 – High-Grade Results Targeting Underground Resource Conversion
 
 Mineralization  in Ledbetter Phase 4 is located within the current final phase of the  open pit Mineral Reserve (Figure 1). An ongoing resource conversion  drill program is enhancing resource confidence and providing samples for  metallurgical testing in support of the current trade-off study for the  evaluation of a potential underground mine at Ledbetter, which has  potential for improved overall site economics.
 
 A zone of  mineralization, down-dip of Ledbetter Phase 4 extension, has been tested  with a total of four holes, or 1,975 metres ("m"). The program has  returned results with strong mineralized intersections: 28.9 m @ 18.33 g/t Au from 489.1 m including 1.3 m @ 189.22 g/t (DDH1279), and 8.7 m @ 22.30 g/t Au from 375.9 m including 5.0 m @ 35.86 g/t (DDH1281).
 
 Horseshoe Underground – Support for Additional Resource Growth
 
 At Horseshoe Underground, drilling continues on both resource conversion and definition programs, totalling 7,467 m from 24 holes since the February 2025 news release. Conversion drilling totalling 4,261 m in 14 holes has targeted Inferred Mineral Resources in the lower levels of the deposit. Notable intercepts include: 16.1 m @ 16.33 g/t Au from 274.3 m (UGD0082) and 14.6 m @ 10.33 g/t from 235.6 m (UGD0084), 24.0 m @ 7.99 g/t from 258.6 m (UGD0085) and 22.0 m @ 8.60 g/t from 259.3 m (UGD0086); the latter three holes extending high-grade mineralization to the southwest.
 
 Definition drilling totalling 10 holes for 3,206 m  has targeted step-out opportunities, primarily south and west of the  current resource. Assay results for nine holes have been received with  the following significant intercepts: 7.6 m @ 3.63 g/t Au from 271.0 m and 9.1 m @ 3.40 g/t Au from 299.9 m (UGD0097) and 5.0 m @ 5.64 g/t Au from 267.9 m (UGD0100). The definition drill program is ongoing with 2,600 m  remaining to be drilled in 2025. These results demonstrate the  potential for continued resource growth, and drilling will remain  focused on further defining step-out targets to support future  underground development.
 
 Pisces – Initial Drilling of High-Grade Target
 
 The Pisces target is located along the prospective corridor between the Horseshoe and Palomino deposits at approximately 550 m below surface and close to existing and planned underground infrastructure.
 
 A total of nine holes for 6,167 m has been drilled in 2025, with the testing of geological and grade continuity. Significant intercepts include: 7.6 m @ 10.39 g/t Au from 647.0 m (DDH1271), 6.8 m @ 2.60 g/t Au from 571.0 m (DDH1285) and 6.6 m  @ 3.34 g/t Au (DDH1290), demonstrating continuity of mineralization in  the eastern area of the target towards Horseshoe. See the VRIFY link for  visual representation of the results.
 
 In conjunction with previously reported results, 44.2 m @ 10.85 g/t Au from 591 m (DDH1267), 9.4 m @ 44.14 g/t Au from 686.1 m (DDH1269) and 42.7 m @ 6.07 g/t Au from 560.2 m (DDH1257), (released February 24, 2025), the highest-grade mineralization defines a 150 m  strike length. This zone of higher-grade mineralization remains to be  further tested, while the target remains open to the northeast towards  Horseshoe and down-dip.
 
 Clydesdale – Successful Early-Stage Result
 
 The early-stage Clydesdale drill target is located 100 m northwest of Palomino and approximately 300 m stratigraphically lower at approximately 800 m  below surface. The target is defined by anomalous gold grades in wall  rock metasediments, anomalous pathfinder geochemistry, and alteration  mineralogy (Table 2). A total of two holes totalling 1,600 m have been drilled in 2025 to test the target. Initial results have returned one significant intercept of 26.2 m @ 4.11 g/t Au from 780.7 m including 14.6 m @ 6.21 g/t Au (DDH1282). See the VRIFY link for visual representation of the results.
 
 Follow-up drilling is ongoing with two additional holes to be completed by the end of the year for a total of 1,800 m.
 
 
 
 
                      | Table 1: Haile drill intersections subsequent to the February 24, 2025, drill results update. 
 
 |          | 
 |          | Hole ID 
 
 | From (m)
 
 
 | To (m)
 
 
 | Interval (m)
 
 
 | Au (g/t)
 
 
 | Target 
 
 | Activity 
 
 | 
 |          | DDH1278 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Conversion 
 
 | 
 |          | DDH1279 
 
 | 489.1 
 
 | 519.2 
 
 | 28.9 
 
 | 18.33 
 
 | Ledbetter 04 
 
 | Conversion 
 
 | 
 |          | Including 
 
 | 505.5 
 
 | 506.8 
 
 | 1.3 
 
 | 189.22 
 
 | Ledbetter 04 
 
 | Conversion 
 
 | 
 |          | DDW1280 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Conversion 
 
 | 
 |          | DDH1281 
 
 | 375.9 
 
 | 384.5 
 
 | 8.7 
 
 | 22.30 
 
 | Ledbetter 04 
 
 | Conversion 
 
 | 
 |          | Including 
 
 | 375.9 
 
 | 380.9 
 
 | 5.0 
 
 | 35.86 
 
 | Ledbetter 04 
 
 | Conversion 
 
 | 
 |          | UGD0079 
 
 | 197.2 
 
 | 206.4 
 
 | 9.1 
 
 | 2.49 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | And 
 
 | 275.5 
 
 | 276.9 
 
 | 1.4 
 
 | 12.14 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0080 
 
 | 207.6 
 
 | 213.5 
 
 | 5.9 
 
 | 3.56 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0081 
 
 | NSR 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0082 
 
 | 274.3 
 
 | 290.3 
 
 | 16.1 
 
 | 16.33 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0083 
 
 | NSR 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0084 
 
 | 235.6 
 
 | 250.2 
 
 | 14.6 
 
 | 10.33 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | Including 
 
 | 244.8 
 
 | 247.8 
 
 | 3.1 
 
 | 37.14 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | And 
 
 | 263.0 
 
 | 273.3 
 
 | 10.2 
 
 | 11.12 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0085 
 
 | 258.6 
 
 | 282.6 
 
 | 24.0 
 
 | 7.99 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0086 
 
 | 259.3 
 
 | 281.3 
 
 | 22.0 
 
 | 8.60 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0088 
 
 | 238.6 
 
 | 247.8 
 
 | 9.2 
 
 | 1.97 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0089 
 
 | 217.2 
 
 | 231.7 
 
 | 14.5 
 
 | 2.46 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | And 
 
 | 236.0 
 
 | 243.8 
 
 | 7.8 
 
 | 9.24 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | Including 
 
 | 242.7 
 
 | 243.4 
 
 | 0.7 
 
 | 42.60 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0090 
 
 | NSR 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0091 
 
 | NSR 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0092 
 
 | NSR 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0093 
 
 | NSR 
 
 | Horseshoe 
 
 | Conversion 
 
 | 
 |          | UGD0094 
 
 | NSR 
 
 | Horseshoe 
 
 | Definition 
 
 | 
 |          | UGD0095 
 
 | NSR 
 
 | Horseshoe 
 
 | Definition 
 
 | 
 |          | UGD0096 
 
 | NSR 
 
 | Horseshoe 
 
 | Definition 
 
 | 
 |          | UGD0097 
 
 | 271.0 
 
 | 278.6 
 
 | 7.6 
 
 | 3.63 
 
 | Horseshoe 
 
 | Definition 
 
 | 
 |          | And 
 
 | 299.9 
 
 | 309.1 
 
 | 9.1 
 
 | 3.40 
 
 | Horseshoe 
 
 | Definition 
 
 | 
 |          | UGD0098 
 
 | NSR 
 
 | Horseshoe 
 
 | Definition 
 
 | 
 |          | UGD0099 
 
 | NSR 
 
 | Horseshoe 
 
 | Definition 
 
 | 
 |          | UGD0100 
 
 | 267.9 
 
 | 272.9 
 
 | 5.0 
 
 | 5.64 
 
 | Horseshoe 
 
 | Definition 
 
 | 
 |          | UGD0101 
 
 | NSR 
 
 | Horseshoe 
 
 | Definition 
 
 | 
 |          | UGD0102 
 
 | NSR 
 
 | Horseshoe 
 
 | Definition 
 
 | 
 |          | UGD0103 
 
 | NSR 
 
 | Horseshoe 
 
 | Definition 
 
 | 
 |          | DDH1271 
 
 | 647.0 
 
 | 654.6 
 
 | 7.6 
 
 | 10.39 
 
 | Pisces 
 
 | Initial Drilling 
 
 | 
 |          | DDH1272 
 
 | 551.4 
 
 | 563.6 
 
 | 12.2 
 
 | 0.26 
 
 | Pisces 
 
 | Initial Drilling 
 
 | 
 |          | DDH1274 
 
 | 607.5 
 
 | 609.0 
 
 | 1.5 
 
 | 3.21 
 
 | Pisces 
 
 | Initial Drilling 
 
 | 
 |          | DDH1277 
 
 | 599.4 
 
 | 600.8 
 
 | 1.4 
 
 | 1.02 
 
 | Pisces 
 
 | Initial Drilling 
 
 | 
 |          | DDH1285 
 
 | 522.3 
 
 | 529.8 
 
 | 7.5 
 
 | 1.79 
 
 | Pisces 
 
 | Initial Drilling 
 
 | 
 |          | And 
 
 | 571.0 
 
 | 577.8 
 
 | 6.8 
 
 | 2.60 
 
 | Pisces 
 
 | Initial Drilling 
 
 | 
 |          | DDH1286 
 
 | 627.7 
 
 | 632.0 
 
 | 4.3 
 
 | 0.57 
 
 | Pisces 
 
 | Initial Drilling 
 
 | 
 |          | DDH1290 
 
 | 642.4 
 
 | 648.9 
 
 | 6.6 
 
 | 3.34 
 
 | Pisces 
 
 | Initial Drilling 
 
 | 
 |          | DDH1293 
 
 | 536.2 
 
 | 543.4 
 
 | 7.2 
 
 | 2.56 
 
 | Pisces 
 
 | Initial Drilling 
 
 | 
 |          | UGD0109 
 
 | 413.0 
 
 | 431.3 
 
 | 18.3 
 
 | 0.22 
 
 | Pisces 
 
 | Initial Drilling 
 
 | 
 |          | DDH1276 
 
 | 400.5 
 
 | 406.6 
 
 | 6.1 
 
 | 2.30 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 | 
 |          | DDH1282 
 
 | 768.6 
 
 | 772.4 
 
 | 3.8 
 
 | 5.27 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 | 
 |          | DDH1282 
 
 | 780.7 
 
 | 806.9 
 
 | 26.2 
 
 | 4.11 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 | 
 |          | Including 
 
 | 792.2 
 
 | 806.9 
 
 | 14.6 
 
 | 6.21 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 | 
 |          | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 |  
 
 Notes:
 
 
 Intervals are core length, not true width."Initial  Drilling" intercepts are associated with early-stage exploration  drilling, "Definition" drilling intercepts are intercepts outside the  current resource model shell directed at defining mineralization to an  Inferred Resource category and "Conversion" drilling are intercepts  converting Inferred Resources to Indicated Resources category. NSR = No  Significant Result.
 
 
 
                      | Table 2: Historical and OGC Haile drill intersections relevant to the Ledbetter 04, Pisces, and Clydesdale target areas. 
 
 |          | 
 |          | Hole ID 
 
 | From (m)
 
 
 | To (m)
 
 
 | Interval (m)
 
 
 | Au (g/t)
 
 
 | Target 
 
 | Activity 
 
 |          | DDH0436 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH0439 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH0450 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH0451 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH0461 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH0632^ 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH0638^ 
 
 | 469.2 
 
 | 478.9 
 
 | 9.8 
 
 | 2.42 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH0646^ 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH0653^* 
 
 | 465.8 
 
 | 478.1 
 
 | 12.3 
 
 | 1.82 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH0686^ 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH0841^ 
 
 | 401.4 
 
 | 407.5 
 
 | 6.1 
 
 | 3.81 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH1201^ 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Advanced Drilling 
 
 |          | DDH1207^ 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Advanced Drilling 
 
 |          | DDH1208^ 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Advanced Drilling 
 
 |          | DDH1213^ 
 
 | 468.3 
 
 | 481.8 
 
 | 13.5 
 
 | 2.95 
 
 | Ledbetter 04 
 
 | Advanced Drilling 
 
 |          | DDH1252^ 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Conversion 
 
 |          | DDH1253^ 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Conversion 
 
 |          | DDH1255^ 
 
 | 431.9 
 
 | 443.8 
 
 | 11.9 
 
 | 2.88 
 
 | Ledbetter 04 
 
 | Conversion 
 
 |          | DDH1256^ 
 
 | 431.5 
 
 | 438.2 
 
 | 6.7 
 
 | 2.63 
 
 | Ledbetter 04 
 
 | Conversion 
 
 |          | DDH1260^ 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Conversion 
 
 |          | RC2002 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RC2019 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RC2058 
 
 | 441.9 
 
 | 461.8 
 
 | 19.8 
 
 | 5.27 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RC2064 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RC2067 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RC2108 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RCT0050 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RCT0067 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RCT0068 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RCT0088 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RCT0134 
 
 | 432.8 
 
 | 445.0 
 
 | 12.2 
 
 | 2.16 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RCT0149 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RCT0161 
 
 | 428.5 
 
 | 441.9 
 
 | 13.5 
 
 | 42.40 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | Including 
 
 | 429.8 
 
 | 431.3 
 
 | 1.5 
 
 | 318.52 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RCT0167 
 
 | 410.7 
 
 | 441.9 
 
 | 31.2 
 
 | 4.85 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RCT0203 
 
 | NSR 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | RCT0204 
 
 | 438.9 
 
 | 445.0 
 
 | 6.1 
 
 | 4.51 
 
 | Ledbetter 04 
 
 | Initial Drilling 
 
 |          | DDH0599^ 
 
 | NSR 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | DDH0636^ 
 
 | 545.4 
 
 | 550.9 
 
 | 5.5 
 
 | 2.81 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | And 
 
 | 597.9 
 
 | 611.6 
 
 | 13.7 
 
 | 2.31 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | DDH1067^ 
 
 | NSR 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | DDH1204^ 
 
 | NSR 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | DDH1245^ 
 
 | NSR 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | DDH1247^** 
 
 | NSR 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | RCT0012 
 
 | 356.6 
 
 | 358.1 
 
 | 1.5 
 
 | 9.10 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | And 
 
 | 399.3 
 
 | 413.0 
 
 | 13.7 
 
 | 3.24 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | RCT0028 
 
 | NSR 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | RCT0077 
 
 | NSR 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | RCT0080 
 
 | 144.8 
 
 | 152.4 
 
 | 7.6 
 
 | 2.21 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | And 
 
 | 193.6 
 
 | 202.7 
 
 | 9.1 
 
 | 3.89 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | And 
 
 | 251.8 
 
 | 262.1 
 
 | 10.4 
 
 | 4.31 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | RCT0091 
 
 | 528.8 
 
 | 538.0 
 
 | 9.1 
 
 | 5.61 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | RCT0146 
 
 | NSR 
 
 | Pisces 
 
 | Initial Drilling 
 
 |          | DDH1177^ 
 
 | 527.7 
 
 | 535.2 
 
 | 7.5 
 
 | 3.65 
 
 | Palomino 
 
 | Initial Drilling 
 
 |          | RCT0051 
 
 | 510.5 
 
 | 521.4 
 
 | 10.9 
 
 | 1.65 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | And 
 
 | 634.0 
 
 | 649.8 
 
 | 15.9 
 
 | 1.90 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | And 
 
 | 713.2 
 
 | 725.4 
 
 | 12.2 
 
 | 3.16 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | RCT0110 
 
 | 269.8 
 
 | 281.9 
 
 | 12.2 
 
 | 1.89 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | And 
 
 | 507.2 
 
 | 511.9 
 
 | 4.7 
 
 | 3.33 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | And 
 
 | 526.8 
 
 | 538.0 
 
 | 11.2 
 
 | 3.41 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | And 
 
 | 774.2 
 
 | 780.3 
 
 | 6.1 
 
 | 3.39 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | And 
 
 | 823.0 
 
 | 827.5 
 
 | 4.6 
 
 | 5.36 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | RCT0117 
 
 | 502.9 
 
 | 509.0 
 
 | 6.1 
 
 | 2.22 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | And 
 
 | 600.5 
 
 | 614.2 
 
 | 13.7 
 
 | 3.35 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | And 
 
 | 641.6 
 
 | 649.2 
 
 | 7.6 
 
 | 1.66 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | And 
 
 | 688.9 
 
 | 693.4 
 
 | 4.6 
 
 | 4.70 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |          | RCT0118 
 
 | 519.6 
 
 | 527.3 
 
 | 7.7 
 
 | 2.37 
 
 | Clydesdale 
 
 | Initial Drilling 
 
 |  
 
 Notes:
 
 
 For further information relating to drill hole data please refer to the Company's website at edge.prnewswire.com.Intervals are core length, not true width."Initial Drilling" intercepts are associated with early-stage  exploration drilling, while "Conversion" drilling are intercepts  converting Inferred Resources to Indicated Resources category. NSR = No  Significant Result. All data, apart from holes marked "^"represent  historical drilling conducted by Romarco Minerals prior to OceanaGold's  ownership of Haile"^" represents OceanaGold holes."*" represents drill hole results reported by OceanaGold in its press release dated November 8, 2017."**" represents drill hole results reported by OceanaGold in its press release dated February 24, 2025.All historical drill data collected by Romarco Minerals are  considered historical in nature and based on prior data and reports  prepared by Romarco Minerals. A qualified person from the Company has  not undertaken independent investigation of the sampling nor has it  independently analyzed the results of the historical drilling to verify  the results. OceanaGold is not treating the historical data as current.  There can be no assurance that any of the historical drill data is  representative.
 
 About OceanaGold
 
 OceanaGold  is a growing intermediate gold and copper producer committed to safely  and responsibly maximizing the generation of Free Cash Flow from our  operations and delivering strong returns for our shareholders. We have a  portfolio of four operating mines: the Haile Gold Mine in the United States of America; the Didipio Mine in the Philippines; and the Macraes and Waihi operations in New Zealand.
 
 Qualified Person Statement
 
 The  scientific and technical information relating to the Haile exploration  results contained in this press release has been reviewed and approved  by Craig Feebrey, a Member of the Australasian Institute of Mining and  Metallurgy and a qualified person under National Instrument 43-101 –  Standards of Disclosure for Mineral Projects of the Canadian Securities  Administrators ("NI 43-101"). Mr. Feebrey is the Executive Vice  President and Chief Exploration Officer of OceanaGold.
 
 Quality Assurance and Quality Control ("QA/QC")
 
 From July 2017 to 2025 almost all Haile exploration core samples have been prepared at the ALS lab in Tucson, Arizona, and analyzed at the ALS lab in Reno, Nevada,  each of which is independent from OceanaGold. Select resource  conversion core samples were also prepared and analyzed at the SGS lab  in Kershaw, South Carolina in 2025 which is also independent from  OceanaGold, with confirmation pulp duplicates sent to the ALS lab  in Reno, Nevada. Samples are pulverized  from a 250g (ALS) or 450g (SGS) sample to 85% passing 75 mesh.  Approximately 225g of pulp sample is used for fire assay. Assays are  based on a 30g fire assay aliquot for gold with Atomic Absorption  finish. If the gold value from Atomic Absorption is >10g/t, an  additional 30g of pulp sample is fire assayed for gold using a  gravimetric finish. Some holes are composited and analyzed for carbon,  sulphur and multi-elements using LECO and ICP-OES methods. Both ALS and  SGS labs used for OceanaGold samples are ISO 17025 certified.
 
 Blanks  and standards are each inserted every 20th sample. Precision and  accuracy of certified reference materials ("CRMs") compared to expected  values have been consistently within 5% RSD and often within 3%. Barren  marble and sand are inserted as blanks every 20th sample. CRMs from  RockLabs and OREAS are inserted every 20th sample (5%). All blanks and  CRMs are handled by the OceanaGold Geology Team and are stored in the  locked OceanaGold office.
 
 All drill hole samples are handled and  transported from the drill rigs to the secured Haile Exploration  warehouse by OceanaGold personnel or contractors. Access to the property  is controlled by locked doors and cameras monitored by OceanaGold  security. The main gate requires an electronic employee badge to enter.  Samples are packaged at the Haile Exploration warehouse by OceanaGold  geologists and geotechnicians. Samples are trucked in sealed plastic  barrels by certified couriers with submittal forms that are verified  during sample pick-up and delivery to ALS. No sample shipments have been  recorded as missing or tampered with.
 
 Technical Report
 
 For further information, please refer to the following NI 43-101 technical report available on the SEDAR+ website at  www.sedarplus.com under the Company's profile or on the Company's website at  www.oceanagold.com: "NI 43-101 Technical Report Haile Gold Mine Lancaster County, South Carolina" dated March 28, 2024, with an effective date of December 31, 2023, prepared by D. Carr, D, Londoño, J. Moore and B. Drury (OceanaGold); L. Standridge and R. Cook (Call & Nicholas, Inc.); J.N. Janney-Moore and W.L. Kingston (NewFields Mining & Technical Services LLC); and M. Sullivan and B. Miller Clarkson (SRK Consulting (U.S.), Inc.).
 
 Cautionary Statement for Public Release
 
 This  press release contains certain "forward-looking statements" and  "forward-looking information" (collectively, "forward-looking  statements") within the meaning of applicable Canadian securities laws  which may include, but is not limited to, statements with respect to the  estimation of Mineral Reserves and Resources, potential Mineral  Reserves and Resources growth, the realization of Mineral Reserves and  Resources estimates, costs and timing of the development of new deposits  and, costs and timing of future exploration and drilling programs.  Forward-looking statements and information relate to future performance  and reflect the Company's expectations regarding the generation of Free  Cash Flow, execution of business strategy, future growth, future  production, estimated costs, results of operations, business prospects  and opportunities of OceanaGold and its related subsidiaries. Any  statements that express or involve discussions with respect to  predictions, expectations, beliefs, plans, projections, objectives,  assumptions or future events or performance (often, but not always,  using words or phrases such as "expects" or "does not expect", "is  expected", "anticipates" or "does not anticipate", "plans", "estimates"  or "intends", or stating that certain actions, events or results "may",  "could", "would", "might" or "will" be taken, occur or be achieved) are  not statements of historical fact and may be forward-looking statements.  Forward-looking statements are subject to a variety of risks and  uncertainties which could cause actual events or results to differ  materially from those expressed in the forward-looking. They include,  among others, those risk factors identified in the Company's most recent  Annual Information Form prepared and filed with securities regulators  which is available on SEDAR+ at  www.sedarplus.com  under the Company's name and on the Company's website. There are no  assurances the Company can fulfil forward-looking statements. Such  forward-looking statements are only predictions based on current  information available to management as of the date that such predictions  are made; actual events or results may differ materially as a result of  risks facing the Company, some of which are beyond the Company's  control. Although the Company believes that any forward-looking  statements contained in this press release is based on reasonable  assumptions, readers cannot be assured that actual outcomes or results  will be consistent with such statements. Accordingly, readers should not  place undue reliance on forward-looking statements. The Company  expressly disclaims any intention or obligation to update or revise any  forward-looking statements and information, whether as a result of new  information, events or otherwise, except as required by applicable  securities laws.
 
 SOURCE OceanaGold Corporation
 
 
  For further information please contact: Investor Relations, Haley Mayers, VP, Investor Relations, Tel: +1 604-678-4097, ir@oceanagold.com; Valerie Burns, Manager, Investor Relations, Tel: +1 604-235-0742, ir@oceanagold.com; Media Relations, Louise Burgess, VP, Communications, Tel: +1 604-403-2019, media@oceanagold.com 
 
 
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