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Oceanagold Reports Exploration Results at Haile

Drill Results

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MEDIA RELEASE

16 August 2018

OCEANAGOLD REPORTS EXPLORATION RESULTS AT HAILE

(MELBOURNE) OceanaGold Corporation (TSX: OGC) (ASX: OGC) (the “Company”) is pleased to announce

an update on exploration activity at the Company’s Haile gold mine in South Carolina, U.S.A. This exploration

update follows the update p rovided to the market on 8 November 2017 (“November update”) and results

herein reflect activity completed after this date.

Selection of significant drill results within and/or adjacent to pit designs

• 46.6 metres @ 4.93 g/t between Ledbetter and Snake

• 32.3 metres @ 10.14 g/t at Mill Zone

• 77.7 metres @ 4.04 g/t at upper Ledbetter

• 21.3 metres @ 4.51 g/t at Red Hill

• 45.1 metres @ 1.17 g/t between Mill Zone and Mustang

Mick Wilkes, President and CEO of OceanaGold said, “ I am very pleased to announce the results of

brownfields drilling at Haile over the past nine months that are expected to add more low-cost ounces to our

reserves. These results demonstrate the potential for additional mineralisation close to surface between

current pit designs and at depth. Comprehensive geological reassessment from mapp ing and core logging

has identified important structural controls that are being applied to our 3D models which will play a critical

role in ongoing and future target generation. Haile’s exploration team is also driving innovative modelling for

emerging geophysical targets that will be pursued in 2019.”

“Since acquiring the Haile Gold Mine in late 2015, we have delivered a 70% increase in reserves and, through

our exploration program, we continue to learn more about the genesis of the mineralisation. Thro ugh this

greater understanding, we are improving our mine planning and design which fits well with our continued

focus on improving productivities and reducing costs.”

“In addition to exploration, the Company continues to advance the expansion of the proce ss plant with the

pebble crusher now fully constructed and commissioned. The Tower and Isa Mills, critical processing

equipment for the expansion and recovery enhancement, are scheduled for completion in the first quarter of

2019.”

Since the last explorat ion update on November 8, 2017, the Company has drilled 100 drill holes for a

combined 26,149 metres at Haile using four surface diamond drills. Resource infill and extension drilling has

targeted low-cost reserve growth areas in and around the Ledbetter, Mustang, Mill Zone , Snake, Red Hill,

and Haile deposits (Figure 1).

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Favourable extension drill results are expected to add ore-grade mineralisation between pit designs at low

strip ratios (Table 1). Pit designs will likely be merged between the Mill Zone/Mustang (e.g. DDH0715: 45.1m

@ 1.17 g/t from 9 1.9m) and Ledbetter/Snake pit designs (e.g. DDH0669: 46.6m @ 4.93 g/t from 243.8 m).

Drilling below the northwest wall of the Mill Zone Phase 1 pit returned positive results and a Phase 2 layback

design is in progress (e.g. DDH0736: 32.3m @ 10.14 g/t from 59.6m).

Infill and delineation drilling continue to support our models and robust mineralisation, notably in the upper

Ledbetter area (e.g. DDH0678: 77.7m @ 4.04 g/t from 173.2m and DDH0771: 75.9m @ 1.57 g/t from 203.1m)

(Figures 1 & 2). Shallow, medium -grade drill intercepts have been confirmed in diamond holes a t Red Hill

which is scheduled for mining in 2019 (e.g. DDH0805: 21.3m @ 4.51 g/t from 54.0m) (Figure 1). An 18-hole

diamond drill program was conduct ed outside the reserve pit design at the Snake West extension and

returned positive results (e.g. DDH0755: 64.8m @ 0.97 g/t from 198m) (Figures 3 and 4). Further drilling is

planned in the second half of 2018 at Ledbetter, Mill Zone and Snake.

Assays received from delineation drilling continue to validate high-grade, continuous mineralisation at the

Horseshoe underground deposit (e.g. DDH0609: 233.5m @ 2.87 g/t from 168.6m).

Figure 1 – Selected Drill Holes and Significant Intercepts (November 2017 to July 2018)

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Figure 2 – Cross Section A-A’ With Drill Hole and Assay Results

Figure 3 – Map of the 18-Hole Snake West Drill Program

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Figure 4 – Cross Section B-B’ With Snake West Drill Hole and Assay Results

Table 1 – Significant Drill Hole Intercepts from November 2017 To July 2018

Drill Hole ID

East

NAD83Z17N

(m)

North

NAD83Z17N

(m)

Collar RL

(m) Az Dip From

(m)

To

(m)

Width

(m)

Gold

Grade

(g/t)

Project

DDH0763 542037 3826320 126 219 -40 49.3 99.2 49.9 0.77 Haile

DDH0765 542037 3826320 126 145 -45 35.5 58.2 22.7 1.99 Haile

DDH0609 543593 3826925 154 0 -90 168.5 402.0 233.5 2.87 Horseshoe

DDH0611 543535 3827016 159 180 -76 405.1 427.1 22.0 1.76 Horseshoe

DDH0666 542779 3826865 140 126 -62 218.1 233.3 15.2 3.75 Ledbetter

DDH0672 542779 3826865 140 149 -63 120.8 139.1 18.3 2.00 Ledbetter

DDH0678 542585 3826899 147 172 -54 173.2 250.9 77.7 4.04 Ledbetter

DDH0744 542744 3826842 140 159 -50 144.0 185.1 41.2 1.16 Ledbetter

DDH0744 542744 3826842 140 159 -50 209.5 244.5 35.1 1.13 Ledbetter

DDH0747 542744 3826842 140 30 -85 222.0 239.6 17.6 2.86 Ledbetter

DDH0749A 542402 3826829 150 193 -71 252.3 275.2 22.9 3.14 Ledbetter

DDH0749A 542402 3826829 150 193 -71 287.0 321.8 34.8 0.97 Ledbetter

DDH0752 542520 3826856 143 165 -65 105.9 142.7 36.8 3.25 Ledbetter

DDH0756 542542 3827061 156 145 -57 196.8 213.5 16.7 7.26 Ledbetter

DDH0756 542542 3827061 156 145 -57 264.6 342.6 78.0 1.57 Ledbetter

DDH0758 542542 3827061 156 157 -56 274.3 332.6 58.3 1.54 Ledbetter

DDH0771 542676 3826926 152 132 -79 203.1 279.0 75.9 1.57 Ledbetter

DDH0786 542822 3826854 138 141 -74 207.3 221.5 14.2 5.40 Ledbetter

DDH0787 542638 3827052 155 133 -74 270.1 306.6 36.6 0.89 Ledbetter

DDH0703 541546 3826703 157 155 -48 275.3 283.3 8.0 12.11 Mill Zone

DDH0704 541427 3826258 147 99 -48 144.5 170.2 25.7 1.06 Mill Zone

DDH0710 541569 3826674 156 164 -40 263.7 277.4 13.7 5.84 Mill Zone

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Drill Hole ID

East

NAD83Z17N

(m)

North

NAD83Z17N

(m)

Collar RL

(m) Az Dip From

(m)

To

(m)

Width

(m)

Gold

Grade

(g/t)

Project

DDH0715 541948 3826788 147 179 -47 91.9 137.0 45.1 1.17 Mill Zone

DDH0723 541569 3826674 156 157 -48 257.0 264.5 7.6 3.39 Mill Zone

DDH0725 541352 3826432 155 125 -57 221.7 230.6 8.9 3.44 Mill Zone

DDH0729 541730 3826453 60 0 -90 0.6 41.7 41.1 2.00 Mill Zone

DDH0731 541696 3826458 60 336 -68 7.8 70.8 63.0 4.37 Mill Zone

DDH0732 541652 3826398 60 317 -45 5.8 29.2 23.4 4.49 Mill Zone

DDH0743 541345 3826412 155 105 -40 234.6 251.4 16.8 2.05 Mill Zone

DDH0743 541345 3826412 155 105 -40 257.5 295.6 38.1 1.61 Mill Zone

DDH0762 541474 3826587 155 134 -40 249.2 267.8 18.6 5.39 Mill Zone

DDH0730 541419 3826550 154 115 -40 255.9 271.1 15.2 4.20 Mill Zone

DDH0736 541681 3826430 60 314 -55 59.6 91.9 32.3 10.14 Mill Zone

DDH0739 541625 3826321 60 275 -44 26.0 40.6 14.6 5.01 Mill Zone

DDH0751 541984 3826480 132 322 -77 71.8 86.4 14.6 1.98 Mill Zone

DDH0751 541984 3826480 132 322 -77 117.8 151.3 33.5 0.78 Mill Zone

DDH0669 542779 3826865 140 109 -54 243.8 290.5 46.6 4.93 Mustang

DDH0674 542779 3826865 139 204 -82 224.8 235.3 10.5 4.06 Mustang

DDH0716 542387 3826937 153 159 -70 253.4 297.7 44.3 1.14 Mustang

DDH0717 542553 3827097 155 121 -61 293.0 334.2 41.2 0.81 Mustang

DDH0803 542602 3826262 145 0 -90 26.5 63.1 36.6 2.33 Red Hill

DDH0805 542579 3826276 145 0 -90 54.0 75.3 21.3 4.51 Red Hill

DDH0806 542659 3826278 145 0 -90 59.0 70.7 11.8 2.60 Red Hill

DDH0807 542626 3826263 151 0 -90 41.6 55.2 13.6 4.60 Red Hill

DDH0792 543041 3826690 111 165 -50 193.4 204.3 10.9 2.32 Snake

DDH0742 542953 3826934 139 142 -56 234.5 249.0 14.5 1.89 Snake Pit

DDH0746 543148 3826726 131 164 -65 88.8 116.9 28.1 4.43 Snake Pit

DDH0773 543117 3826572 120 150 -71 63.3 84.6 21.3 1.19 Snake Pit

DDH0685 542758 3826647 137 163 -67 268.1 323.7 55.6 1.04 Snake West

DDH0693 542870 3826712 141 120 -57 143.0 161.9 18.9 10.95 Snake West

DDH0698 542871 3826675 143 100 -84 305.7 362.8 57.1 0.81 Snake West

DDH0698 542871 3826675 143 100 -84 55.6 67.7 12.1 2.41 Snake West

DDH0705 542871 3826675 143 139 -64 247.3 305.2 57.9 0.82 Snake West

DDH0720 542821 3826543 144 143 -60 228.4 267.0 38.6 1.43 Snake West

DDH0726 542851 3826578 145 133 -53 244.1 273.0 29.0 1.03 Snake West

DDH0726 542851 3826578 145 133 -53 73.3 144.9 71.6 0.51 Snake West

DDH0728 542851 3826578 145 144 -65 239.0 260.7 21.7 1.07 Snake West

DDH0733 542890 3826424 156 99 -78 147.6 172.7 25.1 1.36 Snake West

DDH0741 542758 3826647 137 143 -68 317.5 353.2 35.7 0.74 Snake West

DDH0755 542758 3826647 137 163 -67 198.0 262.8 64.8 0.97 Snake West

DDH0759 542809 3826648 139 119 -65 230.2 305.4 75.2 0.89 Snake West

DDH0760 542837 3826519 147 134 -58 175.8 178.2 2.4 11.91 Snake West

DDH0760 542837 3826519 147 134 -58 203.1 227.8 24.7 1.03 Snake West

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All drill hole data and additional information in relation to the Haile Gold Mine can be found on the Company’s

website at http://www.oceanagold.com/investor-centre/filings/. In line with ASX listing requirements,

OceanaGold has appended the information required by JORC Table 1 for Haile Exploration Results to it s

ASX announcement. JORC Table 1 is not required under National Instrument 43 -101. Readers are referred

to the ASX website at www.asx.com.au or the OceanaGold website at www.oceanagold.com to view JORC

Table 1.

- ENDS -

For further information please contact:

Investor Relations Media Relations

Sam Pazuki

Tel: +1 416 915 3123

Melissa Bowerman

Tel: +61 405 900 099

Jeffrey Sansom

Tel: +61 3 9656 5300

[email protected] [email protected]

www.oceanagold.com | Twitter: @OceanaGold

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 identif y and invest in social programs that are

designed to build capacity and not dependency.

In 2018, the Company expects to produce 500,000 to 540,000 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 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

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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 Haile exploration results in this document has been verified by, is based on and fairly

represents information compiled by or prepared under the supervision of John Jory, a Certified Professional

Geologist and Member of the American Institute of Professional Geologists and an employee of OceanaGold.

Mr Jory 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 purpos es of the NI 43 101. Mr Jory 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, exe cution 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 anticipa te", "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 re serve 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.

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