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OceanaGold intersects significant high-grade mineralisation on Martha and Empire veins at Waihi

Drill Results

OceanaGold intersects significant high-grade

mineralisation on Martha and Empire veins at

Waihi

/NOT FOR DISSEMINATION OR DISTRIBUTION IN

THE UNITED STATES

AND NOT FOR

DISTRIBUTION TO US NEWSWIRE SERVICES./

MELBOURNE

,

June 11, 2018

/CNW/ - OceanaGold Corporation (

TSX: OGC) (ASX: OGC

) (the

"Company") is pleased to announce the intersection of high-grade mineralisation along two large

veins (Martha and Empire) beneath the Martha Pit at Waihi in

New Zealand

. These results stem

from the latest round of drilling from two drill drives beneath the Martha pit and form part of a more

extensive ongoing exploration program that includes surface and underground drilling.

Selection of Significant Intercepts

Empire Vein

5.0 metres @ 65.3 g/t Au, 100 g/t Ag

9.0 metres @ 29.4 g/t Au, 288 g/t Ag

3.6 metres @ 31.9 g/t Au, 447 g/t Ag

3.5 metres @ 24.2 g/t Au, 105 g/t Ag

Martha Vein

42.0 metres* @ 7.1 g/t Au, 46 g/t Ag

4.4 metres @ 19.8 g/t Au, 30 g/t Ag

10.5 metres @ 8.6 g/t Au, 18 g/t Ag

11.7 metres @ 7.1 g/t Au, 14 g/t Ag

Mick Wilkes

, President and CEO of OceanaGold said, "The latest drill results further demonstrates

the significant mineralisation that resides beneath the Martha Pit. These results are from a drill

program that form only a subset of a much more extensive drill program along kilometres of

combined strike and hundreds of metres of vertical vein extent. The exploration program is designed

to unlock the million-ounce resource target at Waihi which we expect would sustain current mining

operations out to 2030 at historical production levels."

He added, "Over the course of the next 18 months, we will continue with our drill programs and

expect to make periodic updates to Waihi's mineral resource throughout this period. Our strategy is

to own and operate high-margin, long-life assets and the Martha Project aligns well with this strategy

as we expect it can deliver significant value for shareholders and benefits local stakeholders at

Waihi."

On

March 28, 2018

, the Company announced the Martha Project which comprises an underground

mine ("the Martha Underground Mine") and the recommencement of open pit mining operations from

Phase 4 of the Martha Pit. Consent applications were subsequently lodged

May 25, 2018

.

Figure 1 – Oblique View to SW Across Waihi Mines and Targets (CNW Group/OceanaGold

Corporation)

Since the

November 2017

update, drilling at the Martha Project has focussed on resource

development from two underground drill drives utilising up to four drill rigs. Over the course of the

coming 12 months more than 47,000 metres alone will be drilled from both underground and surface

on this project.

Drilling continues from drill drives that are being extended from the current underground mine

approximately 900 metres on two levels under the Martha open pit (Figure 1, 920DD, 800DD).

Drilling with up to four diamond rigs is testing the Martha, Empire, Royal and Edward veins with a

known combined strike extent of 3,200 metres over a 500-metre vertical range. This latest drilling

exceeds expectations and includes; 5.0 metres at 65.3 g/t gold; 9.0 metres at 29.4 g/t gold; 3.6

metres at 31.9 g/t gold and 7.9 metres at 14.1 g/t gold (Figures 2 and 3, Appendix A). These recent

intersections represent structures of similar widths and grades to those that have been historically

mined from the underground (Figures 2 and 3). In addition, a large number of mineralised veins have

been intersected around the Empire and Martha veins, outside of the targeted shapes, that will

contribute to the updated model.

The exploration target within the Martha Underground (Figure 1) is expected to yield tonnages of

between 3.5 million and 5.0 million tonnes and grades ranging between 5.0 g/t and 7.0 g/t gold for

500,000 to 700,000 ounces of gold. This exploration target is conceptual in nature and was

generated from an assessment of surface and underground drilling data collected by the Company

as well as historical and archived geological and mining data from over a century of mining activity at

Waihi. It is anticipated that the permitting process for the Martha Project will be completed by the

end of 2019, with resource potential to allow continuity of mining operations at Waihi to at least

2030.

Drilling from the two underground drill drives are expected to continue for the remainder of the year

in conjunction with other drill programs at Waihi and regionally.

Figure 2 – Plan View Across the Martha Underground Drill Targets (CNW Group/OceanaGold

Corporation)

Figure 3 – Cross Section Across the Martha Underground Drill Targets (CNW Group/OceanaGold

Corporation)

All drill data including the JORC Code Table 1 for the Waihi exploration results can be found on the

Company's website at

http://www.oceanagold.com

About OceanaGold

OceanaGold Corporation is a mid-tier, high-margin, multinational gold producer with assets located

in

the Philippines

,

New Zealand

and

the United States

. The Company's assets encompass the

Didipio Gold-Copper Mine located on the island of Luzon in

the Philippines

. On the North Island of

New Zealand

, the Company operates the high-grade Waihi Gold Mine while on the South Island of

New Zealand

, the Company operates the largest gold mine in the country at the Macraes Goldfield

which is made up of a series of open pit mines and the Frasers underground mine. In

the United

States

, the Company operates the Haile Gold Mine, a top-tier, long-life, high-margin asset located in

South Carolina

. OceanaGold also has a significant pipeline of organic growth and exploration

opportunities in the Americas and

Asia-Pacific

regions.

OceanaGold has operated sustainably over the past 27 years with a proven track-record for

environmental management and community and social engagement. The Company has a strong

social license to operate and works collaboratively with its valued stakeholders to identify and invest

in social programs that are designed to build capacity and not dependency.

In 2018, the Company expects to produce 480,000 to 530,000 ounces of gold and 15,000 to 16,000

tonnes of copper with All-In Sustaining Costs that range from

$725

to

$775

per ounce sold.

Competent/Qualified Person's Statement

The resources and exploration results were prepared in accordance with the standards set out in the

2012 Edition of the 'Australasian Code for Reporting of Exploration Results, Mineral Resources and

Ore Reserves' ("JORC Code") and in accordance with National Instrument 43-101 – Standards of

Disclosure for Mineral Projects of the Canadian Securities Administrators ("NI 43-101"). The JORC

Code is the accepted reporting standard for the Australian Stock Exchange Limited ("ASX").

Information relating to Waihi exploration results in this document has been verified by, is based on

and fairly represents information compiled by or prepared under the supervision of Lorrance

Torckler, a Fellow of the Australasian Institute of Mining and Metallurgy and an employee of

OceanaGold. Mr Torckler 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 and is Qualified Persons for the purposes of the NI 43 101. Mr

Torckler consents to the inclusion in this public report of the matters based on their information in the

form and context in which it appears.

Cautionary Statement for Public Release

Certain information contained in this public release may be deemed "forward-looking" within the

meaning of applicable securities laws. 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 Corporation 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 statements and

information. They include, among others, the accuracy of mineral reserve and resource estimates

and related assumptions, inherent operating risks and 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.sedar.com

under the Company's name. There are no assurances the Company

can fulfil forward-looking statements and information. Such forward-looking statements and

information 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 and information 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 and information. 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. The

information contained in this release is not investment or financial product advice.

Appendix A: Waihi Exploration Drilling Results.

Table 1 – Significant Intersections from Incremental Waihi Resource Drilling

Drill Hole ID

East

#

(m)

North

#

(m)

Collar RL

(m)

Az

#

Dip

From

(m)

To

(m)

True width

(m)

Gold Grade

(g/t)

Silver Grade

(g/t)

Vein

801EN1147

396283.28

643362.71

808.03

308.02

1.6

52.40

58.00

5.5

8.55

16.4

Empire

912ER1115

396425.01

643297.03

913.95

298.43

-7.5

85.70

88.35

2.4

9.20

540.2

Empire

912ER1139

396429.06

643297.92

913.44

354.12

-31.0

99.50

104.80

5.1

6.54

6.1

Empire

# Old Mt Eden Coordinate system

Table 2 – Significant Intersections from Waihi Martha UG Resource Drilling

Drill Hole ID

East

#

(m)

North

#

(m)

Collar RL

(m)

Az

#

Dip

From

(m)

To

(m)

True width

(m)

Gold Grade

(g/t)

Silver Grade

(g/t)

Vein

800SP1MN1100

395967.24

643097.54

780.0

294.7

5.8

160.90

164.60

3.0

10.57

32.5

Empire

800SP1MN1100

395967.24

643097.54

780.0

294.7

5.8

160.90

162.60

1.5

21.74

67.6

Empire

800SP1MN1100

395967.24

643097.54

780.0

294.7

5.8

272.00

278.50

6.5 *

5.34

107.0

Martha HW

800SP1MN1100

395967.24

643097.54

780.0

294.7

5.8

284.80

289.30

3.6

19.14

123.1

Martha

800SP1MN1101

395967.33

643097.70

779.6

300.1

-3.2

120.45

124.85

2.8

14.13

9.4

Empire FW

800SP1MN1103

395967.42

643097.69

779.3

300.9

-14.9

141.00

150.00

5.2

4.30

4.0

Empire FW

800SP1MN1103

395967.42

643097.69

779.3

300.9

-14.9

204.40

217.70

10.5

8.60

17.6

Martha HW

800SP1MN1103

395967.42

643097.69

779.3

300.9

-14.9

210.90

214.60

2.5

15.41

22.6

Martha HW

800SP1MN1103

395967.42

643097.69

779.3

300.9

-14.9

226.10

232.60

6.5 *

6.60

22.0

Martha

800SP1MN1103

395967.42

643097.69

779.3

300.9

-14.9

229.60

232.60

3.0 *

9.68

34.8

Martha

800SP1MN1109

395967.18

643097.38

780.1

290.0

9.0

146.50

153.60

6.8

12.15

29.7

Empire

800SP1MN1109

395967.18

643097.38

780.1

290.0

9.0

148.00

153.20

4.9

16.23

39.7

Empire

800SP1MN1109

395967.18

643097.38

780.1

290.0

9.0

297.50

303.10

5.6 *

15.65

46.7

Martha HW

800SP1MN1109

395967.18

643097.38

780.1

290.0

9.0

313.00

355.20

42.2 *

7.05

45.9

Martha

800SP1MN1116

395967.29

643097.41

779.6

291.6

-1.0

125.90

131.20

3.8

12.12

34.5

Empire FW

800SP1MN1116

395967.29

643097.41

779.6

291.6

-1.0

125.90

126.25

0.3

154.00

503.0

Empire FW

800SP1MN1118

395967.33

643097.70

779.7

300.7

-0.1

160.60

168.00

6.4

14.98

95.3

Empire

800SP1MN1118

395967.33

643097.70

779.7

300.7

-0.1

177.00

182.00

5.0

65.26

100.0

Empire HW

800SP1MN1118

395967.33

643097.70

779.7

300.7

-0.1

256.60

257.60

0.5

23.76

72.5

Martha HW

800SP1MN1118

395967.33

643097.70

779.7

300.7

-0.1

261.60

267.00

5.4

10.74

156.1

Martha

800SP1MN1127

395967.15

643097.43

779.3

290.7

-14.1

138.40

139.00

0.5

50.90

31.5

Empire FW

800SP1MN1127

395967.15

643097.43

779.3

290.7

-14.1

175.00

186.60

6.3

4.82

11.2

Empire FW/Empire

800SP1MN1127

395967.15

643097.43

779.3

290.7

-14.1

184.30

185.40

1.1 *

20.55

27.9

Empire

800SP1MN1127

395967.15

643097.43

779.3

290.7

-14.1

221.20

227.90

5.5

6.32

9.7

Martha HW

800SP1MN1127

395967.15

643097.43

779.3

290.7

-14.1

237.90

239.60

0.9

12.37

17.5

Martha HW

800SP1MN1127

395967.15

643097.43

779.3

290.7

-14.1

249.20

261.00

9.4

4.56

16.7

Martha

800SP1MN1127

395967.15

643097.43

779.3

290.7

-14.1

265.00

271.70

6.2

5.10

8.0

Martha

800SP1MN1128

395967.32

643097.58

779.1

293.5

-25.5

215.90

231.20

11.7

7.09

14.2

Martha

800SP1MN1131

395967.02

643097.18

779.1

282.8

-22.0

295.10

305.90

5.4

4.45

6.2

Martha FW/No. 1

800SP1MN1133

395967.40

643097.21

779.6

287.0

-2.1

160.00

169.25

8.0

6.64

10.8

Empire

800SP1MN1133

395967.40

643097.21

779.6

287.0

-2.1

217.50

220.00

2.5 *

39.25

523.2

Martha HW

800SP1MN1133

395967.40

643097.21

779.6

287.0

-2.1

228.30

234.00

4.4

19.83

29.8

Martha HW

800SP2MN1097

395973.40

643107.73

780.1

313.7

-16.9

156.35

159.00

2.6

12.85

25.8

Empire

800SP2MN1097

395973.40

643107.73

780.1

313.7

-16.9

165.80

180.25

11.1

8.13

23.5

Empire HW

800SP2MN1097

395973.40

643107.73

780.1

313.7

-16.9

197.55

202.70

5.1

10.56

21.9

Martha HW

800SP2MN1099

395973.35

643107.80

779.9

310.5

-4.7

165.20

169.10

3.3

20.88

25.1

Empire HW

800SP2MN1106

395973.36

643107.58

779.2

305.7

-29.0

156.10

158.60

1.6

9.13

8.6

Empire

800SP2MN1108

395973.47

643108.13

780.3

318.5

6.3

194.10

196.30

2.1

14.40

207.8

Martha HW

800SP2MN1114

395973.91

643108.52

780.5

332.4

9.4

160.40

164.00

2.8

14.83

88.2

Empire FW

800SP2MN1114

395973.91

643108.52

780.5

332.4

9.4

138.30

141.20

2.3

12.00

20.2

Empire HW

800SP2MN1117

395973.68

643108.12

779.9

324.3

-4.1

135.80

145.25

6.4

7.11

9.5

Empire

800SP2MN1121

395973.79

643108.40

779.4

329.1

-16.6

177.70

180.00

1.8

10.93

16.9

Martha HW

800SP2MN1129

395974.41

643108.69

780.2

345.1

4.5

131.55

132.70

1.0

55.90

218.0

Empire

800SP2MN1129

395974.41

643108.69

780.2

345.1

4.5

140.80

150.45

7.9

14.10

297.6

Empire HW

800SP2MN1129

395974.41

643108.69

780.2

345.1

4.5

241.95

246.70

4.1

7.99

118.2

Martha

800SP2MN1130

395974.17

643108.53

780.0

338.7

-0.9

126.20

126.80

0.5

216.00

150.0

Empire FW

800SP2MN1130

395974.17

643108.53

780.0

338.7

-0.9

129.80

132.15

2.0

8.53

8.2

Empire

800SP2MN1130

395974.17

643108.53

780.0

338.7

-0.9

129.80

140.65

9.0

29.35

288.0

Empire

800SP2MN1130

395974.17

643108.53

780.0

338.7

-0.9

153.80

159.10

4.1

9.03

158.9

Empire HW

800SP2MN1134

395974.43

643108.78

779.3

346.3

-19.0

151.60

154.30

2.6

11.39

15.7

Empire HW

800SP3MN1126

395989.71

643115.40

779.9

350.9

-1.0

168.40

172.60

3.6

31.93

447.1

Empire HW

800SP3MN1132

395989.94

643115.33

779.5

356.0

-14.9

174.70

183.65

7.3

6.01

12.8

Empire

800SP3MN1132

395989.94

643115.33

779.5

356.0

-14.9

185.70

188.60

2.5

10.84

12.9

Empire HW

800SP3MN1132

395989.94

643115.33

779.5

356.0

-14.9

208.00

212.35

3.4

5.12

4.6

Martha HW

920SP2MN1151

396155.34

643097.15

922.0

334.0

-20.8

241.50

244.20

1.7

15.64

28.9

Empire

920SP2MN1151

396155.34

643097.15

922.0

334.0

-20.8

229.10

230.30

0.6

51.65

1225.0

Empire FW

920SP2MN1151

396155.34

643097.15

922.0

334.0

-20.8

240.60

245.80

3.5

24.23

105.0

Empire

920SP3MN1146

396038.34

643058.12

921.5

338.5

-11.2

340.00

342.70

1.5

7.52

89.4

Martha

920SP4MN1152

395924.89

643020.59

919.7

350.3

-23.8

182.70

185.00

1.7

15.73

47.4

Empire FW

UW654

395276.30

642735.05

1128.1

39.9

-37.6

69.70

72.70

3.0 *

14.42

75.1

Edward HW

#

Old Mt Eden Coordinate system

* Downhole length as not possible to determine true width

SOURCE

OceanaGold Corporation

View original content with multimedia:

http://www.newswire.ca/en/releases/archive/June2018/11/c2009.html

%SEDAR: 00025328E

For further information:

Investor Relations: Sam Pazuki, Tel: +1 416 915 3123; Jeffrey Sansom,

Tel: +61 3 9656 5300, [email protected]; Media Relations: Melissa Bowerman, Tel: +61 3 9656

5300, [email protected], www.oceanagold.com, Twitter: @OceanaGold

CO: OceanaGold Corporation

CNW 05:00e 11-JUN-18