Commenced Drilling in Kazakhstan East Region

17 June 2025

East Star Resources Plc

("East Star" or the "Company")

Commenced Drilling in Kazakhstan East Region

East Star Resources Plc (LSE:EST), which is exploring for copper and gold in Kazakhstan, is pleased to announce the commencement of drilling at the first of two high priority VMS copper targets in East Kazakhstan.

The first drill hole at Rulikha is targeting the northern most IP anomaly (in the approximately 1,550m west to east and 1,040m north to south anomaly) immediately north of the Rulikha Deposit. The anomaly starts from approximately 100m below surface and is open at depth.

Upon completion of drilling at Rulikha, the rig will move to the Talovskoye target.

Alex Walker, East Star CEO, commented:

"The preparation work has been done. We're now ready to find out if the Rulikha Deposit continues to the north, creating another significant deposit in the East Region. If successful, new discoveries will help with underutilised regional infrastructure and falling employment due to mine life depletion in this proud mining region of the world." 

VMS: Volcanogenic massive sulphide

IP: Induced polarisation

East Star Resources Plc

Alex Walker, Chief Executive Officer

Tel: +44 (0)20 7390 0234 (via Vigo Consulting)

SI Capital (Corporate Broker)

Nick Emerson

Tel: +44 (0)1483 413 500

Vigo Consulting (Investor Relations)

Ben Simons / Peter Jacob

Tel: +44 (0)20 7390 0234

About East Star Resources Plc

East Star Resources is focused on the discovery and development of copper and gold in Kazakhstan. East Star's management are based permanently on the ground, supported by local expertise. The Company is pursuing three exploration strategies:

·    Volcanogenic massive sulphide (VMS) exploration, which to date includes a deposit with a maiden JORC MRE of 20.3Mt @ 1.16% copper, 1.54% zinc and 0.27% lead, in an infrastructure-rich region, amenable to a low capex development

·    Copper porphyry and epithermal gold exploration, with multiple opportunities for Tier 1 deposits, initially supported by an initial US$500k grant from BHP Xplor in 2024

·    Sediment-hosted copper exploration with Getech where the initial targeting strategy is at no cost to East Star.

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www.eaststarplc.com

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The person who arranged for the release of this announcement was Alex Walker, CEO of the Company.

This announcement contains inside information for the purposes of Article 7 of Regulation 2014/596/EU which is part of domestic UK law pursuant to the Market Abuse (Amendment) (EU Exit) Regulations (SI 2019/310) ("UK MAR"). Upon the publication of this announcement, this inside information (as defined in UK MAR) is now considered to be in the public domain.