OceanaGold Provides Notice of Third Quarter Results and Conference Call

October 6, 2023 News Release

OceanaGold Provides Notice of Third Quarter Results and Conference Call

(VANCOUVER, B.C.) OceanaGold Corporation (TSX:OGC, OTCQX:OCANF) (“OceanaGold” or the “Company”) will release its operational and financial results for the quarter ending September 30, 2023, after market close on Wednesday October 25th, 2023. The results will be made available on the Company’s website at www.oceanagold.com.

Senior management will host a conference call / webcast to discuss the results on Thursday October 26th, 2023, at 9:00 am Eastern Time.

Webcast Details:

To register, please copy and paste the link into your browser: https://app.webinar.net/RGB2oWGoZV9

Conference Call Details:

Toll-free North America: +1 888-390-0546 Toronto and International: +1 416-764-8688

If you are unable to attend the call, a recording will be made available on the Company’s website.

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; Didipio Mine in the Philippines; and the Macraes and Waihi operations in New Zealand.

For further information please contact:

Investor Relations:

Rebecca Harris, Director, Investor Relations Tel: +1 604-678-4095 [email protected]

Media Relations:

Melissa Bowerman, Group Manager, Communications Tel: +61 730 740 509 [email protected] www.oceanagold.com | Twitter: @OceanaGold