NOTICE OF ANNUAL GENERAL MEETING

Notice to ASX
6 May 2026

Please find attached the Notice of Annual General Meeting for Bougainville
Copper Limited (ASX: BOC) along with explanatory notes and proxy forms.

This notice reconfirms the Annual General meeting details are:

Date: Thursday 21st May 2026
Time: 1.30 pm (Port Moresby time & AEST)

Bougainville Copper will be providing the following Meeting choices:

Physical Venue: Grand Papua Hotel, Mary Street, Port
Moresby, Papua New Guinea

Virtual Attendance live webcast: https://meetnow.global/MKM4APX

Please refer to the attached meeting documents for additional information.

The notice of meeting, proxy form and explanatory notes will be emailed and mailed
to shareholders on the 7th May 2026.

The annual report will be available 11th May 2026 on the company website
www.bcl.com.pg/results-reports/. If you elected to receive a paper copy of the
annual report, it will be mailed to you.

Authorised by the Board
Mark Hitchcock
Company Secretary

View the Notice to ASX here