OceanaGold Submits Permit Application and Provides Technical and Exploration Update Supporting Mine Life Extension at Macraes VANCOUVER, BC – OceanaGold Corporation (TSX: OGC, NYSE: OGC) (“OceanaGold” or the “Company”) announces that it has lodged its application for approval of the Macraes Phase 4
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NEWS RELEASE
September 9, 2026
OceanaGold Submits Permit Application and Provides Technical and
Exploration Update Supporting Mine Life Extension at Macraes
VANCOUVER, BC – OceanaGold Corporation (TSX: OGC, NYSE: OGC) (“OceanaGold” or the “Company”)
announces that it has lodged its application for approval of the Macraes Phase 4 Project (“MP4”) under
New Zealand’s Fast -track Approvals Act 2024. The MP4 application seeks to extend the mine life at
Macraes from the current reserve life of 2032 to the late 2030s, consistent with Macraes’ history of mine
life extension since it commenced operation in 1990.
The Company also provides details on the technical study work and exploration results which support the
potential to extend mine life at Macraes via MP4 and beyond.
Gerard Bond, President and CEO of OceanaGold, said “Submitting the MP4 application is an important
step in securing the long-term future of Macraes through permitting of additional open pit cutbacks and a
mine life extension to the late 2030s. Recent drilling supports both the extensions included in MP4 and
identifies further opportunities to potentially enable meaningful gold production into the 2040s.
For 36 years Macraes has safely and responsibly produced gold, delivering multi-generational benefits to
the surrounding communities and to New Zealand through sustaining many hundreds of jobs, socio -
economic community contributions, taxes and royalties, and export earnings. Our permit application and
exploration results show the potential for Macraes to continue its long history of value creation while
generating strong returns for our stakeholders.”
For a visual overview of the site, mine life extension opportunities and drill results, please see the
accompanying 3D video:
https://vrify.com/meetings/recordings/70c5ee50-9ecc-4e81-a222-7d7449da6ec8
VRIFY note: Drill results reflect only those set forth in OceanaGold’s press release dated September 9, 202 6, and do not include all
historical drill results except those relevant to the current targets in this release.
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Macraes Overview
Macraes is located on the South Island of New Zealand, approximately 60 kilometres (“km”) northwest of
Dunedin. Production at Macraes commenced in 1990, with an initial 7-year mine life. In July of this year,
the mine celebrated the production of its 6 millionth ounce of gold over its 3 6-year operating history.
Macraes has a geologically prospective land package of over 14,000 hectares, including a 30 km highly
mineralized structure known as the Macraes Shear Zone which hosts multiple gold deposits and
exploration targets (Figure 1).
Figure 1: Macraes Property Overview
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Macraes Mine Life Extension Potential
MP4 Fast-track Application
On September 9, 2026, the Company lodged its Fast-track application for the MP4 project. The MP4
application includes:
• permitting for all activities required to complete the current reserve mine plan;
• the development of Southern Pit Innes Mills (“SPIM” , details below);
• extensions of the Golden Point Underground (“GPUG”); and
• flexibility to incorporate additional Mineral Resources into the future production profile.
Approval of MP4 will enable the extension of the Macraes operation to the late 2030s. Under the “one-
stop shop” process of the New Zealand government, the Company expects MP4 to be fully permitted by
mid-2027 (subject to appeals ). MP4 permit approval is necessary for mine life extension, subject to
achieving other ancillary permits, satisfactory technical and financial reviews, and market and operating
conditions.
Approval and subsequent execution of MP4 works will enable the Macraes operation to continue to have
a strong positive impact on the Otago region and New Zealand more broadly for many more years, bringing
substantial investment, maintaining current and future employment opportunities and continuing to
provide meaningful social, environmental and economic benefits.
The Company is familiar with the Fast-track approval process, having successfully permitted the Waihi
North Project in 2025.
Mine Life Extension Technical Studies
The approval of MP4 will enable the Company to proceed with extensions to the Innes Mills, Coronation,
Coronation North and Golden Bar open pits . A mine life extension of Golden Point Underground is also
included in MP4, to provide additional flexibility for future development.
MP4 also includes an extension to the north of the current Innes Mills open pit, referred to as SPIM.
Advanced studies are underway to bring SPIM into Mineral Resources by year end 2026 , supported by
drilling completed in prior years.
The Company believes that SPIM has the capability to contribute meaningful production at Macraes from
2032. Together with the extension of the Golden Point Underground, the Company is targeting to maintain
production at Macraes above 100,000 ounces per year into the late 2030s.
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Details regarding Macraes’ expected production profile , development timeline for SPIM , capital
expenditures and overall economics will be included in an updated National Instrument – 43-101
Standards of Disclosure for Mineral Projects (“NI 43-101”) technical report that is expected to be released
in early 2028.
SPIM development capital will include waste stripping, rehandling and relocation of a portion of historic
tailings into the current Frasers tailings storage facility, relocation of the open pit workshop, re-routing the
public road, and upgrades to site power infrastructure.
Advancing SPIM also has the benefit of enhancing the feasibility of mining the Round Hill deposit which
was previously removed from Mineral Resources at year-end 2023. The Round Hill deposit is not included
in MP4 and represents a potential opportunity for mine life extension into the 2040s.
Macraes Exploration Overview
The 2026 exploration program at Macraes is focused on supporting the mine life extensions outlined in
MP4 and beyond. Supported by a record expected expenditure of US$13 million in 2026, a total of 60,000
metres (“m”) of drilling is being executed at Macraes. The Innes Mills, Coronation and Nunns open pits,
together with Golden Point Underground , continue to show signifi cant potential for further resource
conversion and growth.
Macraes Drill Results
Innes Mills
Innes Mills has been the main open pit ore source since 2024, accounting for approximately 39% of total
Measured and Indicated Mineral Resource ounces for Macraes as at December 31, 2025 . Drilling since
the last resource estimate has focused on conversion of Inferred Mineral Resources in, and down dip of,
the current reserve open pit design, with more than 12,000 m across 48 holes completed (Table 1). Drill
hole DDH8224 returned 25.0 m @ 0. 8 g/t gold (“Au”), confirming that mineralization continues at least
150 m down dip, towards the east, beyond the Innes Mills current reserve open pit design (Figure 2). This
area is a target for additional resource expansion drilling in the remainder of th is year to confirm the
economic feasibility of additional future open pit cutbacks.
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Figure 2: Innes Mills cross section (looking north-northwest) highlighting recent significant intercept DDH8224 in relation
to the Innes Mills current reserve open pit design.
Golden Point Underground (GPUG)
GPUG is located immediately down dip of the historic Golden Point and Round Hill open pits which were
mined between 1990 and 2002 and produced approximately 1.3 million ounces of gold . Underground
mining at GPUG commenced in 2021.
Since the last resource estimate for the year ended December 31, 2025 , more than 13,000 m of drilling
across 37 holes has been completed, targeting both conversion and extension opportunities (Table 1).
In the north, DDH8281 stepped out approximately 40 m down dip of the current mine plan, intercepting
12.0 m @ 2.1 g/t Au and confirming the continuation of economic mineralization down -plunge. In the
south, a 40 m step-out from the existing mine plan reported 15.0 m @ 1.5 g/t Au (DDH8412). These results
are well above the current underground reserve cut-off grade and support the potential for future resource
and reserve growth to the east and southeast (Figure 3). Drilling will continue at GPUG for the remainder
of the year, targeting extension to mineralization both down dip and to the south along strike, where the
deposit remains open, to further grow the resource.
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Figure 3: Plan view map of GPUG highlighting recent significant intercepts DDH8281 and DDH8412 located outside the
current underground design.
Coronation
The Coronation open pit is located approximately 5 km to the northeast of the processing plant. Since the
last resource estimate, more than 6,000 m of drilling across 36 holes has been completed at Coronation,
with a focus on the conversion of Inferred Mineral Resources (Table 1).
Notable results included 7.9 m @ 5.4 g/t Au (DDH8286), 12.0 m @ 2.3 g/t Au (DDH8298), 21.0 m @ 1.1 g/t
Au (DDH8283) and 6.0 m @ 1.7 g/t Au (DDH8367), which support the emergence of a higher-grade zone
plunging to the southeast (Figure 4). This area remains open to the southeast , with further exploration
drilling planned to pursue extension of this higher-grade trend beyond the current pit design to support
future pit cutbacks.
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Figure 4: Coronation cross section (looking northeast) highlighting recent significant intercepts
DDH8298, DDH8286 and DDH8283, in relation to the Coronation current reserve open pit design.
Nunns
The Nunns prospect , containing a small resource defined in 2017, is located at the northwestern end
of the Macraes property, approximately 6 km along strike from Coronation . Following the Company’s
additional land purchase in early 2026, a drill program focused on converting and growing the existing
Mineral Resources, with 4,250 m of drilling across 48 drill holes was completed (Table 1). Notable results
included 14.0 m @ 2.5 g/t Au (RCH8374), 8.0 m @ 4.2 g/t Au (RCH8375) and 4.0 m @ 7.9 g/t Au (RCH8344),
confirming the extension of mineralization down dip and along strike, outside of the known resource (refer
to VRIFY).
The mineralization at Nunns represents a potentially low capital, future open pit ore source for Macraes,
that is outside of the MP4 permit application. An updated resource estimate is expected to be included at
the end of 2026.
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Table 1: Select Macraes significant drill intersections since the 2025 resource estimate1
Drill Hole ID* From (m) To (m) Interval
(m)* Au (g/t) Area Activity*
DDH8273 171.2 181.2 10.0 1.0 Coronation Extension
DDH8283 162.2 183.2 21.0 1.1 Coronation Conversion
DDH8286 150.1 158.0 7.9 5.4 Coronation Conversion
DDH8298 145.2 157.2 12.0 2.3 Coronation Conversion
DDH8309 135.0 140.0 5.0 2.3 Coronation Conversion
DDH8327 116.1 122.1 6.0 1.5 Coronation Conversion
DDH8336 165.9 168.9 3.0 2.8 Coronation Conversion
DDH8367 193.5 199.5 6.0 1.7 Coronation Extension
DDH8367 206.5 210.5 4.0 1.8 Coronation Extension
RCH8390 88.0 96.0 8.0 0.8 Coronation Conversion
DDH8145 271.0 278.0 7.0 3.1 GPUG Extension
DDH8170 174.1 188.1 14.0 4.0 GPUG Conversion
DDH8269 167.0 194.0 27.0 3.0 GPUG Conversion
DDH8281 447.4 459.4 12.0 2.1 GPUG Extension
DDH8294 365.8 376.8 11.0 3.9 GPUG Conversion
DDH8302 368.8 384.8 16.0 2.4 GPUG Conversion
DDH8325 378.0 387.0 9.0 2.7 GPUG Conversion
DDH8407 339.7 369.7 30.0 0.7 GPUG Extension
DDH8412 326.1 341.1 15.0 1.5 GPUG Extension
GDH0567 95.0 113.0 18.0 2.7 GPUG Extension
DDH8224 243.0 268.0 25.0 0.8 Innes Mills Conversion
DDH8241 289.5 298.5 9.0 4.2 Innes Mills Conversion
DDH8243 226.0 244.0 18.0 1.3 Innes Mills Conversion
DDH8252 216.2 235.5 19.3 1.7 Innes Mills Conversion
DDH8255 299.0 307.5 8.5 2.0 Innes Mills Conversion
DDH8255 239.0 248.0 9.0 1.8 Innes Mills Conversion
DDH8262 273.0 288.0 15.0 2.6 Innes Mills Conversion
DDH8369 117.8 126.8 9.0 2.2 Innes Mills Conversion
RCD8297 252.1 270.1 18.0 0.9 Innes Mills Conversion
RCH8250 69.0 93.0 24.0 0.8 Innes Mills Conversion
1 Table 1 highlights the 10 best selected significant intercepts at Macraes, by deposit. A complete list of drill holes is
available on the Company’s website: https://www.oceanagold.com/. To meet the criteria of a significant intercept for this
table, composites are at least 2.0 m long and the cut-off of waste to ore is 0.25 g/t Au. Each composite interval is allowed
to contain a maximum of 5.1 m of waste at a maximum consecutive length of 4.1 m of waste. Intervals that meet these
criteria and have a minimum grade of 0.7 g/t Au are classed as significant intercepts.